Updated on 2026/09/23

写真a

 
MATSUMOTO RYO
 
Organization
School of Science Assistant Professor
Title
Assistant Professor
External link

Papers

  • Search for Diffuse Supernova Neutrino Background with 956.2 Days of Super-Kamiokande Gadolinium Dataset

    K. Abe, S. Abe, Y. Asaoka, M. Harada, Y. Hayato, K. Hiraide, K. Hosokawa, T. H. Hung, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, M. Nakahata, S. Nakayama, Y. Noguchi, G. Pronost, K. Sato, H. Sekiya, R. Shinoda, M. Shiozawa, Y. Suzuki, A. Takeda, Y. Takemoto, H. Tanaka, T. Yano, Y. Itow, T. Kajita, R. Nishijima, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, P. Fernandez, L. Labarga, D. Samudio, B. Zaldivar, C. Yanagisawa, E. Kearns, J. Mirabito, L. Wan, T. Wester, B. W. Pointon, J. Bian, B. Cortez, N. J. Griskevich, Y. Jiang, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, M. C. Jang, S. H. Lee, D. H. Moon, R. G. Park, B. S. Yang, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, E. Le Blévec, O. Drapier, A. Ershova, M. Ferey, Th. A. Mueller, A. D. Santos, P. Paganini, C. Quach, R. Rogly, T. Nakamura, J. S. Jang, R. P. Litchfield, L. N. Machado, F. J. P. Soler, J. G. Learned, K. Choi, S. Cao, L. H. V. Anthony, N. W. Prouse, M. Scott, Y. Uchida, V. Berardi, N. F. Calabria, M. G. Catanesi, N. Ospina, E. Radicioni, A. Langella, G. De Rosa, G. Collazuol, M. Feltre, M. Mattiazzi, L. Ludovici, M. Gonin, L. Périssé, B. Quilain, S. Horiuchi, A. Kawabata, M. Kobayashi, Y. M. Liu, Y. Maekawa, Y. Nishimura, R. Akutsu, M. Friend, T. Hasegawa, Y. Hino, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, Y. Oyama, A. Portocarrero Yrey, K. Sakashita, T. Sekiguchi, T. Tsukamoto, N. Bhuiyan, G. T. Burton, F. Di Lodovico, J. Gao, T. Katori, R. Kralik, N. Latham, R. M. Ramsden, H. Ito, T. Sone, A. T. Suzuki, Y. Takeuchi, S. Wada, H. Zhong, J. Feng, L. Feng, S. Han, J. Hikida, J. R. Hu, Z. Hu, M. Kawaue, T. Kikawa, T. Nakaya, T. V. Ngoc, R. A. Wendell, S. J. Jenkins, N. McCauley, A. Tarrant, M. Fanì, M. J. Wilking, Z. Xie, Y. Fukuda, H. Menjo, Y. Yoshioka, J. Lagoda, M. Mandal, J. Zalipska, M. Mori, J. Jiang, K. Hamaguchi, H. Ishino, Y. Koshio, F. Nakanishi, T. Tada, T. Ishizuka, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, S. Jung, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, T. Peacock, P. Stowell, M. D. Thiesse, L. F. Thompson, H. Okazawa, S. M. Lakshmi, E. Kwon, M. W. Lee, J. W. Seo, I. Yu, Y. Ashida, A. K. Ichikawa, K. D. Nakamura, S. Goto, H. Hayasaki, S. Kodama, Y. Kong, Y. Masaki, Y. Mizuno, T. Muro, K. Nakagiri, Y. Nakajima, N. Taniuchi, M. Yokoyama, P. de Perio, S. Fujita, C. Jesús-Valls, K. Martens, Ll. Marti, K. M. Tsui, M. R. Vagins, J. Xia, M. Kuze, S. Izumiyama, R. Matsumoto, R. Asaka, M. Ishitsuka, M. Sugo, M. Wako, K. Yamauchi, Y. Nakano, F. Cormier, R. Gaur, M. Hartz, A. Konaka, X. Li, B. R. Smithers, S. Chen, Y. Wu, B. D. Xu, A. Q. Zhang, B. Zhang, H. Adhikary, M. Girgus, P. Govindaraj, M. Posiadala-Zezula, Y. S. Prabhu, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, C. Bronner, D. Horiguchi, A. Minamino, Y. Sasaki, R. Shibayama, R. Shimamura

    The Astrophysical Journal   1005 ( 1 )   101 - 101   2026.6

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    Publishing type:Research paper (scientific journal)   Publisher:American Astronomical Society  

    Abstract

    We report the search result for the Diffuse Supernova Neutrino Background (DSNB) in neutrino energies beyond 9.3 MeV in the gadolinium-loaded Super-Kamiokande (SK) detector with a 22,500 × 956.2 m 3 day exposure. Starting in the summer of 2020, SK introduced 0.01% gadolinium (Gd) by mass into its ultrapure water to enhance the neutron capture signal, termed the SK-VI phase. This was followed by a 0.03% Gd-loading in 2022, a phase referred to as SK-VII. We then conducted a DSNB search using 552.2 days of SK-VI data and 404.0 days of SK-VII data through 2023 September. This analysis includes several new features, such as two new machine learning neutron detection algorithms with Gd, an improved atmospheric background-reduction technique, and two parallel statistical approaches. No significant excess over background predictions was found in a DSNB spectrum-independent analysis, and 90% confidence level (C.L.) upper limits on the astrophysical electron antineutrino flux were set. Additionally, a spectral fitting result exhibited a ∼1.2 σ disagreement with a null DSNB hypothesis, comparable to a previous result from 5823 days of all SK pure-water phases.

    DOI: 10.3847/1538-4357/ae6c20

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    Other Link: https://iopscience.iop.org/article/10.3847/1538-4357/ae6c20/pdf

  • Measurement of the solar neutrino interaction rate below 3.49 MeV in Super-Kamiokande-IV

    A. Yankelevich, K. Abe, Y. Asaoka, M. Harada, Y. Hayato, K. Hiraide, T. H. Hung, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, K. Nakagiri, M. Nakahata, S. Nakayama, Y. Noguchi, G. Pronost, K. Sato, H. Sekiya, R. Shinoda, M. Shiozawa, Y. Suzuki, A. Takeda, Y. Takemoto, H. Tanaka, T. Yano, S. Chen, Y. Itow, T. Kajita, R. Nishijima, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, F. J. de Garay Arcones, P. Fernandez, L. Labarga, D. Samudio, B. Zaldivar, C. Yanagisawa, B. Jargowsky, E. Kearns, J. Mirabito, L. Wan, T. Wester, B. W. Pointon, J. Bian, B. Cortez, N. J. Griskevich, Y. Jiang, M. B. Smy, H. W. Sobel, V. Takhistov, J. Hill, M. C. Jang, S. H. Lee, D. H. Moon, R. G. Park, B. S. Yang, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, O. Drapier, A. Ershova, M. Ferey, E. Le Blévec, Th. A. Mueller, P. Paganini, C. Quach, R. Rogly, T. Nakamura, J. S. Jang, R. P. Litchfield, L. N. Machado, F. J. P. Soler, J. G. Learned, K. Choi, S. Cao, L. H. V. Anthony, N. W. Prouse, M. Scott, Y. Uchida, V. Berardi, N. F. Calabria, M. G. Catanesi, N. Ospina, E. Radicioni, A. Langella, G. De Rosa, G. Collazuol, M. Feltre, M. Mattiazzi, L. Ludovici, M. Gonin, L. Périssé, B. Quilain, S. Horiuchi, A. Kawabata, M. Kobayashi, Y. M. Liu, Y. Maekawa, Y. Nishimura, R. Akutsu, M. Friend, T. Hasegawa, Y. Hino, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, Y. Oyama, A. Portocarrero Yrey, K. Sakashita, T. Sekiguchi, T. Tsukamoto, N. Bhuiyan, G. T. Burton, F. Di Lodovico, J. Gao, T. Katori, R. Kralik, N. Latham, R. M. Ramsden, V. Siccardi, H. Ito, T. Sone, A. T. Suzuki, Y. Takeuchi, S. Wada, H. Zhong, J. Feng, L. Feng, S. Han, J. Hikida, J. R. Hu, Z. Hu, M. Kawaue, T. Kikawa, T. V. Ngoc, T. Nakaya, R. A. Wendell, S. J. Jenkins, N. McCauley, A. Tarrant, M. Fanì, M. J. Wilking, Z. Xie, Y. Fukuda, H. Menjo, Y. Yoshioka, J. Lagoda, M. Mandal, Y. S. Prabhu, J. Zalipska, M. Mori, J. Jiang, K. Hamaguchi, H. Ishino, Y. Koshio, F. Nakanishi, T. Tada, T. Ishizuka, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, S. Jung, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, T. Peacock, P. Stowell, M. D. Thiesse, L. F. Thompson, H. Okazawa, S. M. Lakshmi, E. Kwon, M. W. Lee, J. W. Seo, I. Yu, Y. Ashida, A. K. Ichikawa, K. D. Nakamura, S. Abe, S. Goto, S. Kodama, Y. Kong, H. Hayasaki, Y. Masaki, Y. Mizuno, T. Muro, K. Nakagiri, Y. Nakajima, N. Taniuchi, M. Yokoyama, P. de Perio, S. Fujita, C. Jesús-Valls, K. Martens, Ll. Marti, A. D. Santos, K. M. Tsui, M. R. Vagins, J. Xia, S. Izumiyama, M. Kuze, R. Matsumoto, R. Asaka, M. Ishitsuka, M. Sugo, M. Wako, K. Yamauchi, Y. Nakano, F. Cormier, R. Gaur, M. Hartz, A. Konaka, X. Li, B. R. Smithers, S. Chen, Y. Wu, B. D. Xu, A. Q. Zhang, B. Zhang, H. Adhikary, M. Girgus, P. Govindaraj, M. Posiadala-Zezula, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, C. Bronner, D. Horiguchi, A. Minamino, Y. Sasaki, R. Shibayama, R. Shimamura

    Physical Review D   113 ( 11 )   2026.6

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    Super-Kamiokande (SK) has observed B 8 solar neutrino elastic scattering at recoil electron kinetic energies ( E kin ) as low as 3.49 MeV to study neutrino flavor conversion within the Sun. At SK-observable energies, these conversions are dominated by the Mikheyev-Smirnov-Wolfenstein effect. An upturn in the electron neutrino survival probability in which vacuum neutrino oscillations become dominant is predicted to occur at lower energies, but radioactive background increases exponentially with decreasing energy. New machine learning approaches provide substantial background reduction below 3.49 MeV such that statistical extraction of solar neutrino interactions becomes feasible. This article presents an analysis of the solar neutrino interaction rate at E kin < 3.49     MeV with the full SK-IV period, using data from a wideband intelligent trigger when available and with a boosted decision tree for event selection. A solar neutrino signal is observed between 2.99     MeV < E kin < 3.49     MeV with 2.76 σ significance and a data to unoscillated Monte Carlo ratio of 0.307 − 0.111 + 0.112 . These additional low-energy data have a negligible effect on the 1 σ intervals of the fits to the solar neutrino energy spectrum but have a noticeable effect on the best fit when using the exponential parametrization.

    DOI: 10.1103/yz79-h758

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/yz79-h758/fulltext

  • Neutron-Multiplicity Measurement in Muon Capture on Oxygen Nuclei in the Gadolinium-Loaded Super-Kamiokande Detector

    S. Miki, K. Abe, S. Abe, Y. Asaoka, C. Bronner, M. Harada, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Mine, M. Miura, S. Moriyama, M. Nakahata, S. Nakayama, Y. Noguchi, K. Okamoto, G. Pronost, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, S. Watanabe, T. Yano, T. Kajita, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, S. Yoshida, G. D. Megias, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, B. W. Pointon, C. Yanagisawa, E. Kearns, J. L. Raaf, L. Wan, T. Wester, J. Bian, B. Cortez, N. J. Griskevich, S. Locke, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, M. C. Jang, S. H. Lee, D. H. Moon, R. G. Park, B. S. Yang, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, O. Drapier, A. Ershova, A. Giampaolo, Th. A. Mueller, A. D. Santos, P. Paganini, C. Quach, B. Quilain, R. Rogly, T. Nakamura, J. S. Jang, R. P. Litchfield, L. N. Machado, F. J. P. Soler, J. G. Learned, K. Choi, N. Iovine, S. Cao, L. H. V. Anthony, D. Martin, N. W. Prouse, M. Scott, A. A. Sztuc, Y. Uchida, V. Berardi, N. F. Calabria, M. G. Catanesi, E. Radicioni, N. F. Calabria, A. Langella, G. De Rosa, G. Collazuol, M. Feltre, F. Iacob, M. Lamoureux, M. Mattiazzi, L. Ludovici, M. Gonin, L. Périssé, B. Quilain, C. Fujisawa, S. Horiuchi, M. Kobayashi, Y. M. Liu, Y. Maekawa, Y. Nishimura, R. Okazaki, R. Akutsu, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, A. Portocarrero Yrey, K. Sakashita, T. Sekiguchi, T. Tsukamoto, N. Bhuiyan, G. T. Burton, F. Di Lodovico, J. Gao, A. Goldsack, T. Katori, J. Migenda, R. M. Ramsden, Z. Xie, S. Zsoldos, Y. Kotsar, H. Ozaki, A. T. Suzuki, Y. Takagi, Y. Takeuchi, H. Zhong, J. Feng, L. Feng, S. Han, J. R. Hu, Z. Hu, M. Kawaue, T. Kikawa, M. Mori, T. Nakaya, T. V. Ngoc, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, P. Mehta, A. Tarrant, M. J. Wilking, Y. Fukuda, Y. Itow, H. Menjo, K. Ninomiya, Y. Yoshioka, J. Lagoda, M. Mandal, P. Mijakowski, Y. S. Prabhu, J. Zalipska, M. Jia, J. Jiang, C. K. Jung, W. Shi, M. J. Wilking, Y. Hino, H. Ishino, H. Kitagawa, Y. Koshio, F. Nakanishi, S. Sakai, T. Tada, T. Tano, T. Ishizuka, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, S. Jung, B. S. Yang, J. Y. Yang, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, T. Peacock, P. Stowell, M. D. Thiesse, L. F. Thompson, S. T. Wilson, H. Okazawa, S. M. Lakshmi, S. B. Kim, E. Kwon, M. W. Lee, J. W. Seo, I. Yu, A. K. Ichikawa, K. D. Nakamura, S. Tairafune, K. Nishijima, A. Eguchi, S. Goto, Y. Mizuno, T. Muro, K. Nakagiri, Y. Nakajima, S. Shima, N. Taniuchi, E. Watanabe, M. Yokoyama, P. de Perio, S. Fujita, C. Jesús-Valls, K. Martens, Ll. Marti, K. M. Tsui, M. R. Vagins, J. Xia, M. Kuze, S. Izumiyama, R. Matsumoto, K. Terada, R. Asaka, M. Ishitsuka, H. Ito, T. Kinoshita, Y. Ommura, N. Shigeta, M. Shinoki, T. Suganuma, K. Yamauchi, T. Yoshida, J. F. Martin, H. A. Tanaka, T. Towstego, Y. Nakano, F. Cormier, R. Gaur, V. Gousy-Leblanc, M. Hartz, A. Konaka, X. Li, B. R. Smithers, S. Chen, Y. Wu, B. D. Xu, A. Q. Zhang, B. Zhang, M. Girgus, P. Govindaraj, M. Posiadala-Zezula, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, S. Amanai, A. Minamino, G. Pintaudi, S. Sano, R. Shibayama, R. Shimamura, S. Suzuki, K. Wada

    Physical Review Letters   136 ( 13 )   2026.3

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    In recent neutrino detectors, neutrons produced in neutrino reactions play an important role. Muon capture on oxygen nuclei is one of the processes that produce neutrons in water Cherenkov detectors. We measured neutron multiplicity in the process using cosmic ray muons that stop in the gadolinium-loaded Super-Kamiokande detector. For this measurement, neutron detection efficiency is obtained with the muon capture events followed by gamma rays to be 50.2 − 2.1 + 2.0 % . By fitting the observed multiplicity considering the detection efficiency, we measure neutron multiplicity in muon capture as P ( 0 ) = 24 ± 3 % , P ( 1 ) = 7 0 − 2 + 3 % , P ( 2 ) = 6.1 ± 0.5 % , P ( 3 ) = 0.38 ± 0.09 % . This is the first measurement of the multiplicity of neutrons associated with muon capture on oxygen without neutron energy threshold.

    DOI: 10.1103/pmyx-jn3s

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/pmyx-jn3s/fulltext

  • Search for nucleon decay via p→νπ+ and n→νπ0 in 0.484 Mton-year of Super-Kamiokande data

    S. Jung, K. Abe, Y. Asaoka, M. Harada, Y. Hayato, K. Hiraide, T. H. Hung, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, K. Nakagiri, M. Nakahata, S. Nakayama, Y. Noguchi, G. Pronost, K. Sato, H. Sekiya, R. Shinoda, M. Shiozawa, Y. Suzuki, A. Takeda, Y. Takemoto, H. Tanaka, T. Yano, S. Chen, Y. Itow, T. Kajita, R. Nishijima, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, P. Fernandez, L. Labarga, D. Samudio, B. Zaldivar, C. Yanagisawa, B. Jargowsky, E. Kearns, J. Mirabito, L. Wan, T. Wester, B. W. Pointon, J. Bian, B. Cortez, N. J. Griskevich, Y. Jiang, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, D. H. Moon, R. G. Park, B. S. Yang, K. Scholberg, C. W. Walter, O. Drapier, A. Ershova, M. Ferey, E. Le Blévec, Th. A. Mueller, P. Paganini, C. Quach, R. Rogly, T. Nakamura, J. S. Jang, R. P. Litchfield, L. N. Machado, F. J. P. Soler, J. G. Learned, K. Choi, S. Cao, L. H. V. Anthony, N. W. Prouse, M. Scott, Y. Uchida, V. Berardi, N. F. Calabria, M. G. Catanesi, N. Ospina, E. Radicioni, A. Langella, G. De Rosa, G. Collazuol, M. Feltre, M. Mattiazzi, L. Ludovici, M. Gonin, L. Périssé, B. Quilain, S. Horiuchi, A. Kawabata, M. Kobayashi, Y. M. Liu, Y. Maekawa, Y. Nishimura, R. Akutsu, M. Friend, T. Hasegawa, Y. Hino, T. Ishida, T. Kobayashi, T. Matsubara, T. Nakadaira, Y. Oyama, A. Portocarrero Yrey, K. Sakashita, T. Sekiguchi, N. Bhuiyan, G. T. Burton, F. Di Lodovico, T. Katori, R. Kralik, N. Latham, R. M. Ramsden, H. Ito, T. Sone, A. T. Suzuki, Y. Takeuchi, S. Wada, H. Zhong, J. Feng, L. Feng, S. Han, J. Hikida, J. R. Hu, Z. Hu, M. Kawaue, T. Kikawa, T. Nakaya, T. V. Ngoc, R. A. Wendell, S. J. Jenkins, N. McCauley, A. Tarrant, M. Fanì, M. J. Wilking, Z. Xie, Y. Fukuda, H. Menjo, Y. Yoshioka, J. Lagoda, M. Mandal, J. Zalipska, M. Mori, J. Jiang, K. Hamaguchi, H. Ishino, Y. Koshio, F. Nakanishi, T. Tada, T. Ishizuka, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, J. Yoo, J. E. P. Fannon, L. Kneale, T. Peacock, P. Stowell, H. Okazawa, S. M. Lakshmi, E. Kwon, M. W. Lee, J. W. Seo, I. Yu, Y. Ashida, A. K. Ichikawa, K. D. Nakamura, S. Abe, S. Goto, H. Hayasaki, S. Kodama, Y. Kong, Y. Masaki, Y. Mizuno, T. Muro, Y. Nakajima, N. Taniuchi, M. Yokoyama, P. de Perio, S. Fujita, C. Jesús-Valls, K. Martens, Ll. Marti, A. D. Santos, K. M. Tsui, M. R. Vagins, M. Kuze, S. Izumiyama, R. Matsumoto, R. Asaka, M. Ishitsuka, M. Sugo, M. Wako, K. Yamauchi, Y. Nakano, F. Cormier, R. Gaur, M. Hartz, A. Konaka, X. Li, B. R. Smithers, S. Chen, Y. Wu, B. D. Xu, A. Q. Zhang, B. Zhang, H. Adhikary, M. Girgus, P. Govindaraj, M. Posiadala-Zezula, Y. S. Prabhu, S. B. Boyd, R. Edwards, D. Hadley, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, C. Bronner, D. Horiguchi, A. Minamino, Y. Sasaki, R. Shibayama, R. Shimamura

    Physical Review D   113 ( 1 )   2026.1

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    We present the results of searches for nucleon decays via p → ν π + and n → ν π 0 using a 0.484     Mt · yr exposure of Super-Kamiokande I-V data covering the entire pure water phase of the experiment. Various improvements on the previous 2014 nucleon decay search [], which used an exposure of 0.173     Mt · yr , are incorporated. The physics models related to pion production and nuclear interaction are refined with external data, and a more comprehensive set of systematic uncertainties, now including those associated with the atmospheric neutrino flux and pion production channels, is considered. Also, the fiducial volume has been expanded by 21%. No significant indication of a nucleon decay signal is found beyond the expected background. Lower bounds on the nucleon partial lifetimes are determined to be 3.5 × 10 32     yr for p → ν π + and 1.4 × 10 33     yr for n → ν π 0 at 90% confidence level.

    DOI: 10.1103/gwc6-55bg

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/gwc6-55bg/fulltext

  • First Associated Neutrino Search for a Failed Supernova Candidate with Super-Kamiokande

    F. Nakanishi, K. Abe, S. Abe, Y. Asaoka, M. Harada, Y. Hayato, K. Hiraide, K. Hosokawa, T. H. Hung, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, M. Nakahata, S. Nakayama, Y. Noguchi, G. Pronost, K. Sato, H. Sekiya, M. Shiozawa, Y. Suzuki, A. Takeda, Y. Takemoto, H. Tanaka, T. Yano, Y. Itow, T. Kajita, R. Nishijima, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, P. Fernandez, L. Labarga, B. Zaldivar, B. W. Pointon, C. Yanagisawa, E. Kearns, L. Wan, T. Wester, J. Bian, B. Cortez, N. J. Griskevich, Y. Jiang, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, M. C. Jang, S. H. Lee, D. H. Moon, R. G. Park, B. S. Yang, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, Le Blévec, O. Drapier, A. Ershova, M. Ferey, Th. A. Mueller, A. D. Santos, P. Paganini, C. Quach, R. Rogly, T. Nakamura, J. S. Jang, R. P. Litchfield, L. N. Machado, F. J. .P Soler, J. G. Learned, K. Choi, S. Cao, L. H. V. Anthony, N. W. Prouse, M. Scott, Y. Uchida, V. Berardi, N. F. Calabria, M. G. Catanesi, N. Ospina, E. Radicioni, A. Langella, G. De Rosa, G. Collazuol, M. Feltre, M. Mattiazzi, L. Ludovici, M. Gonin, L. Périssé, B. Quilain, S. Horiuchi, A. Kawabata, M. Kobayashi, Y. M. Liu, Y. Maekawa, Y. Nishimura, R. Akutsu, M. Friend, T. Hasegawa, Y. Hino, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, Y. Oyama, A. Portocarrero Yrey, K. Sakashita, T. Sekiguchi, T. Tsukamoto, N. Bhuiyan, G. T. Burton, F. Di Lodovico, J. Gao, T. Katori, R. Kralik, N. Latham, R. M. Ramsden, H. Ito, T. Sone, A. T. Suzuki, Y. Takeuchi, S. Wada, H. Zhong, J. Feng, L. Feng, S. Han, J. Hikida, J. R. Hu, Z. Hu, M. Kawaue, T. Kikawa, T. V. Ngoc, T. Nakaya, R. A. Wendell, S. J. Jenkins, N. McCauley, A. Tarrant, M. Fanì, M. J. Wilking, Z. Xie, Y. Fukuda, H. Menjo, Y. Yoshioka, J. Lagoda, M. Mandal, J. Zalipska, M. Mori, J. Jiang, K. Hamaguchi, H. Ishino, Y. Koshio, T. Tada, T. Ishizuka, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, S. Jung, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, T. Peacock, P. Stowell, M. D. Thiesse, L. F. Thompson, H. Okazawa, S. M. Lakshmi, E. Kwon, M. W. Lee, J. W. Seo, I. Yu, Y. Ashida, A. K. Ichikawa, K. D. Nakamura, S. Goto, H. Hayasaki, S. Kodama, Y. Kong, Y. Masaki, Y. Mizuno, T. Muro, K. Nakagiri, Y. Nakajima, N. Taniuchi, M. Yokoyama, P. De Perio, S. Fujita, C. Jesús-Valls, K. Martens, Ll. Marti, K. M. Tsui, M. R. Vagins, J. Xia, M. Kuze, S. Izumiyama, R. Matsumoto, R. Asaka, M. Ishitsuka, M. Sugo, M. Wako, K. Yamauchi, Y. Nakano, F. Cormier, R. Gaur, M. Hartz, A. Konaka, X. Li, B. R. Smithers, S. Chen, Y. Wu, B. D. Xu, A. Q. Zhang, B. Zhang, H. Adhikary, M. Girgus, P. Govindaraj, M. Posiadala-Zezula, Y. S. Prabhu, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, C. Bronner, D. Horiguchi, A. Minamino, Y. Sasaki, R. Shibayama, R. Shimamura

    The Astrophysical Journal Letters   997 ( 1 )   L9 - L9   2026.1

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    Publishing type:Research paper (scientific journal)   Publisher:American Astronomical Society  

    Abstract

    In 2024, a failed supernova (SN) candidate, M31-2014-DS1, was reported in the Andromeda galaxy (M31), located at a distance of approximately 770 kpc. In this Letter, we search for neutrinos from this failed SN using data from Super-Kamiokande (SK). Based on the estimated time of black hole formation inferred from optical and infrared observations, we define a search window for neutrino events in the SK data. Using this window, we develop a dedicated analysis method for failed SNe and apply it to M31-2014-DS1, by conducting a cluster search using the timing and energy information of candidate events. No significant neutrino excess is observed within the search region. Consequently, we place an upper limit on the time-integrated electron antineutrino luminosity from M31-2014-DS1 and discuss its implications for various failed SN models and their neutrino emission characteristics. Despite the 18 MeV threshold adopted to suppress backgrounds, the search remains sufficiently sensitive to constrain the Shen-TM1 equation of state, in a more optimistic emission scenario with progenitor stars of 40 M ⊙ and relatively high mean electron-antineutrino energies of about 23.2 MeV, yielding a 90% confidence level upper limit of 1.76 × 10 53 erg on the time-integrated electron antineutrino luminosity, moderately above the expected value of 1.35 × 10 53 erg.

    DOI: 10.3847/2041-8213/ae2c73

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    Other Link: https://iopscience.iop.org/article/10.3847/2041-8213/ae2c73/pdf

  • Measurement of the branching ratio of 16N, 15C, 12B, and 13B isotopes through the nuclear muon capture reaction in the Super-Kamiokande detector

    Y. Maekawa, K. Abe, S. Abe, Y. Asaoka, M. Harada, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, M. Nakahata, S. Nakayama, Y. Noguchi, G. Pronost, K. Sato, H. Sekiya, K. Shimizu, R. Shinoda, M. Shiozawa, Y. Suzuki, A. Takeda, Y. Takemoto, H. Tanaka, T. Yano, Y. Itow, T. Kajita, R. Nishijima, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, P. Fernandez, L. Labarga, D. Samudio, B. Zaldivar, C. Yanagisawa, E. Kearns, J. Mirabito, L. Wan, T. Wester, B. W. Pointon, J. Bian, B. Cortez, N. J. Griskevich, Y. Jiang, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, M. C. Jang, S. H. Lee, D. H. Moon, R. G. Park, B. S. Yang, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, O. Drapier, A. Ershova, Th. A. Mueller, A. D. Santos, P. Paganini, C. Quach, R. Rogly, T. Nakamura, J. S. Jang, R. P. Litchfield, L. N. Machado, F. J. P. Soler, J. G. Learned, K. Choi, N. Iovine, S. Cao, L. H. V. Anthony, D. Martin, N. W. Prouse, M. Scott, Y. Uchida, V. Berardi, N. F. Calabria, M. G. Catanesi, N. Ospina, E. Radicioni, A. Langella, G. De Rosa, G. Collazuol, M. Feltre, M. Mattiazzi, L. Ludovici, M. Gonin, L. Périssé, B. Quilain, S. Horiuchi, A. Kawabata, M. Kobayashi, Y. M. Liu, Y. Nishimura, R. Okazaki, R. Akutsu, M. Friend, T. Hasegawa, Y. Hino, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, A. Portocarrero Yrey, K. Sakashita, T. Sekiguchi, T. Tsukamoto, N. Bhuiyan, G. T. Burton, R. Kralik, N. Latham, F. Di Lodovico, J. Gao, T. Katori, J. Migenda, R. M. Ramsden, Z. Xie, S. Zsoldos, H. Ito, T. Sone, A. T. Suzuki, Y. Takagi, Y. Takeuchi, S. Wada, H. Zhong, J. Feng, L. Feng, S. Han, J. Hikida, J. R. Hu, Z. Hu, M. Kawaue, T. Kikawa, T. Nakaya, T. V. Ngoc, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, A. Tarrant, M. Fanì, M. J. Wilking, Z. Xie, Y. Fukuda, H. Menjo, Y. Yoshioka, J. Lagoda, M. Mandal, Y. S. Prabhu, J. Zalipska, M. Mori, M. Jia, J. Jiang, W. Shi, K. Hamaguchi, H. Ishino, Y. Koshio, F. Nakanishi, S. Sakai, T. Tada, T. Tano, T. Ishizuka, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, S. Jung, J. Y. Yang, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, T. Peacock, P. Stowell, M. D. Thiesse, L. F. Thompson, S. T. Wilson, H. Okazawa, S. M. Lakshmi, E. Kwon, M. W. Lee, J. W. Seo, I. Yu, A. K. Ichikawa, K. D. Nakamura, S. Tairafune, A. Eguchi, S. Goto, H. Hayasaki, S. Kodama, Y. Masaki, Y. Mizuno, T. Muro, K. Nakagiri, Y. Nakajima, N. Taniuchi, E. Watanabe, M. Yokoyama, P. de Perio, S. Fujita, C. Jesús-Valls, K. Martens, Ll. Marti, K. M. Tsui, M. R. Vagins, J. Xia, S. Izumiyama, M. Kuze, R. Matsumoto, K. Terada, R. Asaka, M. Ishitsuka, M. Shinoki, M. Sugo, M. Wako, K. Yamauchi, T. Yoshida, Y. Nakano, F. Cormier, R. Gaur, V. Gousy-Leblanc, M. Hartz, A. Konaka, X. Li, B. R. Smithers, S. Chen, Y. Wu, B. D. Xu, A. Q. Zhang, B. Zhang, M. Girgus, P. Govindaraj, M. Posiadala-Zezula, Y. S. Prabhu, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O'Flaherty, B. Richards, A. Ali, B. Jamieson, S. Amanai, C. Bronner, D. Horiguchi, A. Minamino, Y. Sasaki, R. Shibayama, R. Shimamura

    Physical Review C   112 ( 6 )   2025.12

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    DOI: 10.1103/b93l-dbpj

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  • Results from the T2K Experiment on Neutrino Mixing Including a New Far Detector μ-like Sample

    K. Abe, S. Abe, R. Akutsu, H. Alarakia-Charles, Y. I. Alj Hakim, S. Alonso Monsalve, L. Anthony, S. Aoki, K. A. Apte, T. Arai, T. Arihara, S. Arimoto, Y. Ashida, E. T. Atkin, N. Babu, V. Baranov, G. J. Barker, G. Barr, D. Barrow, P. Bates, L. Bathe-Peters, M. Batkiewicz-Kwasniak, N. Baudis, V. Berardi, L. Berns, S. Bhattacharjee, A. Blanchet, A. Blondel, P. M. M. Boistier, S. Bolognesi, S. Bordoni, S. B. Boyd, C. Bronner, A. Bubak, M. Buizza Avanzini, J. A. Caballero, F. Cadoux, N. F. Calabria, S. Cao, S. Cap, D. Carabadjac, S. L. Cartwright, M. P. Casado, M. G. Catanesi, J. Chakrani, A. Chalumeau, D. Cherdack, A. Chvirova, J. Coleman, G. Collazuol, F. Cormier, A. A. L. Craplet, A. Cudd, D. D’Ago, C. Dalmazzone, T. Daret, P. Dasgupta, C. Davis, Yu. I. Davydov, P. de Perio, G. De Rosa, T. Dealtry, C. Densham, A. Dergacheva, R. Dharmapal Banerjee, F. Di Lodovico, G. Diaz Lopez, S. Dolan, D. Douqa, T. A. Doyle, O. Drapier, K. E. Duffy, J. Dumarchez, P. Dunne, K. Dygnarowicz, A. Eguchi, J. Elias, S. Emery-Schrenk, G. Erofeev, A. Ershova, G. Eurin, D. Fedorova, S. Fedotov, M. Feltre, L. Feng, D. Ferlewicz, A. J. Finch, M. D. Fitton, C. Forza, M. Friend, Y. Fujii, Y. Fukuda, Y. Furui, J. García-Marcos, A. C. Germer, L. Giannessi, C. Giganti, M. Girgus, V. Glagolev, M. Gonin, R. González Jiménez, J. González Rosa, E. A. G. Goodman, K. Gorshanov, P. Govindaraj, M. Grassi, M. Guigue, F. Y. Guo, D. R. Hadley, S. Han, D. A. Harris, R. J. Harris, T. Hasegawa, C. M. Hasnip, S. Hassani, N. C. Hastings, Y. Hayato, I. Heitkamp, D. Henaff, Y. Hino, J. Holeczek, A. Holin, T. Holvey, N. T. Hong Van, T. Honjo, M. C. F. Hooft, K. Hosokawa, J. Hu, A. K. Ichikawa, K. Ieki, M. Ikeda, T. H. Ishida, T. Ishida, M. Ishitsuka, H. Ito, S. Ito, A. Izmaylov, N. Jachowicz, S. J. Jenkins, C. Jesús-Valls, M. Jia, J. J. Jiang, J. Y. Ji, T. P. Jones, P. Jonsson, S. Joshi, C. K. Jung, M. Kabirnezhad, A. C. Kaboth, H. Kakuno, J. Kameda, S. Karpova, V. S. Kasturi, Y. Kataoka, T. Katori, A. Kawabata, Y. Kawamura, M. Kawaue, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, S. King, V. Kiseeva, J. Kisiel, A. Klustová, L. Kneale, H. Kobayashi, Sota. R. Kobayashi, L. Koch, S. Kodama, M. Kolupanova, A. Konaka, L. L. Kormos, Y. Koshio, K. Kowalik, Y. Kudenko, Y. Kudo, A. Kumar Jha, R. Kurjata, V. Kurochka, T. Kutter, L. Labarga, M. Lachat, K. Lachner, J. Lagoda, S. M. Lakshmi, M. Lamers James, A. Langella, D. H. Langridge, J.-F. Laporte, D. Last, N. Latham, M. Laveder, L. Lavitola, M. Lawe, D. Leon Silverio, S. Levorato, S. V. Lewis, B. Li, C. Lin, R. P. Litchfield, S. L. Liu, W. Li, A. Longhin, A. Lopez Moreno, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, K. K. Mahtani, M. Mandal, S. Manly, A. D. Marino, D. G. R. Martin, D. A. Martinez Caicedo, L. Martinez, M. Martini, T. Matsubara, R. Matsumoto, V. Matveev, C. Mauger, K. Mavrokoridis, N. McCauley, K. S. McFarland, C. McGrew, J. McKean, A. Mefodiev, G. D. Megias, L. Mellet, C. Metelko, M. Mezzetto, S. Miki, V. Mikola, E. W. Miller, A. Minamino, O. Mineev, S. Mine, J. Mirabito, M. Miura, S. Moriyama, S. Moriyama, P. Morrison, Th. A. Mueller, D. Munford, A. Muñoz, L. Munteanu, Y. Nagai, T. Nakadaira, K. Nakagiri, M. Nakahata, Y. Nakajima, K. D. Nakamura, A. Nakano, Y. Nakano, S. Nakayama, T. Nakaya, K. Nakayoshi, C. E. R. Naseby, D. T. Nguyen, V. Q. Nguyen, K. Niewczas, S. Nishimori, Y. Nishimura, Y. Noguchi, T. Nosek, F. Nova, J. C. Nugent, H. M. O’Keeffe, L. O’Sullivan, R. Okazaki, W. Okinaga, K. Okumura, T. Okusawa, N. Onda, N. Ospina, L. Osu, N. Otani, Y. Oyama, V. Paolone, J. Pasternak, D. Payne, T. P. D. Peacock, M. Pfaff, L. Pickering, B. Popov, A. J. Portocarrero Yrey, M. Posiadala-Zezula, Y. S. Prabhu, H. Prasad, F. Pupilli, B. Quilain, P. T. Quyen, E. Radicioni, B. Radics, M. A. Ramirez Delgado, R. Ramsden, P. N. Ratoff, M. Reh, G. Reina, C. Riccio, D. W. Riley, E. Rondio, S. Roth, N. Roy, A. Rubbia, L. Russo, A. Rychter, W. Saenz, K. Sakashita, S. Samani, F. Sánchez, E. M. Sandford, Y. Sato, T. Schefke, C. M. Schloesser, K. Scholberg, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, T. Sekiya, D. Seppala, D. Sgalaberna, A. Shaikhiev, M. Shiozawa, Y. Shiraishi, A. Shvartsman, N. Skrobova, K. Skwarczynski, D. Smyczek, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, A. J. Speers, R. Spina, A. Srivastava, P. Stowell, Y. Stroke, I. A. Suslov, A. Suzuki, S. Y. Suzuki, M. Tada, S. Tairafune, A. Takeda, Y. Takeuchi, K. Takeya, H. K. Tanaka, H. Tanigawa, A. Teklu, V. V. Tereshchenko, N. Thamm, C. Touramanis, N. Tran, T. Tsukamoto, M. Tzanov, Y. Uchida, M. Vagins, M. Varghese, I. Vasilyev, G. Vasseur, E. Villa, U. Virginet, T. Vladisavljevic, T. Wachala, S.-i. Wada, D. Wakabayashi, H. T. Wallace, J. G. Walsh, L. Wan, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, K. Wood, C. Wret, J. Xia, K. Yamamoto, T. Yamamoto, C. Yanagisawa, Y. Yang, T. Yano, K. Yasutome, N. Yershov, U. Yevarouskaya, M. Yokoyama, Y. Yoshimoto, N. Yoshimura, R. Zaki, A. Zalewska, J. Zalipska, G. Zarnecki, J. Zhang, X. Y. Zhao, H. Zheng, H. Zhong, T. Zhu, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos

    Physical Review Letters   135 ( 26 )   2025.12

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    We have made improved measurements of three-flavor neutrino mixing with 19.7 ( 16.3 ) × 10 20 protons on target in (anti-)neutrino-enhanced beam modes. A new sample of muon-neutrino events with tagged pions has been added at the far detector, as well as new proton and photon-tagged samples at the near detector. Significant improvements have been made to the flux and neutrino interaction modeling. T2K data continue to prefer the normal mass ordering and upper octant of sin 2 θ 23 with a near-maximal value of the charge-parity violating phase with best-fit values in the normal ordering of δ CP = − 2.18 − 0.47 + 1.22 , sin 2 θ 23 = 0.559 − 0.078 + 0.018 and Δ m 32 2 = ( + 2.506 − 0.052 + 0.039 ) × 10 − 3     eV 2 .

    DOI: 10.1103/gh5j-5cwv

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  • Measurement of muon neutrino induced charged current interactions without charged pions in the final state using a new T2K off-axis near detector WAGASCI-BabyMIND

    K. Abe, S. Abe, R. Akutsu, H. Alarakia-Charles, Y. I. Alj Hakim, S. Alonso Monsalve, L. Anthony, S. Aoki, K. A. Apte, T. Arai, T. Arihara, S. Arimoto, Y. Ashida, E. T. Atkin, N. Babu, V. Baranov, G. J. Barker, G. Barr, D. Barrow, P. Bates, L. Bathe-Peters, M. Batkiewicz-Kwasniak, N. Baudis, V. Berardi, L. Berns, S. Bhattacharjee, A. Blanchet, A. Blondel, P. M. M. Boistier, S. Bolognesi, S. Bordoni, S. B. Boyd, C. Bronner, A. Bubak, M. Buizza Avanzini, F. Cadoux, N. F. Calabria, S. Cao, S. Cap, D. Carabadjac, S. L. Cartwright, M. P. Casado, M. G. Catanesi, J. Chakrani, A. Chalumeau, D. Cherdack, A. Chvirova, J. Coleman, G. Collazuol, F. Cormier, A. A. L. Craplet, A. Cudd, D. D’Ago, C. Dalmazzone, T. Daret, P. Dasgupta, C. Davis, Yu. I. Davydov, P. de Perio, G. De Rosa, T. Dealtry, C. Densham, A. Dergacheva, R. Dharmapal Banerjee, F. Di Lodovico, G. Diaz Lopez, S. Dolan, D. Douqa, T. A. Doyle, O. Drapier, K. E. Duffy, J. Dumarchez, P. Dunne, K. Dygnarowicz, A. Eguchi, J. Elias, S. Emery-Schrenk, G. Erofeev, A. Ershova, G. Eurin, D. Fedorova, S. Fedotov, M. Feltre, L. Feng, D. Ferlewicz, A. J. Finch, M. D. Fitton, C. Forza, M. Friend, Y. Fujii, Y. Fukuda, Y. Furui, J. García-Marcos, A. C. Germer, L. Giannessi, C. Giganti, M. Girgus, V. Glagolev, M. Gonin, E. A. G. Goodman, K. Gorshanov, P. Govindaraj, M. Grassi, M. Guigue, F. Y. Guo, D. R. Hadley, S. Han, D. A. Harris, R. J. Harris, T. Hasegawa, C. M. Hasnip, S. Hassani, N. C. Hastings, Y. Hayato, I. Heitkamp, D. Henaff, Y. Hino, J. Holeczek, A. Holin, T. Holvey, N. T. Hong Van, T. Honjo, M. C. F. Hooft, K. Hosokawa, J. Hu, A. K. Ichikawa, K. Ieki, M. Ikeda, T. H. Ishida, T. Ishida, M. Ishitsuka, H. Ito, S. Ito, A. Izmaylov, N. Jachowicz, S. J. Jenkins, C. Jesús-Valls, M. Jia, J. J. Jiang, J. Y. Ji, T. P. Jones, P. Jonsson, S. Joshi, C. K. Jung, M. Kabirnezhad, A. C. Kaboth, H. Kakuno, J. Kameda, S. Karpova, V. S. Kasturi, Y. Kataoka, T. Katori, A. Kawabata, Y. Kawamura, M. Kawaue, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, S. King, V. Kiseeva, J. Kisiel, A. Klustová, L. Kneale, H. Kobayashi, Sota. R. Kobayashi, L. Koch, S. Kodama, M. Kolupanova, A. Konaka, L. L. Kormos, Y. Koshio, K. Kowalik, Y. Kudenko, Y. Kudo, A. Kumar Jha, R. Kurjata, V. Kurochka, T. Kutter, L. Labarga, M. Lachat, K. Lachner, J. Lagoda, S. M. Lakshmi, M. Lamers James, A. Langella, D. H. Langridge, J.-F. Laporte, D. Last, N. Latham, M. Laveder, L. Lavitola, M. Lawe, D. Leon Silverio, S. Levorato, S. V. Lewis, B. Li, C. Lin, R. P. Litchfield, S. L. Liu, W. Li, A. Longhin, A. Lopez Moreno, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, K. K. Mahtani, M. Mandal, S. Manly, A. D. Marino, D. G. R. Martin, D. A. Martinez Caicedo, L. Martinez, M. Martini, T. Matsubara, R. Matsumoto, V. Matveev, C. Mauger, K. Mavrokoridis, N. McCauley, K. S. McFarland, C. McGrew, J. McKean, A. Mefodiev, L. Mellet, C. Metelko, M. Mezzetto, S. Miki, V. Mikola, E. W. Miller, A. Minamino, O. Mineev, S. Mine, J. Mirabito, M. Miura, S. Moriyama, S. Moriyama, P. Morrison, Th. A. Mueller, D. Munford, A. Muñoz, L. Munteanu, Y. Nagai, T. Nakadaira, K. Nakagiri, M. Nakahata, Y. Nakajima, K. D. Nakamura, A. Nakano, Y. Nakano, S. Nakayama, T. Nakaya, K. Nakayoshi, C. E. R. Naseby, D. T. Nguyen, V. Q. Nguyen, K. Niewczas, S. Nishimori, Y. Nishimura, Y. Noguchi, T. Nosek, F. Nova, J. C. Nugent, H. M. O’Keeffe, L. O’Sullivan, R. Okazaki, W. Okinaga, K. Okumura, T. Okusawa, N. Onda, N. Ospina, L. Osu, N. Otani, Y. Oyama, V. Paolone, J. Pasternak, D. Payne, T. P. D. Peacock, M. Pfaff, L. Pickering, G. Pintaudi, B. Popov, A. J. Portocarrero Yrey, M. Posiadala-Zezula, Y. S. Prabhu, H. Prasad, F. Pupilli, B. Quilain, P. T. Quyen, E. Radicioni, B. Radics, M. A. Ramirez Delgado, R. Ramsden, P. N. Ratoff, M. Reh, G. Reina, C. Riccio, D. W. Riley, E. Rondio, S. Roth, N. Roy, A. Rubbia, L. Russo, A. Rychter, W. Saenz, K. Sakashita, S. Samani, F. Sánchez, E. M. Sandford, Y. Sato, T. Schefke, C. M. Schloesser, K. Scholberg, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, T. Sekiya, D. Seppala, D. Sgalaberna, A. Shaikhiev, M. Shiozawa, Y. Shiraishi, A. Shvartsman, N. Skrobova, K. Skwarczynski, D. Smyczek, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, A. J. Speers, R. Spina, A. Srivastava, P. Stowell, Y. Stroke, I. A. Suslov, A. Suzuki, S. Y. Suzuki, M. Tada, S. Tairafune, A. Takeda, Y. Takeuchi, K. Takeya, H. K. Tanaka, H. Tanigawa, A. Teklu, V. V. Tereshchenko, N. Thamm, C. Touramanis, N. Tran, T. Tsukamoto, M. Tzanov, Y. Uchida, M. Vagins, M. Varghese, I. Vasilyev, G. Vasseur, E. Villa, U. Virginet, T. Vladisavljevic, T. Wachala, S.-i. Wada, D. Wakabayashi, H. T. Wallace, J. G. Walsh, L. Wan, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, K. Wood, C. Wret, J. Xia, K. Yamamoto, T. Yamamoto, C. Yanagisawa, Y. Yang, T. Yano, K. Yasutome, N. Yershov, U. Yevarouskaya, M. Yokoyama, Y. Yoshimoto, N. Yoshimura, R. Zaki, A. Zalewska, J. Zalipska, G. Zarnecki, J. Zhang, X. Y. Zhao, H. Zheng, H. Zhong, T. Zhu, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos

    Physical Review D   112 ( 11 )   2025.12

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    We report a flux-integrated cross section measurement of muon neutrino interactions on water and hydrocarbon via charged current reactions without charged pions in the final state with the WAGASCI-BabyMIND detector, which was installed in the T2K near detector hall in 2018. The detector is located 1.5° off-axis and is exposed to a more energetic neutrino flux than ND280, another T2K near detector, which is located at a different off-axis position. The total flux-integrated cross section is measured to be 1.26 ± 0.18 ( stat + syst ) × 10 − 39     cm 2 / nucleon on CH and 1.44 ± 0.21 ( stat + syst ) × 10 − 39     cm 2 / nucleon on H 2 O . These results are compared to model predictions provided by the v5.3.2 and v2.8.0 Monte Carlo generators and the measurements are compatible with these models. Differential cross sections in muon momentum and cosine of the muon scattering angle are also reported. This is the first such measurement reported with the WAGASCI-BabyMIND detector and utilizes the 2020 and 2021 datasets.

    DOI: 10.1103/fpqb-j6nv

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  • Testing T2K’s Bayesian constraints with priors in alternate parameterisations

    A. Abe, S. Abe, R. Akutsu, H. Alarakia-Charles, Y. I. Alj Hakim, S. Alonso Monsalve, L. Anthony, S. Aoki, K. A. Apte, T. Arai, T. Arihara, S. Arimoto, Y. Ashida, E. T. Atkin, N. Babu, V. Baranov, G. J. Barker, G. Barr, D. Barrow, P. Bates, L. Bathe-Peters, M. Batkiewicz-Kwasniak, N. Baudis, V. Berardi, L. Berns, S. Bhattacharjee, A. Blanchet, A. Blondel, P. M. M. Boistier, S. Bolognesi, S. Bordoni, S. B. Boyd, C. Bronner, A. Bubak, M. Buizza Avanzini, J. A. Caballero, F. Cadoux, N. F. Calabria, S. Cao, S. Cap, D. Carabadjac, S. L. Cartwright, M. P. Casado, M. G. Catanesi, J. Chakrani, A. Chalumeau, D. Cherdack, P. S. Chong, A. Chvirova, J. Coleman, G. Collazuol, F. Cormier, A. A. L. Craplet, A. Cudd, D. D’ago, C. Dalmazzone, T. Daret, P. Dasgupta, C. Davis, Yu. I. Davydov, P. de Perio, G. De Rosa, T. Dealtry, C. Densham, A. Dergacheva, R. Dharmapal Banerjee, F. Di Lodovico, G. Diaz Lopez, S. Dolan, D. Douqa, T. A. Doyle, O. Drapier, K. E. Duffy, J. Dumarchez, P. Dunne, K. Dygnarowicz, A. Eguchi, J. Elias, S. Emery-Schrenk, G. Erofeev, A. Ershova, G. Eurin, D. Fedorova, S. Fedotov, M. Feltre, L. Feng, D. Ferlewicz, A. J. Finch, M. D. Fitton, C. Forza, M. Friend, Y. Fujii, Y. Fukuda, Y. Furui, J. García-Marcos, A. C. Germer, L. Giannessi, C. Giganti, M. Girgus, V. Glagolev, M. Gonin, R. González Jiménez, J. González Rosa, E. A. G. Goodman, K. Gorshanov, P. Govindaraj, M. Grassi, M. Guigue, F. Y. Guo, D. R. Hadley, S. Han, D. A. Harris, R. J. Harris, T. Hasegawa, C. M. Hasnip, S. Hassani, N. C. Hastings, Y. Hayato, I. Heitkamp, D. Henaff, Y. Hino, J. Holeczek, A. Holin, T. Holvey, N. T. Hong Van, T. Honjo, M. C. F. Hooft, K. Hosokawa, J. Hu, A. K. Ichikawa, K. Ieki, M. Ikeda, T. Ishida, M. Ishitsuka, H. Ito, S. Ito, A. Izmaylov, N. Jachowicz, S. J. Jenkins, C. Jesús-Valls, M. Jia, J. J. Jiang, J. Y. Ji, T. P. Jones, P. Jonsson, S. Joshi, M. Kabirnezhad, A. C. Kaboth, H. Kakuno, J. Kameda, S. Karpova, V. S. Kasturi, Y. Kataoka, T. Katori, A. Kawabata, Y. Kawamura, M. Kawaue, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, S. King, V. Kiseeva, J. Kisiel, A. Klustová, L. Kneale, H. Kobayashi, L. Koch, S. Kodama, M. Kolupanova, A. Konaka, L. L. Kormos, Y. Koshio, K. Kowalik, Y. Kudenko, Y. Kudo, A. Kumar Jha, R. Kurjata, V. Kurochka, T. Kutter, L. Labarga, M. Lachat, K. Lachner, J. Lagoda, S. M. Lakshmi, M. Lamers James, A. Langella, D. H. Langridge, J.-F. Laporte, D. Last, N. Latham, M. Laveder, L. Lavitola, M. Law, D. Leon Silverio, S. Levorato, S. V. Lewis, B. Li, C. Lin, R. P. Litchfield, S. L. Liu, W. Li, A. Longhin, A. Lopez Moreno, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, K. K. Mahtani, M. Mandal, S. Manly, A. D. Marino, D. G. R. Martin, D. A. Martinez Caicedo, L. Martinez, M. Martini, T. Matsubara, R. Matsumoto, V. Matveev, C. Mauger, K. Mavrokoridis, N. McCauley, K. S. McFarland, C. McGrew, J. McKean, A. Mefodiev, G. D. Megias, L. Mellet, C. Metelko, M. Mezzetto, S. Miki, V. Mikola, E. W. Miller, A. Minamino, O. Mineev, S. Mine, J. Mirabito, M. Miura, S. Moriyama, S. Moriyama, P. Morrison, Th. A. Mueller, D. Munford, A. Muñoz, L. Munteanu, Y. Nagai, T. Nakadaira, K. Nakagiri, M. Nakahata, Y. Nakajima, K. D. Nakamura, A. Nakano, Y. Nakano, S. Nakayama, T. Nakaya, K. Nakayoshi, C. E. R. Naseby, D. T. Nguyen, V. Q. Nguyen, K. Niewczas, S. Nishimori, Y. Nishimura, Y. Noguchi, T. Nosek, F. Nova, P. Novella, J. C. Nugent, H. M. O’Keeffe, L. O’Sullivan, R. Okazaki, W. Okinaga, K. Okumura, T. Okusawa, N. Onda, N. Ospina, L. Osu, N. Otani, Y. Oyama, V. Paolone, J. Pasternak, D. Payne, M. Pfaff, L. Pickering, B. Popov, A. J. Portocarrero Yrey, M. Posiadala-Zezula, Y. S. Prabhu, H. Prasad, F. Pupilli, B. Quilain, P. T. Quyen, E. Radicioni, B. Radics, M. A. Ramirez, R. Ramsden, P. N. Ratoff, M. Reh, G. Reina, C. Riccio, D. W. Riley, E. Rondio, S. Roth, N. Roy, A. Rubbia, L. Russo, A. Rychter, W. Saenz, K. Sakashita, S. Samani, F. Sánchez, E. M. Sandford, Y. Sato, T. Schefke, C. M. Schloesser, K. Scholberg, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, T. Sekiya, D. Seppala, D. Sgalaberna, A. Shaikhiev, M. Shiozawa, Y. Shiraishi, A. Shvartsman, N. Skrobova, K. Skwarczynski, D. Smyczek, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, A. J. Speers, R. Spina, A. Srivastava, P. Stowell, Y. Stroke, I. A. Suslov, A. Suzuki, S. Y. Suzuki, M. Tada, S. Tairafune, A. Takeda, M. Takeuchi, K. Takeya, H. K. Tanaka, H. Tanigawa, V. V. Tereshchenko, N. Thamm, C. Touramanis, N. Tran, T. Tsukamoto, M. Tzanov, Y. Uchida, M. Vagins, M. Varghese, I. Vasilyev, G. Vasseur, E. Villa, U. Virginet, T. Vladisavljevic, T. Wachala, S.-i. Wada, D. Wakabayashi, H. T. Wallace, J. G. Walsh, L. Wan, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, K. Wood, C. Wret, J. Xia, K. Yamamoto, T. Yamamoto, C. Yanagisawa, Y. Yang, T. Yano, N. Yershov, U. Yevarouskaya, M. Yokoyama, Y. Yoshimoto, Y. Yoshimura, R. Zaki, A. Zalewska, J. Zalipska, G. Zarnecki, J. Zhang, X. Y. Zhao, H. Zheng, H. Zhong, T. Zhu, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos

    The European Physical Journal C   85 ( 12 )   2025.12

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Abstract

    Bayesian analysis results require a choice of prior distribution. In long-baseline neutrino oscillation physics, the usual parameterisation of the mixing matrix induces a prior that privileges certain neutrino mass and flavour state symmetries. Here we study the effect of privileging alternate symmetries on the results of the T2K experiment. We find that constraints on the level of CP violation (as given by the Jarlskog invariant) are robust under the choices of prior considered in the analysis. On the other hand, the degree of octant preference for the atmospheric angle depends on which symmetry has been privileged.

    DOI: 10.1140/epjc/s10052-025-14836-0

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  • Search for neutron decay into an antineutrino and a neutral kaon in 0.401 megaton-years exposure of Super-Kamiokande

    K. Yamauchi, K. Abe, S. Abe, Y. Asaoka, M. Harada, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, M. Nakahata, S. Nakayama, Y. Noguchi, G. Pronost, K. Sato, H. Sekiya, K. Shimizu, R. Shinoda, M. Shiozawa, Y. Suzuki, A. Takeda, Y. Takemoto, H. Tanaka, T. Yano, Y. Itow, T. Kajita, R. Nishijima, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, P. Fernandez, L. Labarga, D. Samudio, B. Zaldivar, B. W. Pointon, C. Yanagisawa, E. Kearns, J. Mirabito, L. Wan, T. Wester, J. Bian, B. Cortez, N. J. Griskevich, Y. Jiang, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, M. C. Jang, S. H. Lee, D. H. Moon, R. G. Park, B. S. Yang, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, O. Drapier, A. Ershova, Th. A. Mueller, A. D. Santos, P. Paganini, C. Quach, R. Rogly, T. Nakamura, J. S. Jang, R. P. Litchfield, L. N. Machado, F. J. P. Soler, J. G. Learned, K. Choi, N. Iovine, D. Tiwari, S. Cao, L. H. V. Anthony, D. Martin, N. W. Prouse, M. Scott, Y. Uchida, V. Berardi, N. F. Calabria, M. G. Catanesi, N. Ospina, E. Radicioni, A. Langella, G. De Rosa, G. Collazuol, M. Feltre, M. Mattiazzi, L. Ludovici, M. Gonin, L. Périssé, B. Quilain, S. Horiuchi, A. Kawabata, M. Kobayashi, Y. M. Liu, Y. Maekawa, Y. Nishimura, R. Okazaki, R. Akutsu, M. Friend, T. Hasegawa, Y. Hino, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, A. Portocarrero Yrey, K. Sakashita, T. Sekiguchi, T. Tsukamoto, N. Bhuiyan, G. T. Burton, F. Di Lodovico, J. Gao, T. Katori, R. Kralik, J. Migenda, R. M. Ramsden, S. Zsoldos, H. Ito, T. Sone, A. T. Suzuki, Y. Takagi, Y. Takeuchi, S. Wada, H. Zhong, J. Feng, L. Feng, S. Han, J. Hikida, J. R. Hu, Z. Hu, M. Kawaue, T. Kikawa, T. Nakaya, T. V. Ngoc, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, A. Tarrant, M. Fanì, M. J. Wilking, Z. Xie, Y. Fukuda, H. Menjo, Y. Yoshioka, J. Lagoda, M. Mandal, J. Zalipska, M. Mori, M. Jia, J. Jiang, W. Shi, K. Hamaguchi, H. Ishino, Y. Koshio, F. Nakanishi, S. Sakai, T. Tada, T. Tano, T. Ishizuka, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, S. Jung, J. Y. Yang, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, T. Peacock, P. Stowell, M. D. Thiesse, L. F. Thompson, S. T. Wilson, H. Okazawa, S. M. Lakshmi, E. Kwon, M. W. Lee, J. W. Seo, I. Yu, A. K. Ichikawa, K. D. Nakamura, S. Tairafune, A. Eguchi, S. Goto, S. Kodama, Y. Mizuno, T. Muro, K. Nakagiri, Y. Nakajima, N. Taniuchi, E. Watanabe, M. Yokoyama, P. de Perio, S. Fujita, C. Jesús-Valls, K. Martens, Ll. Marti, K. M. Tsui, M. R. Vagins, J. Xia, S. Izumiyama, M. Kuze, R. Matsumoto, K. Terada, R. Asaka, M. Ishitsuka, M. Shinoki, M. Sugo, M. Wako, T. Yoshida, Y. Nakano, F. Cormier, R. Gaur, V. Gousy-Leblanc, M. Hartz, A. Konaka, X. Li, B. R. Smithers, S. Chen, Y. Wu, B. D. Xu, A. Q. Zhang, B. Zhang, M. Girgus, P. Govindaraj, M. Posiadala-Zezula, Y. S. Prabhu, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, S. Amanai, C. Bronner, D. Horiguchi, A. Minamino, Y. Sasaki, R. Shibayama, R. Shimamura

    Physical Review D   112 ( 9 )   2025.11

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    We searched for bound neutron decay via n → ν ¯ + K 0 predicted by the grand unified theories in 0.401     Mton · years exposure of all pure water phases in the Super-Kamiokande detector. About 4.4 times more data than in the previous search have been analyzed by a new method including a spectrum fit to kaon invariant mass distributions. No significant data excess has been observed in the signal regions. As a result of this analysis, we set a lower limit of 7.8 × 10 32     years on the neutron lifetime at a 90% confidence level.

    DOI: 10.1103/thqt-8fp1

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/thqt-8fp1/fulltext

  • Signal selection and model-independent extraction of the neutrino neutral-current single π+ cross section with the T2K experiment

    K. Abe, S. Abe, R. Akutsu, H. Alarakia-Charles, Y. I. Alj Hakim, S. Alonso Monsalve, L. Anthony, S. Aoki, K. A. Apte, T. Arai, T. Arihara, S. Arimoto, Y. Ashida, E. T. Atkin, N. Babu, V. Baranov, G. J. Barker, G. Barr, D. Barrow, P. Bates, L. Bathe-Peters, M. Batkiewicz-Kwasniak, N. Baudis, V. Berardi, L. Berns, S. Bhattacharjee, A. Blanchet, A. Blondel, S. Bolognesi, S. Bordoni, S. B. Boyd, C. Bronner, A. Bubak, M. Buizza Avanzini, J. A. Caballero, F. Cadoux, N. F. Calabria, S. Cao, S. Cap, D. Carabadjac, S. L. Cartwright, M. P. Casado, M. G. Catanesi, J. Chakrani, A. Chalumeau, A. Chvirova, G. Collazuol, F. Cormier, A. A. L. Craplet, A. Cudd, D. D’ago, C. Dalmazzone, T. Daret, P. Dasgupta, C. Davis, Yu. I. Davydov, G. De Rosa, T. Dealtry, C. Densham, A. Dergacheva, R. Dharmapal Banerjee, F. Di Lodovico, G. Diaz Lopez, S. Dolan, D. Douqa, T. A. Doyle, O. Drapier, K. E. Duffy, J. Dumarchez, P. Dunne, K. Dygnarowicz, A. Eguchi, J. Elias, S. Emery-Schrenk, G. Erofeev, A. Ershova, G. Eurin, D. Fedorova, S. Fedotov, M. Feltre, L. Feng, D. Ferlewicz, A. J. Finch, M. D. Fitton, C. Forza, M. Friend, Y. Fujii, Y. Fukuda, Y. Furui, J. García-Marcos, A. C. Germer, L. Giannessi, C. Giganti, V. Glagolev, M. Gonin, R. González Jiménez, J. González Rosa, E. A. G. Goodman, K. Gorshanov, P. Govindaraj, M. Grassi, M. Guigue, F. Y. Guo, D. R. Hadley, S. Han, D. A. Harris, R. J. Harris, T. Hasegawa, C. M. Hasnip, S. Hassani, N. C. Hastings, Y. Hayato, I. Heitkamp, D. Henaff, Y. Hino, J. Holeczek, A. Holin, T. Holvey, N. T. Hong Van, T. Honjo, M. C. F. Hooft, K. Hosokawa, J. Hu, A. K. Ichikawa, K. Ieki, M. Ikeda, T. Ishida, M. Ishitsuka, A. Izmaylov, N. Jachowicz, S. J. Jenkins, C. Jesús-Valls, M. Jia, J. J. Jiang, J. Y. Ji, T. P. Jones, P. Jonsson, S. Joshi, M. Kabirnezhad, A. C. Kaboth, H. Kakuno, J. Kameda, S. Karpova, V. S. Kasturi, Y. Kataoka, T. Katori, Y. Kawamura, M. Kawaue, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, S. King, V. Kiseeva, J. Kisiel, A. Klustová, L. Kneale, H. Kobayashi, L. Koch, S. Kodama, M. Kolupanova, A. Konaka, L. L. Kormos, Y. Koshio, K. Kowalik, Y. Kudenko, Y. Kudo, A. Kumar Jha, R. Kurjata, V. Kurochka, T. Kutter, L. Labarga, M. Lachat, K. Lachner, J. Lagoda, S. M. Lakshmi, M. Lamers James, A. Langella, D. H. Langridge, J.-F. Laporte, D. Last, N. Latham, M. Laveder, M. Lawe, D. Leon Silverio, S. Levorato, S. V. Lewis, B. Li, C. Lin, R. P. Litchfield, S. L. Liu, W. Li, A. Longhin, A. Lopez Moreno, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, K. K. Mahtani, M. Mandal, S. Manly, A. D. Marino, D. G. R. Martin, D. A. Martinez Caicedo, L. Martinez, M. Martini, T. Matsubara, R. Matsumoto, V. Matveev, C. Mauger, K. Mavrokoridis, N. McCauley, K. S. McFarland, J. McKean, A. Mefodiev, G. D. Megias, L. Mellet, M. Mezzetto, S. Miki, V. Mikola, E. W. Miller, A. Minamino, O. Mineev, S. Mine, J. Mirabito, M. Miura, S. Moriyama, S. Moriyama, P. Morrison, Th. A. Mueller, D. Munford, A. Muñoz, L. Munteanu, Y. Nagai, T. Nakadaira, K. Nakagiri, M. Nakahata, Y. Nakajima, K. D. Nakamura, Y. Nakano, S. Nakayama, T. Nakaya, K. Nakayoshi, C. E. R. Naseby, D. T. Nguyen, V. Q. Nguyen, K. Niewczas, S. Nishimori, Y. Nishimura, Y. Noguchi, T. Nosek, F. Nova, J. C. Nugent, H. M. O’Keeffe, L. O’Sullivan, R. Okazaki, W. Okinaga, K. Okumura, T. Okusawa, N. Onda, N. Ospina, L. Osu, Y. Oyama, V. Paolone, J. Pasternak, M. Pfaff, L. Pickering, B. Popov, A. J. Portocarrero Yrey, M. Posiadala-Zezula, Y. S. Prabhu, H. Prasad, F. Pupilli, B. Quilain, P. T. Quyen, E. Radicioni, B. Radics, M. A. Ramirez, R. Ramsden, P. N. Ratoff, M. Reh, G. Reina, C. Riccio, D. W. Riley, E. Rondio, S. Roth, N. Roy, A. Rubbia, L. Russo, A. Rychter, W. Saenz, K. Sakashita, F. Sánchez, E. M. Sandford, Y. Sato, T. Schefke, C. M. Schloesser, K. Scholberg, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, T. Sekiya, D. Seppala, D. Sgalaberna, A. Shaikhiev, M. Shiozawa, Y. Shiraishi, A. Shvartsman, N. Skrobova, K. Skwarczynski, D. Smyczek, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, A. J. Speers, R. Spina, A. Srivastava, P. Stowell, Y. Stroke, I. A. Suslov, A. Suzuki, S. Y. Suzuki, M. Tada, S. Tairafune, A. Takeda, Y. Takeuchi, H. K. Tanaka, H. Tanigawa, V. V. Tereshchenko, N. Thamm, N. Tran, T. Tsukamoto, M. Tzanov, Y. Uchida, M. Vagins, M. Varghese, I. Vasilyev, G. Vasseur, E. Villa, U. Virginet, T. Vladisavljevic, T. Wachala, D. Wakabayashi, H. T. Wallace, J. G. Walsh, L. Wan, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, K. Wood, C. Wret, J. Xia, K. Yamamoto, T. Yamamoto, Y. Yang, T. Yano, N. Yershov, U. Yevarouskaya, M. Yokoyama, Y. Yoshimoto, N. Yoshimura, R. Zaki, A. Zalewska, J. Zalipska, G. Zarnecki, J. Zhang, X. Y. Zhao, H. Zheng, H. Zhong, T. Zhu, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos

    Physical Review D   112 ( 7 )   2025.10

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    This article presents a study of single π + production in neutrino neutral-current interactions ( NC 1 π + ) using the FGD1 hydrocarbon target of the ND280 detector of the T2K experiment. We report the largest sample of such events selected by any experiment, providing the first new data for this channel in over four decades and the first using a sub-GeV neutrino flux. The signal selection strategy and its performance are detailed together with validations of a robust cross section extraction methodology. The measured flux-averaged integrated cross-section is σ = ( 6.07 ± 1.22 ) × 10 − 41     cm 2 / nucleon , 1.3 σ above the NEUT v5.4.0 expectation.

    DOI: 10.1103/wcn1-4tyl

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  • First Measurement of the Electron-Neutrino Charged-Current Pion Production Cross Section on Carbon with the T2K Near Detector

    K. Abe, S. Abe, R. Akutsu, H. Alarakia-Charles, Y. I. Alj Hakim, S. Alonso Monsalve, L. Anthony, S. Aoki, K. A. Apte, T. Arai, T. Arihara, S. Arimoto, Y. Ashida, E. T. Atkin, N. Babu, V. Baranov, G. J. Barker, G. Barr, D. Barrow, P. Bates, L. Bathe-Peters, M. Batkiewicz-Kwasniak, N. Baudis, V. Berardi, L. Berns, S. Bhattacharjee, A. Blanchet, A. Blondel, P. M. M. Boistier, S. Bolognesi, S. Bordoni, S. B. Boyd, C. Bronner, A. Bubak, M. Buizza Avanzini, J. A. Caballero, F. Cadoux, N. F. Calabria, S. Cao, S. Cap, D. Carabadjac, S. L. Cartwright, M. P. Casado, M. G. Catanesi, J. Chakrani, A. Chalumeau, D. Cherdack, A. Chvirova, J. Coleman, G. Collazuol, F. Cormier, A. A. L. Craplet, A. Cudd, D. D’ago, C. Dalmazzone, T. Daret, P. Dasgupta, C. Davis, Yu. I. Davydov, P. de Perio, G. De Rosa, T. Dealtry, C. Densham, A. Dergacheva, R. Dharmapal Banerjee, F. Di Lodovico, G. Diaz Lopez, S. Dolan, D. Douqa, T. A. Doyle, O. Drapier, K. E. Duffy, J. Dumarchez, P. Dunne, K. Dygnarowicz, A. Eguchi, J. Elias, S. Emery-Schrenk, G. Erofeev, A. Ershova, G. Eurin, D. Fedorova, S. Fedotov, M. Feltre, L. Feng, D. Ferlewicz, A. J. Finch, M. D. Fitton, C. Forza, M. Friend, Y. Fujii, Y. Fukuda, Y. Furui, J. García-Marcos, A. C. Germer, L. Giannessi, C. Giganti, M. Girgus, V. Glagolev, M. Gonin, R. González Jiménez, J. González Rosa, E. A. G. Goodman, K. Gorshanov, P. Govindaraj, M. Grassi, M. Guigue, F. Y. Guo, D. R. Hadley, S. Han, D. A. Harris, R. J. Harris, T. Hasegawa, C. M. Hasnip, S. Hassani, N. C. Hastings, Y. Hayato, I. Heitkamp, D. Henaff, Y. Hino, J. Holeczek, A. Holin, T. Holvey, N. T. Hong Van, T. Honjo, M. C. F. Hooft, K. Hosokawa, J. Hu, A. K. Ichikawa, K. Ieki, M. Ikeda, T. Ishida, M. Ishitsuka, H. Ito, S. Ito, A. Izmaylov, N. Jachowicz, S. J. Jenkins, C. Jesús-Valls, M. Jia, J. J. Jiang, J. Y. Ji, T. P. Jones, P. Jonsson, S. Joshi, M. Kabirnezhad, A. C. Kaboth, H. Kakuno, J. Kameda, S. Karpova, V. S. Kasturi, Y. Kataoka, T. Katori, A. Kawabata, Y. Kawamura, M. Kawaue, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, S. King, V. Kiseeva, J. Kisiel, A. Klustová, L. Kneale, H. Kobayashi, L. Koch, S. Kodama, M. Kolupanova, A. Konaka, L. L. Kormos, Y. Koshio, K. Kowalik, Y. Kudenko, Y. Kudo, A. Kumar Jha, R. Kurjata, V. Kurochka, T. Kutter, L. Labarga, M. Lachat, K. Lachner, J. Lagoda, S. M. Lakshmi, M. Lamers James, A. Langella, D. H. Langridge, J.-F. Laporte, D. Last, N. Latham, M. Laveder, L. Lavitola, M. Lawe, D. Leon Silverio, S. Levorato, S. V. Lewis, B. Li, C. Lin, R. P. Litchfield, S. L. Liu, W. Li, A. Longhin, A. Lopez Moreno, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, K. K. Mahtani, S. Manly, A. D. Marino, D. G. R. Martin, D. A. Martinez Caicedo, L. Martinez, M. Martini, T. Matsubara, R. Matsumoto, V. Matveev, C. Mauger, K. Mavrokoridis, N. McCauley, K. S. McFarland, C. McGrew, J. McKean, A. Mefodiev, G. D. Megias, L. Mellet, C. Metelko, M. Mezzetto, S. Miki, V. Mikola, E. W. Miller, A. Minamino, O. Mineev, S. Mine, J. Mirabito, M. Miura, S. Moriyama, S. Moriyama, P. Morrison, Th. A. Mueller, D. Munford, A. Muñoz, L. Munteanu, Y. Nagai, T. Nakadaira, K. Nakagiri, M. Nakahata, Y. Nakajima, K. D. Nakamura, A. Nakano, Y. Nakano, S. Nakayama, T. Nakaya, K. Nakayoshi, C. E. R. Naseby, D. T. Nguyen, V. Q. Nguyen, K. Niewczas, S. Nishimori, Y. Nishimura, Y. Noguchi, T. Nosek, F. Nova, J. C. Nugent, H. M. O’Keeffe, L. O’Sullivan, R. Okazaki, W. Okinaga, K. Okumura, T. Okusawa, N. Onda, N. Ospina, L. Osu, N. Otani, Y. Oyama, V. Paolone, J. Pasternak, D. Payne, M. Pfaff, L. Pickering, B. Popov, A. J. Portocarrero Yrey, M. Posiadala-Zezula, Y. S. Prabhu, H. Prasad, F. Pupilli, B. Quilain, P. T. Quyen, E. Radicioni, B. Radics, M. A. Ramirez, R. Ramsden, P. N. Ratoff, M. Reh, G. Reina, C. Riccio, D. W. Riley, E. Rondio, S. Roth, N. Roy, A. Rubbia, L. Russo, A. Rychter, W. Saenz, K. Sakashita, S. Samani, F. Sánchez, E. M. Sandford, Y. Sato, T. Schefke, K. Scholberg, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, T. Sekiya, D. Seppala, D. Sgalaberna, A. Shaikhiev, M. Shiozawa, Y. Shiraishi, A. Shvartsman, N. Skrobova, K. Skwarczynski, D. Smyczek, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, A. J. Speers, R. Spina, A. Srivastava, P. Stowell, Y. Stroke, I. A. Suslov, A. Suzuki, S. Y. Suzuki, M. Tada, S. Tairafune, A. Takeda, Y. Takeuchi, K. Takeya, H. K. Tanaka, H. Tanigawa, V. V. Tereshchenko, N. Thamm, C. Touramanis, N. Tran, T. Tsukamoto, M. Tzanov, Y. Uchida, M. Vagins, S. Valder, M. Varghese, I. Vasilyev, G. Vasseur, E. Villa, U. Virginet, T. Vladisavljevic, T. Wachala, S.-i. Wada, D. Wakabayashi, H. T. Wallace, J. G. Walsh, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, K. Wood, C. Wret, J. Xia, K. Yamamoto, T. Yamamoto, C. Yanagisawa, Y. Yang, T. Yano, N. Yershov, U. Yevarouskaya, M. Yokoyama, Y. Yoshimoto, N. Yoshimura, R. Zaki, A. Zalewska, J. Zalipska, G. Zarnecki, J. Zhang, X. Y. Zhao, H. Zheng, H. Zhong, T. Zhu, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos

    Physical Review Letters   135 ( 15 )   2025.10

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    The T2K Collaboration presents the first measurement of electron neutrino-induced charged-current pion production on a predominantly carbon target in a restricted kinematical phase space. This is performed using data from the 2.5° off-axis near detector, ND280. The differential cross sections with respect to the outgoing electron and pion kinematics, in addition to the total flux-integrated cross section, are obtained. Comparisons between the measured and predicted cross-section results using the eut, enie, and uro Monte Carlo event generators are presented. The measured total flux-integrated cross section is [ 2.52 ± 0.52 ( stat ) ± 0.30 ( syst ) ] × 10 − 39     cm 2   nucleon − 1 , which is lower than the event generator predictions.

    DOI: 10.1103/klhv-7t6h

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  • Hyper-Kamiokande: Neutrino Astrophysics and Status

    Takatomi Yano, Ko Abe, Mohamed Taha Afif, Rachid Ahl Laamara, Hiroaki Aihara, Ali Ajmi, Ryosuke Akutsu, Igor Genadievich Alekseev, Yassine Alj Hakim, Saul Alonso Monsalve, Emanuele Amato, Fabrizio Ameli, Lauren H.V. Anthony, Akito Araya, Alexander Arguello Quiroga, Yoichi Asaoka, Yosuke Ashida, Volodymyr Aushev, Francisco Ballester Merelo, Mauricio Barbi, Giles Barr, Marcela Batkiewicz-Kwasniak, Driss Benchekroun, Vincenzo Berardi, Lukas Berns, Sampa Bhadra, Nahid Bhuiyan, Jianming Bian, Davide Bianco, Adrien Blanchet, Alain Blondel, Sara Bolognesi, Laura Bonavera, Stefania Bordoni, Debanjan Bose, Steve Boyd, Cristiano Bozza, Alessandro Bravar, Leonel Bravo, Christophe Bronner, Arkadiusz Bubak, Andrzej Buchowicz, Margherita Buizza Avanzini, George Burton, Francesco Saverio Cafagna, Nicola Fulvio Calabria, José María Calvo Mozota, Son Cao, Susan Cartwright, Maria Pilar Casado Lechuga, Gabriella Catanesi, Susana Cebrian, El Mahjoub Chakir, Sovan Chakrabarty, June Ho Choi, Sandhya Choubey, Edgar Alonso Chucuan Martinez, Ladislav Chytka, Laura Cid Barrio, Marek Cieslar, Jon Coleman, Gianmaria Collazuol, Laurence Cook, Felix Cormier, Diego Costas-Rodríguez, Alie Craplet, Saul Cuen-Rochin, Mikhail Danilov, Francisco Javier De Cos, Eduardo de la Fuente Acosta, Gianfranca De Rosa, Thomas Dealtry, Massimo Della Valle, Christopher Densham, Anna Dergacheva, Moon Moon Devi, Francesca Di Lodovico, Antonio Di Nitto, Gonzalo Díaz López, Till Conrad Dieminger, Magdalena Dobrzynska, Tadeas Dohnal, Tristan Doyle, Evangelia Drakopoulou, Olivier Drapier, Carlos Duarte Galvan, Jacques Dumarchez, Mathias El Baz, John Ellis, Ryan Elmansali, Sandrine Emery, Anna Ershova, Arman Esmaili, Christopher Edgar Falcon Anaya, Luis Eduardo Falcon Morales, Jack Fannon, Sergei Fedotov, Matteo Feltre, Jiahui Feng, Daniel Ferlewicz, Pablo Fernández-Menéndez, Paola Ferrario, Alex Finch, Chad Finley, Arturo Fiorentini, Michael Fitton, Matthew Franks, Megan Friend, Yoshiaki Fujii, Yoshiyuki Fukuda, Luigi Antonio Fusco, Romain Gaior, Grzegorz Galiński, Rodrigo Gamboa Goñi, Jingyuan Gao, Francisco Garcia Riesgo, Chandrasekhar Garde, Rhea Gaur, Claudio GIGANTI, Vladimir Gligorov, Olga Gogota, Mohit Gola, Juan José Gomez-Cadenas, Michel Gonin, Joaquin Gonzalez-Nuevo, Razvan Gornea, Sanshiro Goto, Mohamed Gouighri, Javier Gracia Rodriguez, Kevin Graham, Fabiana Gramegna, Marco Grassi, Hafid Griguer, Mathieu Guigue, David Hadley, Ashot Hambardzumyan, Masayuki Harada, Mark Hartz, Eric Harvey-Fishenden, Samira Hassani, Nicholas Hastings, Shingo Hayashida, Yoshinari Hayato, Karen Hayrapetyan, Jose Angel Hernando Morata, Vicente Herrero Bosch, Katsuki Hiraide, Jacek Holeczek, Anna Holin, Kotoyo Hoshina, Keishi Hosokawa, Abdeslam Hoummada, Klas Hultqvist, Atsuko Ichikawa, Kei Ieki, Motoyasu Ikeda, Ana Sofia Inacio, Ara Ioannisian, Taku Ishida, Koji Ishidoshiro, Hirokazu ISHINO, Masaki Ishitsuka, Hiroshi Ito, Yoshitaka Itow, Alexander Izmaylov, Blair Jamieson, Jee-Seung Jang, Sam Jenkins, César Jesús-Valls, Hyon-Suk Jo, Tom Jones, Per JONSSON, Kyung Kwang Joo, Shivam Joshi, Takaaki Kajita, Hidekazu Kakuno, Leonidas Kalousis, Jun Kameda, Yasuyuki Kano, Dean Karlen, Yosuke Kataoka, Aitaro Kato, Teppei Katori, Narine Kazarian, Marat Khabibullin, Alexei Khotjantsev, Tatsuya Kikawa, Jae Yool Kim, Sophie King, Jan KISIEL, Liz Kneale, Misaki Kobayashi, Takashi Kobayashi, Luan Koerich, Nikolay Kolev, Akira Konaka, Laura Kormos, Umut Kose, Yusuke Koshio, Tymoteusz Kosinski, Konstantin Kouzakov, Katarzyna Kowalik, Robert Kralik, Leonid Kravchuk, Alexander Kryukov, Yury Kudenko, Atul Kulkarni, Tetsuro Kumita, Robert Kurjata, Thomas Kutter, Masahiro Kuze, Jiri Kvita, Kyujin Kwak, EunHyang Kwon, Luis Labarga, Katharina Lachner, Justyna Lagoda, Gianluca Lamanna, Menai Lamers James, Aurora Langella, Jean-Francois Laporte, Nicholas Latham, Luigi Lavitola, Matthew Lawe, Jik Lee, Rupert Leitner, Stefano Levorato, Botao Li, Qiaodan Li, Xiaoyue Li, Intaek Lim, Thomas Lindner, Phillip Litchfield, Kenneth Long, Andrea Longhin, Francisco Lopez, Andres Lopez Moreno, Xianguo Lu, Lucio Ludovici, Thorsten LUX, Lorenzo Magaletti, Jakkapu Mahesh, Pere Maimi Vert, Yasuhiro Makida, Michal Malinsky, Maitrayee Mandal, Yuta Mandokoro, Mahnoor Mansoor, Camillo Mariani, Christos Markou, Kai Martens, Lluis Marti, John Fraser Martin, Marco Martini, Janusz Marzec, Tsunayuki Matsubara, Ryo Matsumoto, Michal Matusiak, Krzysztof Mazurek, Neil McCauley, Alexander Mefodiev, William Melbourne, Lucile Mellet, David Mendez-Esteban, Hiroaki Menjo, Giannina Dalle Mese Zavala, Mauro Mezzetto, Jost Migenda, Pasquale Migliozzi, Shintaro Miki, Veera Mikola, Ewan Miller, Akihiro Minamino, Shuniche Mine, Oleg Mineev, Makoto Miura, Reetanjali Moharana, Carlos Maximiliano Mollo, Tanima Mondal, Francesc Monrabal, Chang-Seong Moon, Dong Ho Moon, Francisco José Mora Mas, Luca Morescalchi, Shigetaka Moriyama, Thomas A. Mueller, Takeshi Nakadaira, Kota NAKAGIRI, Masayuki NAKAHATA, Syunichi Nakai, Yasuhiro Nakajima, Kenzo Nakamura, Kiseki Nakamura, Yuuki Nakano, Tsuyoshi Nakaya, Shoei Nakayama, Lucas Nascimento Machado, Charles Naseby, Kotaro Ninomiya, Yasuhiro Nishimura, Yohei Noguchi, Tomas Nosek, Federico Nova, Libor Nozka, John Columba Nugent, Hiroshi Nunokawa, Evan O'Connor, Marcus O'Flaherty, Helen O'Keeffe, Erin O'Sullivan, Wojciech Obrębski, Pedro Ochoa-Ricoux, Toru Ogitsu, Kimihiro Okumura, Nataly Ospina Escobar, Michal Ostrowski, Yuichi Oyama, Myoung Youl Pac, Pascal Paganini, Joaquim Palacio, Jungsic Park, Jaroslaw Pasternak, Cosimo Pastore, Grzegorz Pastuszak, Caleb Pate, Matej Pavin, David Payne, Jorge Pelegrin Mosquera, Carlos Pena Garay, Patrick de Perio, Jacopo Pinzino, Steve Playfer, Barry W. Pointon, Eleonora Ponticelli, Artem Popov, Boris Popov, Magdalena Posiadala-Zezula, Guillaume Pronost, Nick Prouse, Benjamin Quilain, Emilio Radicioni, Paweł Rajda, Joshua Renner, Marco Rescigno, Giulia Ricciardi, Ben Richards, Kate Richards, Rudolph Rogly, Maria Fernanda Romo-Fuentes, Ewa Rondio, Bedrich Roskovec, Stefan Roth, Carsten Rott, Andre Rubbia, Alan Cosimo Ruggeri, Stefano Russo, Andrzej Rychter, Dongsu Ryu, William Saenz, Ken Sakashita, Soniya Samani, Federico Andrés Sánchez, María Luisa Sánchez Rodríguez, Ellen Sandford, Jesús Daniel Santos Rodríguez, Prantik Sarmah, Kazufumi Sato, Mark Scott, Yoshihiro Seiya, Tetsuro Sekiguchi, Hiroyuki Sekiya, Ji-Woong Seo, Davide Sgalaberna, Itaru Shimizu, Chang Dong Shin, Masato Shiozawa, Alexander Shvartsman, Andreino Simonelli, Nataliya Skrobova, Benjamin Smithers, Michael Smy, Jan SOBCZYK, Henry W. Sobel, Paul Soler, Marco Stanislao Sozzi, Roberto Spina, Bernardino Spisso, Patrick Spradlin, Konstantin Stankevich, Dimitris Stavropoulos, Lukasz Stawarz, Patrick Stowell, Alexander Studenikin, Sergio Luis Suárez Gómez, Mariusz Suchenek, Yudai Suwa, Atsumu Suzuki, So Suzuki, Yoichiro Suzuki, Dmitry Svirida, Masaru Tada, Atsushi Takeda, Yasuhiro Takemoto, Akimichi Taketa, Yasuo Takeuchi, Volodymyr Takhistov, HIDEKAZU TANAKA, Hiroyuki Tanaka, Manobu Tanaka, Hikaru Tanigawa, Takuya Tashiro, Matthew D. Thiesse, Erich Thrane, José Francisco Toledo Alarcón, Alejandro Kadsumi Tomatani Sánchez, Ngoc Tran, Ka Ming Tsui, Toshifumi Tsukamoto, Martin Tzanov, Yoshi Uchida, Phillip Urquijo, Mark Vagins, Sammy Valder, Oriol Vallmajo, Georges Vasseur, Billy Vinning, Daniele Vivolo, Tomislav Vladisavljevic, Robert Vogelaar, Maxim Vyalkov, Tomasz Wąchała, Dave Wark, Roger Wendell, Jeanne Wilson, Marcin Wojciechowski, Slawomir Wronka, Johannes Wuethrich, Junjie Xia, Zhenxiong Xie, Kazuhiro Yamamoto, Byeongsu Yang, Nikolai Yershov, Masashi Yokoyama, Jonghee Yoo, Intae Yu, Bryan Zaldivar, Joanna Zalipska, Krzysztof Zaremba, Grzegorz Zarnecki, Xingyu Zhao, Tailin Zhu, Marcin Ziembicki, Krzysztof Ziȩtara, Marco Zito, Stephane Zsoldos

    Proceedings of 39th International Cosmic Ray Conference — PoS(ICRC2025)   1215 - 1215   2025.9

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    Publishing type:Research paper (international conference proceedings)   Publisher:SISSA Medialab  

    DOI: 10.22323/1.501.1215

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  • Measurement of neutron production in atmospheric neutrino interactions at Super-Kamiokande

    S. Han, K. Abe, S. Abe, Y. Asaoka, C. Bronner, M. Harada, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, M. Nakahata, S. Nakayama, Y. Noguchi, G. Pronost, K. Sato, K. Okamoto, H. Sekiya, H. Shiba, K. Shimizu, R. Shinoda, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, T. Yano, T. Kajita, K. Okumura, R. Nishijima, T. Tashiro, T. Tomiya, X. Wang, S. Yoshida, P. Fernandez, L. Labarga, N. Ospina, D. Samudio, B. Zaldivar, B. W. Pointon, C. Yanagisawa, E. Kearns, J. L. Raaf, L. Wan, T. Wester, J. Bian, B. Cortez, N. J. Griskevich, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, M. C. Jang, S. H. Lee, D. H. Moon, R. G. Park, B. S. Yang, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, O. Drapier, A. Giampaolo, A. Ershova, Th. A. Mueller, A. D. Santos, P. Paganini, C. Quach, R. Rogly, T. Nakamura, J. S. Jang, L. N. Machado, F. P. Soler, J. G. Learned, K. Choi, N. Iovine, S. Cao, L. H. V. Anthony, D. Martin, N. W. Prouse, M. Scott, Y. Uchida, A. A. Sztuc, V. Berardi, N. F. Calabria, M. G. Catanesi, E. Radicioni, A. Langella, G. De Rosa, G. Collazuol, M. Feltre, F. Iacob, M. Mattiazzi, L. Ludovici, M. Gonin, L. Périssé, B. Quilain, C. Fujisawa, S. Horiuchi, A. Kawabata, M. Kobayashi, Y. M. Liu, Y. Maekawa, Y. Nishimura, R. Okazaki, R. Akutsu, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, A. Portocarrero Yrey, K. Sakashita, T. Sekiguchi, T. Tsukamoto, N. Bhuiyan, G. T. Burton, F. Di Lodovico, J. Gao, A. Goldsack, T. Katori, J. Migenda, R. M. Ramsden, Z. Xie, S. Zsoldos, T. Sone, A. T. Suzuki, Y. Takagi, Y. Takeuchi, S. Wada, H. Zhong, J. Feng, L. Feng, J. Hikida, J. R. Hu, Z. Hu, M. Kawaue, T. Kikawa, M. Mori, T. Nakaya, T. V. Ngoc, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, A. Tarrant, P. Mehta, M. Fanì, M. J. Wilking, Y. Fukuda, Y. Itow, H. Menjo, Y. Yoshioka, K. Ninomiya, J. Lagoda, S. M. Lakshmi, M. Mandal, P. Mijakowski, Y. S. Prabhu, J. Zalipska, M. Jia, J. Jiang, C. K. Jung, W. Shi, K. Hamaguchi, Y. Hino, H. Ishino, Y. Koshio, F. Nakanishi, S. Sakai, T. Tada, T. Tano, T. Ishizuka, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, S. Jung, J. Y. Yang, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, T. Peacock, P. Stowell, M. D. Thiesse, L. F. Thompson, S. T. Wilson, H. Okazawa, S. M. Lakshmi, S. B. Kim, E. Kwon, M. W. Lee, J. W. Seo, I. Yu, A. K. Ichikawa, K. D. Nakamura, S. Tairafune, K. Nishijima, A. Eguchi, S. Goto, S. Kodama, Y. Mizuno, T. Muro, K. Nakagiri, Y. Nakajima, S. Shima, N. Taniuchi, E. Watanabe, M. Yokoyama, P. de Perio, S. Fujita, C. Jesús-Valls, K. Martens, Ll. Marti, K. M. Tsui, M. R. Vagins, J. Xia, M. Kuze, S. Izumiyama, R. Matsumoto, K. Terada, R. Asaka, M. Ishitsuka, H. Ito, Y. Ommura, N. Shigeta, M. Shinoki, M. Sugo, M. Wako, K. Yamauchi, T. Yoshida, Y. Nakano, F. Cormier, R. Gaur, V. Gousy-Leblanc, M. Hartz, A. Konaka, X. Li, B. R. Smithers, S. Chen, Y. Wu, B. D. Xu, A. Q. Zhang, B. Zhang, M. Girgus, P. Govindaraj, M. Posiadala-Zezula, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, S. Amanai, D. Hamaguchi, A. Minamino, Y. Sasaki, R. Shibayama, R. Shimamura, S. Suzuki

    Physical Review D   112 ( 1 )   2025.7

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    We present measurements of total neutron production from atmospheric neutrino interactions in water, analyzed as a function of electron-equivalent visible energy over a range of 30 MeV to 10 GeV. These results are based on 4,270 days of data collected by Super-Kamiokande, including 564 days with 0.011 wt% gadolinium added to enhance neutron detection. Neutron signal selection is based on a neural network trained on simulation, with its performance validated using an Am/Be neutron point source. The measurements are compared to predictions from neutrino event generators combined with various hadron-nucleus interaction models, which include an intranuclear cascade model and a nuclear deexcitation model. We observe significant variations in the predictions depending on the choice of hadron-nucleus interaction model. We discuss key factors that contribute to describing our data, such as in-medium effects in the intranuclear cascade and the accuracy of statistical evaporation modeling.

    DOI: 10.1103/4d71-d69k

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/4d71-d69k/fulltext

  • First Joint Oscillation Analysis of Super-Kamiokande Atmospheric and T2K Accelerator Neutrino Data

    K. Abe, S. Abe, C. Bronner, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, M. Nakahata, Y. Nakano, S. Nakayama, Y. Noguchi, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, H. Tanaka, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, S. Yoshida, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, B. W. Pointon, E. Kearns, J. Mirabito, J. L. Raaf, L. Wan, T. Wester, J. Bian, N. J. Griskevich, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, M. C. Jang, S. H. Lee, D. H. Moon, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, O. Drapier, A. Giampaolo, Th. A. Mueller, A. D. Santos, P. Paganini, B. Quilain, R. Rogly, T. Nakamura, J. S. Jang, L. N. Machado, J. G. Learned, K. Choi, N. Iovine, S. Cao, L. H. V. Anthony, D. Martin, N. W. Prouse, M. Scott, Y. Uchida, V. Berardi, N. F. Calabria, M. G. Catanesi, E. Radicioni, A. Langella, G. De Rosa, G. Collazuol, M. Feltre, F. Iacob, M. Mattiazzi, L. Ludovici, M. Gonin, L. Périssé, G. Pronost, C. Fujisawa, S. Horiuchi, M. Kobayashi, Y. M. Liu, Y. Maekawa, Y. Nishimura, R. Okazaki, R. Akutsu, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, A. Portocarrero Yrey, K. Sakashita, T. Sekiguchi, T. Tsukamoto, N. Bhuiyan, G. T. Burton, F. Di Lodovico, J. Gao, A. Goldsack, T. Katori, J. Migenda, R. M. Ramsden, Z. Xie, S. Zsoldos, A. T. Suzuki, Y. Takagi, Y. Takeuchi, H. Zhong, J. Feng, L. Feng, J. R. Hu, Z. Hu, M. Kawaue, T. Kikawa, M. Mori, T. Nakaya, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, P. Mehta, A. Tarrant, M. J. Wilking, Y. Fukuda, Y. Itow, H. Menjo, K. Ninomiya, Y. Yoshioka, J. Lagoda, M. Mandal, P. Mijakowski, Y. S. Prabhu, J. Zalipska, M. Jia, J. Jiang, W. Shi, C. Yanagisawa, M. Harada, Y. Hino, H. Ishino, Y. Koshio, F. Nakanishi, S. Sakai, T. Tada, T. Tano, T. Ishizuka, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, S. Jung, B. S. Yang, J. Y. Yang, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, M. D. Thiesse, L. F. Thompson, S. T. Wilson, H. Okazawa, S. M. Lakshmi, S. B. Kim, E. Kwon, J. W. Seo, I. Yu, A. K. Ichikawa, K. D. Nakamura, S. Tairafune, K. Nishijima, A. Eguchi, K. Nakagiri, Y. Nakajima, S. Shima, N. Taniuchi, E. Watanabe, M. Yokoyama, P. de Perio, S. Fujita, C. Jesús-Valls, K. Martens, K. M. Tsui, M. R. Vagins, J. Xia, S. Izumiyama, M. Kuze, R. Matsumoto, K. Terada, R. Asaka, M. Ishitsuka, H. Ito, Y. Ommura, N. Shigeta, M. Shinoki, K. Yamauchi, T. Yoshida, R. Gaur, V. Gousy-Leblanc, M. Hartz, A. Konaka, X. Li, S. Chen, B. D. Xu, Y. Wu, A. Q. Zhang, B. Zhang, M. Posiadala-Zezula, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, S. Amanai, Ll. Marti, A. Minamino, R. Shibayama, R. Shimamura, S. Suzuki, K. Abe, S. Abe, N. Akhlaq, R. Akutsu, H. Alarakia-Charles, A. Ali, Y. I. Alj Hakim, S. Alonso Monsalve, C. Andreopoulos, L. Anthony, M. Antonova, S. Aoki, K. A. Apte, T. Arai, T. Arihara, S. Arimoto, Y. Asada, Y. Ashida, E. T. Atkin, N. Babu, M. Barbi, G. J. Barker, G. Barr, D. Barrow, P. Bates, M. Batkiewicz-Kwasniak, V. Berardi, L. Berns, S. Bhadra, A. Blanchet, A. Blondel, S. Bolognesi, S. Bordoni, S. B. Boyd, A. Bravar, C. Bronner, A. Bubak, M. Buizza Avanzini, J. A. Caballero, N. F. Calabria, S. Cao, D. Carabadjac, A. J. Carter, S. L. Cartwright, M. P. Casado, M. G. Catanesi, A. Cervera, J. Chakrani, A. Chalumeau, D. Cherdack, P. S. Chong, A. Chvirova, M. Cicerchia, J. Coleman, G. Collazuol, L. Cook, F. Cormier, A. Cudd, D. D’ago, C. Dalmazzone, T. Daret, P. Dasgupta, C. Davis, Yu. I. Davydov, A. De Roeck, G. De Rosa, T. Dealtry, C. C. Delogu, C. Densham, A. Dergacheva, R. Dharmapal, F. Di Lodovico, G. Diaz Lopez, S. Dolan, D. Douqa, T. A. Doyle, O. Drapier, K. E. Duffy, J. Dumarchez, P. Dunne, K. Dygnarowicz, A. Eguchi, J. Elias, S. Emery-Schrenk, G. Erofeev, A. Ershova, G. Eurin, D. Fedorova, S. Fedotov, M. Feltre, L. Feng, D. Ferlewicz, A. J. Finch, G. A. Fiorentini Aguirre, G. Fiorillo, M. D. Fitton, J. M. Franco Patiño, M. Friend, Y. Fujii, Y. Fukuda, Y. Furui, L. Giannessi, C. Giganti, V. Glagolev, M. Gonin, J. González Rosa, E. A. G. Goodman, A. Gorin, K. Gorshanov, M. Grassi, M. Guigue, D. R. Hadley, J. T. Haigh, S. Han, D. A. Harris, M. Hartz, T. Hasegawa, S. Hassani, N. C. Hastings, Y. Hayato, I. Heitkamp, D. Henaff, Y. Hino, M. Hogan, J. Holeczek, A. Holin, T. Holvey, N. T. Hong Van, T. Honjo, K. Hosokawa, J. Hu, A. K. Ichikawa, K. Ieki, M. Ikeda, T. Ishida, M. Ishitsuka, A. Izmaylov, M. Jakkapu, B. Jamieson, S. J. Jenkins, C. Jesús-Valls, M. Jia, J. J. Jiang, J. Y. Ji, P. Jonsson, S. Joshi, C. K. Jung, M. Kabirnezhad, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, S. Karpova, S. P. Kasetti, V. S. Kasturi, Y. Kataoka, T. Katori, Y. Kawamura, M. Kawaue, E. Kearns, M. Khabibullin, A. Khotjantsev, T. Kikawa, S. King, V. Kiseeva, J. Kisiel, L. Kneale, H. Kobayashi, T. Kobayashi, L. Koch, S. Kodama, M. Kolupanova, A. Konaka, L. L. Kormos, Y. Koshio, T. Koto, K. Kowalik, Y. Kudenko, Y. Kudo, S. Kuribayashi, R. Kurjata, V. Kurochka, T. Kutter, M. Kuze, M. La Commara, L. Labarga, M. Lachat, K. Lachner, J. Lagoda, S. M. Lakshmi, M. Lamers James, A. Langella, J.-F. Laporte, D. Last, N. Latham, M. Laveder, L. Lavitola, M. Lawe, Y. Lee, D. Leon Silverio, S. Levorato, S. Lewis, C. Lin, R. P. Litchfield, S. L. Liu, W. Li, A. Longhin, K. R. Long, A. Lopez Moreno, L. Ludovici, X. Lu, T. Lux, L. N. Machado, L. Magaletti, K. Mahn, K. K. Mahtani, M. Malek, M. Mandal, S. Manly, A. D. Marino, L. Marti-Magro, D. G. R. Martin, M. Martini, J. F. Martin, T. Maruyama, T. Matsubara, R. Matsumoto, V. Matveev, C. Mauger, K. Mavrokoridis, E. Mazzucato, N. McCauley, K. S. McFarland, C. McGrew, J. McKean, A. Mefodiev, G. D. Megias, P. Mehta, L. Mellet, C. Metelko, M. Mezzetto, S. Miki, E. Miller, A. Minamino, O. Mineev, S. Mine, J. Mirabito, M. Miura, L. Molina Bueno, S. Moriyama, S. Moriyama, P. Morrison, Th. A. Mueller, D. Munford, A. Muñoz, L. Munteanu, K. Nagai, Y. Nagai, T. Nakadaira, K. Nakagiri, M. Nakahata, Y. Nakajima, A. Nakamura, K. Nakamura, K. D. Nakamura, Y. Nakano, S. Nakayama, T. Nakaya, K. Nakayoshi, C. E. R. Naseby, T. V. Ngoc, D. T. Nguyen, V. Q. Nguyen, K. Niewczas, S. Nishimori, Y. Nishimura, Y. Noguchi, T. Nosek, F. Nova, P. Novella, J. C. Nugent, H. M. O’Keeffe, L. O’Sullivan, T. Odagawa, R. Okazaki, W. Okinaga, K. Okumura, T. Okusawa, N. Onda, N. Ospina, L. Osu, Y. Oyama, V. Palladino, V. Paolone, M. Pari, J. Parlone, J. Pasternak, D. Payne, G. C. Penn, D. Pershey, M. Pfaff, L. Pickering, G. Pintaudi, C. Pistillo, B. Popov, A. J. Portocarrero Yrey, K. Porwit, M. Posiadala-Zezula, Y. S. Prabhu, H. Prasad, F. Pupilli, B. Quilain, P. T. Quyen, T. Radermacher, E. Radicioni, B. Radics, M. A. Ramirez, P. N. Ratoff, M. Reh, C. Riccio, E. Rondio, S. Roth, N. Roy, A. Rubbia, L. Russo, A. Rychter, W. Saenz, K. Sakashita, F. Sánchez, Y. Sato, T. Schefke, C. M. Schloesser, K. Scholberg, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, A. Shaikhiev, M. Shiozawa, Y. Shiraishi, A. Shvartsman, N. Skrobova, K. Skwarczynski, D. Smyczek, M. Smy, J. T. Sobczyk, H. Sobel, F. J. P. Soler, A. J. Speers, R. Spina, Y. Stroke, I. A. Suslov, S. Suvorov, A. Suzuki, S. Y. Suzuki, Y. Suzuki, M. Tada, S. Tairafune, A. Takeda, Y. Takeuchi, K. Takifuji, H. K. Tanaka, H. Tanigawa, A. Teklu, V. V. Tereshchenko, N. Thamm, L. F. Thompson, W. Toki, C. Touramanis, T. Tsukamoto, M. Tzanov, Y. Uchida, M. Vagins, D. Vargas, M. Varghese, G. Vasseur, E. Villa, W. G. S. Vinning, U. Virginet, T. Vladisavljevic, T. Wachala, D. Wakabayashi, H. T. Wallace, J. G. Walsh, Y. Wang, L. Wan, D. Wark, M. O. Wascko, A. Weber, R. Wendell, M. J. Wilking, C. Wilkinson, J. R. Wilson, K. Wood, C. Wret, J. Xia, Y.-h. Xu, K. Yamamoto, T. Yamamoto, C. Yanagisawa, G. Yang, T. Yano, K. Yasutome, N. Yershov, U. Yevarouskaya, M. Yokoyama, Y. Yoshimoto, N. Yoshimura, M. Yu, R. Zaki, A. Zalewska, J. Zalipska, K. Zaremba, G. Zarnecki, J. Zhang, X. Y. Zhao, H. Zhong, T. Zhu, M. Ziembicki, E. D. Zimmerman, M. Zito, S. Zsoldos

    Physical Review Letters   134 ( 1 )   2025.1

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    The Super-Kamiokande and T2K Collaborations present a joint measurement of neutrino oscillation parameters from their atmospheric and beam neutrino data. It uses a common interaction model for events overlapping in neutrino energy and correlated detector systematic uncertainties between the two datasets, which are found to be compatible. Using 3244.4 days of atmospheric data and a beam exposure of 19.7 ( 16.3 ) × 10 20 protons on target in (anti)neutrino mode, the analysis finds a 1.9 σ exclusion of C P conservation (defined as J C P = 0 ) and a 1.2 σ exclusion of the inverted mass ordering.

    DOI: 10.1103/physrevlett.134.011801

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  • Differentiable Physics Emulator for Water Cherenkov Detectors

    Junjie Xia, Patrick de Perio, Kazuhiro Terao, Ryo Matsumoto, Ryotaro Tsuchii

    Proceedings of 42nd International Conference on High Energy Physics — PoS(ICHEP2024)   1143 - 1143   2024.12

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    Publishing type:Research paper (international conference proceedings)   Publisher:Sissa Medialab  

    DOI: 10.22323/1.476.1143

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  • Search for proton decay via p→e+η and p→μ+η with a 0.37 Mton-year exposure of Super-Kamiokande

    N. Taniuchi, K. Abe, S. Abe, Y. Asaoka, C. Bronner, M. Harada, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, M. Nakahata, S. Nakayama, Y. Noguchi, G. Pronost, K. Okamoto, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, S. Watanabe, T. Yano, T. Kajita, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, S. Yoshida, G. D. Megias, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, B. W. Pointon, E. Kearns, J. Mirabito, J. L. Raaf, L. Wan, T. Wester, J. Bian, N. J. Griskevich, W. R. Kropp, S. Locke, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, M. C. Jang, J. Y. Kim, S. H. Lee, I. T. Lim, D. H. Moon, R. G. Park, B. S. Yang, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, L. Bernard, A. Coffani, O. Drapier, S. El Hedri, A. Giampaolo, Th. A. Mueller, A. D. Santos, P. Paganini, R. Rogly, T. Nakamura, J. S. Jang, L. N. Machado, J. G. Learned, K. Choi, N. Iovine, S. Cao, L. H. V. Anthony, D. Martin, N. W. Prouse, M. Scott, A. A. Sztuc, Y. Uchida, V. Berardi, N. F. Calabria, M. G. Catanesi, E. Radicioni, A. Langella, G. De Rosa, G. Collazuol, M. Feltre, F. Iacob, M. Lamoureux, M. Mattiazzi, L. Ludovici, M. Gonin, L. Périssé, B. Quilain, C. Fujisawa, S. Horiuchi, M. Kobayashi, Y. M. Liu, Y. Maekawa, Y. Nishimura, R. Okazaki, R. Akutsu, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, A. Portocarrero Yrey, K. Sakashita, T. Sekiguchi, T. Tsukamoto, N. Bhuiyan, T. Boschi, G. T. Burton, F. Di Lodovico, J. Gao, A. Goldsack, T. Katori, J. Migenda, R. M. Ramsden, M. Taani, Z. Xie, S. Zsoldos, Y. Kotsar, H. Ozaki, A. T. Suzuki, Y. Takagi, Y. Takeuchi, S. Yamamoto, H. Zhong, J. Feng, L. Feng, S. Han, J. R. Hu, Z. Hu, M. Kawaue, T. Kikawa, M. Mori, T. Nakaya, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, P. Mehta, A. Tarrant, M. J. Wilking, Y. Fukuda, Y. Itow, H. Menjo, K. Ninomiya, Y. Yoshioka, J. Lagoda, M. Mandal, P. Mijakowski, Y. S. Prabhu, J. Zalipska, M. Jia, J. Jiang, C. K. Jung, W. Shi, C. Yanagisawa, Y. Hino, H. Ishino, S. Ito, H. Kitagawa, Y. Koshio, W. Ma, F. Nakanishi, S. Sakai, T. Tada, T. Tano, T. Ishizuka, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, S. Jung, J. Y. Yang, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, O. Stone, P. Stowell, M. D. Thiesse, L. F. Thompson, S. T. Wilson, H. Okazawa, S. M. Lakshmi, S. B. Kim, E. Kwon, M. W. Lee, J. W. Seo, I. Yu, A. K. Ichikawa, K. D. Nakamura, S. Tairafune, K. Nishijima, M. Koshiba, A. Eguchi, S. Goto, K. Iwamoto, Y. Mizuno, T. Muro, K. Nakagiri, Y. Nakajima, S. Shima, E. Watanabe, M. Yokoyama, P. de Perio, S. Fujita, C. Jesús-Valls, K. Martens, Ll. Marti, K. M. Tsui, M. R. Vagins, J. Xia, S. Izumiyama, M. Kuze, R. Matsumoto, K. Terada, R. Asaka, M. Inomoto, M. Ishitsuka, H. Ito, T. Kinoshita, Y. Ommura, N. Shigeta, M. Shinoki, T. Suganuma, K. Yamauchi, T. Yoshida, Y. Nakano, J. F. Martin, H. A. Tanaka, T. Towstego, R. Gaur, V. Gousy-Leblanc, M. Hartz, A. Konaka, X. Li, S. Chen, Y. Wu, B. D. Xu, A. Q. Zhang, B. Zhang, M. Posiadala-Zezula, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, S. Amanai, A. Minamino, G. Pintaudi, S. Sano, R. Sasaki, R. Shibayama, R. Shimamura, S. Suzuki, K. Wada

    Physical Review D   110 ( 11 )   2024.12

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    A search for proton decay into e + / μ + and a η meson has been performed using data from a 0.373     Mton · year exposure (6050.3 live days) of Super-Kamiokande. Compared to previous searches this work introduces an improved model of the intranuclear η interaction cross section, resulting in a factor of 2 reduction in uncertainties from this source and ∼ 10 % increase in signal efficiency. No significant data excess was found above the expected number of atmospheric neutrino background events resulting in no indication of proton decay into either mode. Lower limits on the proton partial lifetime of 1.4 × 10 34     years for p → e + η and 7.3 × 10 33     years for p → μ + η at the 90% CL were set. These limits are around 1.5 times longer than our previous study and are the most stringent to date.

    Published by the American Physical Society 2024

    DOI: 10.1103/physrevd.110.112011

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  • Measurements of the charge ratio and polarization of cosmic-ray muons with the Super-Kamiokande detector

    H. Kitagawa, T. Tada, K. Abe, C. Bronner, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, M. Nakahata, Y. Nakano, S. Nakayama, Y. Noguchi, K. Okamoto, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, S. Watanabe, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, S. Yoshida, G. D. Megias, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, E. Kearns, J. L. Raaf, L. Wan, T. Wester, B. W. Pointon, J. Bian, N. J. Griskevich, S. Locke, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, M. C. Jang, S. H. Lee, D. H. Moon, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, O. Drapier, A. Giampaolo, Th. A. Mueller, P. Paganini, B. Quilain, R. Rogly, A. D. Santos, T. Nakamura, J. S. Jang, L. N. Machado, J. G. Learned, K. Choi, N. Iovine, S. Cao, L. H. V. Anthony, D. Marin, N. W. Prouse, M. Scott, A. A. Sztuc, Y. Uchida, V. Berardi, N. F. Calabria, M. G. Catanesi, E. Radicioni, A. Langella, G. De Rosa, G. Collazuol, F. Iacob, M. Lamoureux, M. Mattiazzi, L. Ludovici, M. Gonin, L. Perisse, G. Pronost, C. Fujisawa, Y. Maekawa, Y. Nishimura, R. Okazaki, R. Akutsu, M. Friend, T. Hasegawa, T. Ishida, M. Jakkapu, T. Kobayashi, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, N. Bhuiyan, G. T. Burton, J. Gao, A. Goldsack, T. Katori, F. Di. Lodovico, J. Migenda, R. M. Ramsden, Z. Xie, S. Zsoldos, Y. Kotsar, H. Ozaki, A. T. Suzuki, Y. Takagi, Y. Takeuchi, H. Zhong, J. Feng, L. Feng, J. R. Hu, Z. Hu, M. Kawaue, T. Kikawa, M. Mori, T. Nakaya, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, P. Mehta, A. Tarrant, M. J. Wilking, Y. Fukuda, Y. Itow, H. Menjo, K. Ninomiya, Y. Yoshioka, J. Lagoda, M. Mandal, P. Mijakowski, Y. S. Prabhu, J. Zalipska, M. Jia, J. Jiang, C. K. Jung, W. Shi, C. Yanagisawa, M. Harada, Y. Hino, H. Ishino, Y. Koshio, F. Nakanishi, S. Sakai, T. Tano, T. Ishizuka, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. M. Holin, F. Nova, S. Jung, B. S. Yang, J. Y. Yang, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, M. D. Thiesse, L. F. Thompson, S. T. Wilson, H. Okazawa, S. M. Lakshmi, S. B. Kim, E. Kwon, J. W. Seo, I. Yu, A. K. Ichikawa, K. D. Nakamura, S. Tairafune, K. Nishijima, A. Eguchi, K. Nakagiri, Y. Nakajima, S. Shima, N. Taniuchi, E. Watanabe, M. Yokoyama, S. Fujita, C. Jesus-Valls, K. Martens, K. M. Tsui, P. de Perio, M. R. Vagins, J. Xia, S. Izumiyama, M. Kuze, R. Matsumoto, K. Terada, M. Ishitsuka, H. Ito, T. Kinoshita, Y. Ommura, N. Shigeta, M. Shinoki, T. Suganuma, K. Yamauchi, T. Yoshida, J. F. Martin, H. A. Tanaka, T. Towstego, R. Gaur, V. Gousy-Leblanc, M. Hartz, A. Konaka, X. Li, S. Chen, B. D. Xu, B. Zhang, M. Posiadala-Zezula, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, S. Amanai, Ll. Marti, A. Minamino, G. Pintaudi, S. Sano, S. Suzuki, K. Wada

    Physical Review D   110 ( 8 )   2024.10

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    We present the results of the charge ratio (R) and polarization (P0μ) measurements using decay electron events collected between September 2008 and June 2022 with the Super-Kamiokande detector. Because of its underground location and long operation, we are able to perform high-precision measurements by accumulating cosmic-ray muons. We measured the muon charge ratio to be R=1.32±0.02(stat+syst) at EμcosθZenith=0.7−0.2+0.3  TeV, where Eμ is the muon energy and θZenith is the zenith angle of incoming cosmic-ray muons. This result is consistent with the Honda flux model while indicating a tension with the πK model of 1.9σ. We also measured the muon polarization at the production location to be P0μ=0.52±0.02  (stat+syst) at the muon momentum of 0.9−0.1+0.6  TeV/c at the surface of the mountain; this also suggests a tension with the Honda flux model of 1.5σ. This is the most precise measurement ever to experimentally determine the cosmic-ray muon polarization near 1  TeV/c. These measurement results are useful to improve atmospheric neutrino simulations.

    Published by the American Physical Society 2024

    DOI: 10.1103/physrevd.110.082008

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  • Combined Pre-supernova Alert System with KamLAND and Super-Kamiokande

    S. Abe, M. Eizuka, S. Futagi, A. Gando, Y. Gando, S. Goto, T. Hachiya, K. Hata, K. Ichimura, S. Ieki, H. Ikeda, K. Inoue, K. Ishidoshiro, Y. Kamei, N. Kawada, Y. Kishimoto, M. Koga, M. Kurasawa, T. Mitsui, H. Miyake, D. Morita, T. Nakahata, R. Nakajima, K. Nakamura, R. Nakamura, R. Nakamura, J. Nakane, H. Ozaki, K. Saito, T. Sakai, I. Shimizu, J. Shirai, K. Shiraishi, R. Shoji, A. Suzuki, A. Takeuchi, K. Tamae, H. Watanabe, K. Watanabe, S. Yoshida, S. Umehara, K. Fushimi, K. Kotera, Y. Urano, B. E. Berger, B. K. Fujikawa, J. G. Learned, J. Maricic, Z. Fu, J. Smolsky, L. A. Winslow, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, S. Dell’Oro, T. O’Donnell, J. A. Detwiler, S. Enomoto, M. P. Decowski, K. M. Weerman, C. Grant, H. Song, A. Li, S. N. Axani, M. Garcia, K. Abe, S. Abe, C. Bronner, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, M. Nakahata, Y. Nakano, S. Nakayama, Y. Noguchi, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, H. Tanaka, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, S. Yoshida, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, B. W. Pointon, E. Kearns, J. L. Raaf, L. Wan, T. Wester, J. Bian, N. J. Griskevich, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, M. C. Jang, S. H. Lee, D. H. Moon, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, O. Drapier, A. Giampaolo, Th. A. Mueller, A. D. Santos, P. Paganini, B. Quilain, R. Rogly, T. Nakamura, J. S. Jang, L. N. Machado, J. G. Learned, K. Choi, N. Iovine, S. Cao, L. H. V. Anthony, D. Martin, N. W. Prouse, M. Scott, Y. Uchida, V. Berardi, N. F. Calabria, M. G. Catanesi, E. Radicioni, A. Langella, G. De Rosa, G. Collazuol, M. Feltre, F. Iacob, M. Mattiazzi, L. Ludovici, M. Gonin, L. Périssé, G. Pronost, C. Fujisawa, S. Horiuchi, M. Kobayashi, Y. M. Liu, Y. Maekawa, Y. Nishimura, R. Okazaki, R. Akutsu, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, A. Portocarrero Yrey, N. Bhuiyan, G. T. Burton, F. Di Lodovico, J. Gao, A. Goldsack, T. Katori, J. Migenda, R. M. Ramsden, Z. Xie, S. Zsoldos, A. T. Suzuki, Y. Takagi, Y. Takeuchi, H. Zhong, J. Feng, L. Feng, J. R. Hu, Z. Hu, M. Kawaue, T. Kikawa, M. Mori, T. Nakaya, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, P. Mehta, A. Tarrant, M. J. Wilking, Y. Fukuda, Y. Itow, H. Menjo, K. Ninomiya, Y. Yoshioka, J. Lagoda, M. Mandal, P. Mijakowski, Y. S. Prabhu, J. Zalipska, M. Jia, J. Jiang, W. Shi, C. Yanagisawa, M. Harada, Y. Hino, H. Ishino, Y. Koshio, F. Nakanishi, S. Sakai, T. Tada, T. Tano, T. Ishizuka, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, S. Jung, B. S. Yang, J. Y. Yang, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, M. D. Thiesse, L. F. Thompson, S. T. Wilson, H. Okazawa, S. M. Lakshmi, S. B. Kim, E. Kwon, J. W. Seo, I. Yu, A. K. Ichikawa, K. D. Nakamura, S. Tairafune, K. Nishijima, A. Eguchi, K. Nakagiri, Y. Nakajima, S. Shima, N. Taniuchi, E. Watanabe, M. Yokoyama, P. de Perio, S. Fujita, C. Jesús-Valls, K. Martens, K. M. Tsui, M. R. Vagins, J. Xia, S. Izumiyama, M. Kuze, R. Matsumoto, K. Terada, R. Asaka, M. Ishitsuka, H. Ito, Y. Ommura, N. Shigeta, M. Shinoki, K. Yamauchi, T. Yoshida, R. Gaur, V. Gousy-Leblanc, M. Hartz, A. Konaka, X. Li, S. Chen, B. D. Xu, A. Q. Zhang, B. Zhang, M. Posiadala-Zezula, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, S. Amanai, Ll. Marti, A. Minamino, R. Shibayama, S. Suzuki

    The Astrophysical Journal   973 ( 2 )   140 - 140   2024.9

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    Publishing type:Research paper (scientific journal)   Publisher:American Astronomical Society  

    Abstract

    Preceding a core-collapse supernova (CCSN), various processes produce an increasing amount of neutrinos of all flavors characterized by mounting energies from the interior of massive stars. Among them, the electron antineutrinos are potentially detectable by terrestrial neutrino experiments such as KamLAND and Super-Kamiokande (SK) via inverse beta decay interactions. Once these pre-supernova (pre-SN) neutrinos are observed, an early warning of the upcoming CCSN can be provided. In light of this, KamLAND and SK, both located in the Kamioka mine in Japan, have been monitoring pre-SN neutrinos since 2015 and 2021, respectively. Recently, we performed a joint study between KamLAND and SK on pre-SN neutrino detection. A pre-SN alert system combining the KamLAND detector and the SK detector was developed and put into operation, which can provide a supernova alert to the astrophysics community. Fully leveraging the complementary properties of these two detectors, the combined alert is expected to resolve a pre-SN neutrino signal from a 15 M ⊙ star within 510 pc of the Earth at a significance level corresponding to a false alarm rate of no more than 1 per century. For a Betelgeuse-like model with optimistic parameters, it can provide early warnings up to 12 hr in advance.

    DOI: 10.3847/1538-4357/ad5fee

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  • Development of a Data Overflow Protection System for Super-Kamiokande to Maximize Data from Nearby Supernovae

    M Mori, K Abe, Y Hayato, K Hiraide, K Hosokawa, K Ieki, M Ikeda, J Kameda, Y Kanemura, R Kaneshima, Y Kashiwagi, Y Kataoka, S Miki, S Mine, M Miura, S Moriyama, Y Nakano, M Nakahata, S Nakayama, Y Noguchi, K Okamoto, K Sato, H Sekiya, H Shiba, K Shimizu, M Shiozawa, Y Sonoda, Y Suzuki, A Takeda, Y Takemoto, A Takenaka, H Tanaka, S Watanabe, T Yano, S Han, T Kajita, K Okumura, T Tashiro, T Tomiya, X Wang, S Yoshida, G D Megias, P Fernandez, L Labarga, N Ospina, B Zaldivar, B W Pointon, E Kearns, J L Raaf, L Wan, T Wester, J Bian, N J Griskevich, S Locke, M B Smy, H W Sobel, V Takhistov, A Yankelevich, J Hill, M C Jang, S H Lee, D H Moon, R G Park, B Bodur, K Scholberg, C W Walter, A Beauchêne, O Drapier, A Giampaolo, Th A Mueller, A D Santos, P Paganini, B Quilain, R Rogly, T Ishizuka, T Nakamura, J S Jang, J G Learned, K Choi, N Iovine, S Cao, L H V Anthony, D Martin, M Scott, A A Sztuc, Y Uchida, V Berardi, M G Catanesi, E Radicioni, N F Calabria, A Langella, L N Machado, G De Rosa, G Collazuol, F Iacob, M Lamoureux, M Mattiazzi, L Ludovici, M Gonin, L Perisse, G Pronost, C Fujisawa, Y Maekawa, Y Nishimura, R Okazaki, R Akutsu, M Friend, T Hasegawa, T Ishida, T Kobayashi, M Jakkapu, T Matsubara, T Nakadaira, K Nakamura, Y Oyama, K Sakashita, T Sekiguchi, T Tsukamoto, N Bhuiyan, G T Burton, R Edwards, F Di Lodovico, J Gao, A Goldsack, T Katori, J Migenda, R M Ramsden, Z Xie, S Zsoldos, Y Kotsar, H Ozaki, A T Suzuki, Y Takagi, Y Takeuchi, H Zhong, C Bronner, J Feng, J R Hu, Z Hu, M Kawaune, T Kikawa, F LiCheng, T Nakaya, R A Wendell, K Yasutome, S J Jenkins, N McCauley, P Mehta, A Tarant, Y Fukuda, Y Itow, H Menjo, K Ninomiya, Y Yoshioka, J Lagoda, S M Lakshmi, M Mandal, P Mijakowski, Y S Prabhu, J Zalipska, M Jia, J Jiang, C K Jung, W Shi, M J Wilking, C Yanagisawa, M Harada, Y Hino, H Ishino, H Kitagawa, Y Koshio, F Nakanishi, S Sakai, T Tada, T Tano, G Barr, D Barrow, L Cook, S Samani, D Wark, A Holin, F Nova, S Jung, B S Yang, J Y Yang, J Yoo, J E P Fannon, L Kneale, M Malek, J M McElwee, M D Thiesse, L F Thompson, S Wilson, H Okazawa, S B Kim, E Kwon, J W Seo, I Yu, A K Ichikawa, K D Nakamura, S Tairafune, K Nishijima, A Eguchi, K Nakagiri, Y Nakajima, S Shima, N Taniuchi, E Watanabe, M Yokoyama, P de Perio, S Fujita, K Martens, K M Tsui, M R Vagins, C J Valls, J Xia, M Kuze, S Izumiyama, M Ishitsuka, H Ito, T Kinoshita, R Matsumoto, Y Ommura, N Shigeta, M Shinoki, T Suganuma, K Yamauchi, T Yoshida, J F Martin, H A Tanaka, T Towstego, R Gaur, V Gousy-Leblanc, M Hartz, A Konaka, X Li, N W Prouse, S Chen, B D Xu, B Zhang, M Posiadala-Zezula, S B Boyd, D Hadley, M Nicholson, M O’Flaherty, B Richards, A Ali, B Jamieson, S Amanai, Ll Marti, A Minamino, G Pintaudi, S Sano, S Suzuki, K Wada

    Progress of Theoretical and Experimental Physics   2024 ( 10 )   2024.8

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    Publishing type:Research paper (scientific journal)   Publisher:Oxford University Press (OUP)  

    Abstract

    Neutrinos from very nearby supernovae, such as Betelgeuse, are expected to generate more than ten million events over 10 s in Super-Kamokande (SK). At such large event rates, the buffers of the SK analog-to-digital conversion board (QBEE) will overflow, causing random loss of data that are critical for understanding the dynamics of the supernova explosion mechanism. In order to solve this problem, two new data-acquisition (DAQ) modules were developed to aid in the observation of very nearby supernovae. The first of these, the SN module, is designed to save only the number of hit photomultiplier tubes during a supernova burst and the second, the Veto module, prescales the high-rate neutrino events to prevent the QBEE from overflowing based on information from the SN module. In the event of a very nearby supernova, these modules allow SK to reconstruct the time evolution of the neutrino event rate from beginning to end using both QBEE and SN module data. This paper presents the development and testing of these modules together with an analysis of supernova-like data generated with a flashing laser diode. We demonstrate that the Veto module successfully prevents DAQ overflows for Betelgeuse-like supernovae as well as the long-term stability of the new modules. During normal running the Veto module is found to issue DAQ vetos a few times per month resulting in a total dead-time less than 1 ms, and does not influence ordinary operations. Additionally, using simulation data we find that supernovae closer than 800 pc will trigger the Veto module, resulting in a prescaling of the observed neutrino data.

    DOI: 10.1093/ptep/ptae128

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    Other Link: https://academic.oup.com/ptep/article-pdf/2024/10/103H01/60221229/ptae128.pdf

  • New methods and simulations for cosmogenic induced spallation removal in Super-Kamiokande-IV

    S. Locke, A. Coffani, K. Abe, C. Bronner, Y. Hayato, M. Ikeda, S. Imaizumi, H. Ito, J. Kameda, Y. Kataoka, M. Miura, S. Moriyama, Y. Nagao, M. Nakahata, Y. Nakajima, S. Nakayama, T. Okada, K. Okamoto, A. Orii, G. Pronost, H. Sekiya, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, T. Yano, K. Hirade, Y. Kanemura, S. Miki, S. Watabe, S. Han, T. Kajita, K. Okumura, T. Tashiro, J. Xia, X. Wang, G. D. Megias, D. Bravo-Berguño, L. Labarga, Ll. Marti, B. Zaldivar, B. W. Pointon, F. d. M. Blaszczyk, E. Kearns, J. L. Raaf, J. L. Stone, L. Wan, T. Wester, J. Bian, N. J. Griskevich, W. R. Kropp, S. Mine, M. B. Smy, H. W. Sobel, V. Takhistov, P. Weatherly, A. Yankelevich, J. Hill, J. Y. Kim, I. T. Lim, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, L. Bernard, O. Drapier, S. El Hedri, A. Giampaolo, M. Gonin, Th. A. Mueller, P. Paganini, B. Quilain, A. D. Santos, T. Ishizuka, T. Nakamura, J. S. Jang, J. G. Learned, L. H. V. Anthony, A. A. Sztuc, Y. Uchida, D. Martin, M. Scott, V. Berardi, M. G. Catanesi, E. Radicioni, N. F. Calabria, L. N. Machado, G. De Rosa, G. Collazuol, F. Iacob, M. Lamoureux, N. Ospina, M. Mattiazzi, L. Ludovici, Y. Nishimura, Y. Maewaka, S. Cao, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, Y. Nakano, T. Shiozawa, A. T. Suzuki, Y. Takeuchi, S. Yamamoto, Y. Kotsar, H. Ozaki, A. Ali, Y. Ashida, J. Feng, S. Hirota, A. K. Ichikawa, T. Kikawa, M. Mori, T. Nakaya, R. A. Wendell, K. Yasutome, P. Fernandez, N. McCauley, P. Mehta, K. M. Tsui, Y. Fukuda, Y. Itow, H. Menjo, T. Niwa, K. Sato, M. Tsukada, P. Mijakowski, J. Lagoda, S. M. Lakshmi, J. Zalipska, C. K. Jung, C. Vilela, M. J. Wilking, C. Yanagisawa, J. Jiang, K. Hagiwara, M. Harada, T. Horai, H. Ishino, S. Ito, Y. Koshio, W. Ma, N. Piplani, S. Sakai, H. Kitagawa, G. Barr, D. Barrow, L. Cook, A. Goldsack, S. Samani, D. Wark, F. Nova, T. Boschi, F. Di Lodovico, M. Taani, S. Zsoldos, J. Gao, J. Migenda, J. Y. Yang, S. J. Jenkins, M. Malek, J. M. McElwee, O. Stone, M. D. Thiesse, L. F. Thompson, H. Okazawa, K. Nakamura, S. B. Kim, I. Yu, J. W. Seo, K. Nishijima, M. Koshiba, K. Iwamoto, N. Ogawa, M. Yokoyama, K. Martens, M. R. Vagins, K. Nakagiri, M. Kuze, S. Izumiyama, T. Yoshida, M. Inomoto, M. Ishitsuka, R. Matsumoto, K. Ohta, M. Shinoki, T. Suganuma, T. Kinoshita, J. F. Martin, H. A. Tanaka, T. Towstego, R. Akutsu, M. Hartz, A. Konaka, P. de Perio, N. W. Prouse, S. Chen, B. D. Xu, Y. Zhang, M. Posiadala-Zezula, B. Richards, B. Jamieson, J. Walker, A. Minamino, K. Okamoto, G. Pintaudi, R. Sasaki

    Physical Review D   110 ( 3 )   2024.8

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    Radioactivity induced by cosmic muon spallation is a dominant source of backgrounds for O ( 10     MeV ) neutrino interactions in water Cherenkov detectors. In particular, it is crucial to reduce backgrounds to measure the solar neutrino spectrum and find neutrino interactions from distant supernovae. In this paper we introduce new techniques to locate muon-induced hadronic showers and efficiently reject spallation backgrounds. Applying these techniques to the solar neutrino analysis with an exposure of 2790 × 22.5     kton · day increases the signal efficiency by 12.6%, approximately corresponding to an additional year of detector running. Furthermore, we present the first spallation simulation at Super-Kamiokande, where we model hadronic interactions using . The agreement between the isotope yields and shower pattern in this simulation and in the data gives confidence in the accuracy of this simulation, and thus opens the door to use it to optimize muon spallation removal in new data with gadolinium-enhanced neutron capture detection.

    Published by the American Physical Society 2024

    DOI: 10.1103/physrevd.110.032003

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  • Second gadolinium loading to Super-Kamiokande

    K. Abe, C. Bronner, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, Y. Nakano, M. Nakahata, S. Nakayama, Y. Noguchi, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, H. Tanaka, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, S. Yoshida, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, B.W. Pointon, E. Kearns, J.L. Raaf, L. Wan, T. Wester, J. Bian, N.J. Griskevich, M.B. Smy, H.W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, M.C. Jang, S.H. Lee, D.H. Moon, R.G. Park, B. Bodur, K. Scholberg, C.W. Walter, A. Beauchêne, O. Drapier, A. Giampaolo, Th.A. Mueller, A.D. Santos, P. Paganini, B. Quilain, R. Rogly, T. Nakamura, J.S. Jang, L.N. Machado, J.G. Learned, K. Choi, N. Iovine, S. Cao, L.H.V. Anthony, D. Martin, N.W. Prouse, M. Scott, Y. Uchida, V. Berardi, N.F. Calabria, M.G. Catanesi, E. Radicioni, A. Langella, G. De Rosa, G. Collazuol, F. Iacob, M. Mattiazzi, L. Ludovici, M. Gonin, L. Périssé, G. Pronost, C. Fujisawa, Y. Maekawa, Y. Nishimura, R. Okazaki, R. Akutsu, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, N. Bhuiyan, G.T. Burton, F. Di Lodovico, J. Gao, A. Goldsack, T. Katori, J. Migenda, R.M. Ramsden, Z. Xie, S. Zsoldos, A.T. Suzuki, Y. Takagi, Y. Takeuchi, H. Zhong, J. Feng, L. Feng, J.R. Hu, Z. Hu, M. Kawaue, T. Kikawa, M. Mori, T. Nakaya, R.A. Wendell, K. Yasutome, S.J. Jenkins, N. McCauley, P. Mehta, A. Tarant, M.J. Wilking, Y. Fukuda, Y. Itow, H. Menjo, K. Ninomiya, Y. Yoshioka, J. Lagoda, M. Mandal, P. Mijakowski, Y.S. Prabhu, J. Zalipska, M. Jia, J. Jiang, W. Shi, C. Yanagisawa, M. Harada, Y. Hino, H. Ishino, Y. Koshio, F. Nakanishi, S. Sakai, T. Tada, T. Tano, T. Ishizuka, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, S. Jung, B.S. Yang, J.Y. Yang, J. Yoo, J.E.P. Fannon, L. Kneale, M. Malek, J.M. McElwee, M.D. Thiesse, L.F. Thompson, S.T. Wilson, H. Okazawa, S.M. Lakshmi, S.B. Kim, E. Kwon, J.W. Seo, I. Yu, A.K. Ichikawa, K. Nakamura, S. Tairafune, K. Nishijima, A. Eguchi, K. Nakagiri, Y. Nakajima, S. Shima, N. Taniuchi, E. Watanabe, M. Yokoyama, P. de Perio, S. Fujita, C. Jesús-Valls, K. Martens, K.M. Tsui, M.R. Vagins, J. Xia, S. Izumiyama, M. Kuze, R. Matsumoto, K. Terada, M. Ishitsuka, H. Ito, Y. Ommura, N. Shigeta, M. Shinoki, K. Yamauchi, T. Yoshida, R. Gaur, V. Gousy-Leblanc, M. Hartz, A. Konaka, X. Li, S. Chen, B.D. Xu, B. Zhang, M. Posiadala-Zezula, S.B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, S. Amanai, Ll. Marti, A. Minamino, S. Suzuki, P.R. Scovell, E. Meehan, I. Bandac, C. Peña-Garay, J. Pérez, O. Gileva, E.K. Lee, D.S. Leonard, Y. Sakakieda, A. Sakaguchi, K. Sueki, Y. Takaku, S. Yamasaki

    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   1065   169480 - 169480   2024.8

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.nima.2024.169480

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  • Performance of SK-Gd’s Upgraded Real-time Supernova Monitoring System

    Y. Kashiwagi, K. Abe, C. Bronner, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, Y. Nakano, M. Nakahata, S. Nakayama, Y. Noguchi, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, H. Tanaka, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, S. Yoshida, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, B. W. Pointon, E. Kearns, J. L. Raaf, L. Wan, T. Wester, J. Bian, N. J. Griskevich, S. Locke, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, M. C. Jang, S. H. Lee, D. H. Moon, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, O. Drapier, A. Giampaolo, Th. A. Mueller, A. D. Santos, P. Paganini, B. Quilain, R. Rogly, T. Nakamura, J. S. Jang, L. N. Machado, J. G. Learned, K. Choi, N. Iovine, S. Cao, L. H. V. Anthony, D. Martin, N. W. Prouse, M. Scott, A. A. Sztuc, Y. Uchida, V. Berardi, M. G. Catanesi, E. Radicioni, N. F. Calabria, A. Langella, G. De Rosa, G. Collazuol, F. Iacob, M. Mattiazzi, L. Ludovici, M. Gonin, L. Périssé, G. Pronost, C. Fujisawa, Y. Maekawa, Y. Nishimura, R. Okazaki, R. Akutsu, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, N. Bhuiyan, G. T. Burton, F. Di Lodovico, J. Gao, A. Goldsack, T. Katori, J. Migenda, R. M. Ramsden, Z. Xie, S. Zsoldos, A. T. Suzuki, Y. Takagi, Y. Takeuchi, H. Zhong, J. Feng, L. Feng, J. R. Hu, Z. Hu, M. Kawaue, T. Kikawa, M. Mori, T. Nakaya, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, P. Mehta, A. Tarrant, Y. Fukuda, Y. Itow, H. Menjo, K. Ninomiya, Y. Yoshioka, J. Lagoda, S. M. Lakshmi, M. Mandal, P. Mijakowski, Y. S. Prabhu, J. Zalipska, M. Jia, J. Jiang, C. K. Jung, W. Shi, M. J. Wilking, C. Yanagisawa, M. Harada, Y. Hino, H. Ishino, Y. Koshio, F. Nakanishi, S. Sakai, T. Tada, T. Tano, T. Ishizuka, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, S. Jung, B. S. Yang, J. Y. Yang, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, M. D. Thiesse, L. F. Thompson, S. T. Wilson, H. Okazawa, S. B. Kim, E. Kwon, J. W. Seo, I. Yu, A. K. Ichikawa, K. D. Nakamura, S. Tairafune, K. Nishijima, A. Eguchi, K. Nakagiri, Y. Nakajima, S. Shima, N. Taniuchi, E. Watanabe, M. Yokoyama, P. de Perio, S. Fujita, C. Jesús-Valls, K. Martens, K. M. Tsui, M. R. Vagins, J. Xia, M. Kuze, S. Izumiyama, R. Matsumoto, M. Ishitsuka, H. Ito, Y. Ommura, N. Shigeta, M. Shinoki, K. Yamauchi, T. Yoshida, R. Gaur, V. Gousy-Leblanc, M. Hartz, A. Konaka, X. Li, S. Chen, B. D. Xu, B. Zhang, M. Posiadala-Zezula, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, S. Amanai, Ll. Marti, A. Minamino, S. Suzuki

    The Astrophysical Journal   970 ( 1 )   93 - 93   2024.7

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    Publishing type:Research paper (scientific journal)   Publisher:American Astronomical Society  

    Abstract

    Among multimessenger observations of the next Galactic core-collapse supernova, Super-Kamiokande (SK) plays a critical role in detecting the emitted supernova neutrinos, determining the direction to the supernova (SN), and notifying the astronomical community of these observations in advance of the optical signal. In 2022, SK has increased the gadolinium dissolved in its water target (SK-Gd) and has achieved a Gd concentration of 0.033%, resulting in enhanced neutron detection capability, which in turn enables more accurate determination of the supernova direction. Accordingly, SK-Gd’s real-time supernova monitoring system has been upgraded. SK_SN Notice, a warning system that works together with this monitoring system, was released on 2021 December 13, and is available through GCN Notices. When the monitoring system detects an SN-like burst of events, SK_SN Notice will automatically distribute an alarm with the reconstructed direction to the supernova candidate within a few minutes. In this paper, we present a systematic study of SK-Gd’s response to a simulated Galactic SN. Assuming a supernova situated at 10 kpc, neutrino fluxes from six supernova models are used to characterize SK-Gd’s pointing accuracy using the same tools as the online monitoring system. The pointing accuracy is found to vary from 3° to 7° depending on the models. However, if the supernova is closer than 10 kpc, SK_SN Notice can issue an alarm with three-degree accuracy, which will benefit follow-up observations by optical telescopes with large fields of view.

    DOI: 10.3847/1538-4357/ad4d8e

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    Other Link: https://iopscience.iop.org/article/10.3847/1538-4357/ad4d8e/pdf

  • Search for Periodic Time Variations of the Solar 8B Neutrino Flux between 1996 and 2018 in Super-Kamiokande

    K. Abe, C. Bronner, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, Y. Nakano, M. Nakahata, S. Nakayama, Y. Noguchi, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, H. Tanaka, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, S. Yoshida, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, B. W. Pointon, E. Kearns, J. L. Raaf, L. Wan, T. Wester, J. Bian, N. J. Griskevich, S. Locke, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, S. H. Lee, D. H. Moon, R. G. Park, M. C. Jang, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, O. Drapier, A. Giampaolo, Th. A. Mueller, A. D. Santos, P. Paganini, B. Quilain, T. Nakamura, J. S. Jang, L. N. Machado, J. G. Learned, K. Choi, N. Iovine, S. Cao, L. H. V. Anthony, D. Martin, N. W. Prouse, M. Scott, A. A. Sztuc, Y. Uchida, V. Berardi, M. G. Catanesi, E. Radicioni, N. F. Calabria, A. Langella, G. De Rosa, G. Collazuol, F. Iacob, M. Mattiazzi, L. Ludovici, M. Gonin, G. Pronost, C. Fujisawa, Y. Maekawa, Y. Nishimura, R. Okazaki, R. Akutsu, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, N. Bhuiyan, G. T. Burton, F. Di Lodovico, J. Gao, A. Goldsack, T. Katori, J. Migenda, Z. Xie, R. M. Ramsden, S. Zsoldos, A. T. Suzuki, Y. Takagi, H. Zhong, Y. Takeuchi, J. Feng, L. Feng, J. R. Hu, Z. Hu, T. Kikawa, M. Mori, M. Kawaue, T. Nakaya, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, P. Mehta, A. Tarant, Y. Fukuda, Y. Itow, H. Menjo, K. Ninomiya, Y. Yoshioka, J. Lagoda, S. M. Lakshmi, M. Mandal, P. Mijakowski, Y. S. Prabhu, J. Zalipska, M. Jia, J. Jiang, C. K. Jung, M. J. Wilking, C. Yanagisawa, W. Shi, M. Harada, Y. Hino, H. Ishino, Y. Koshio, F. Nakanishi, S. Sakai, T. Tada, T. Tano, T. Ishizuka, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, B. S. Yang, J. Y. Yang, J. Yoo, S. Jung, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, M. D. Thiesse, L. F. Thompson, S. T. Wilson, H. Okazawa, S. B. Kim, E. Kwon, J. W. Seo, I. Yu, A. K. Ichikawa, K. D. Nakamura, S. Tairafune, K. Nishijima, A. Eguchi, K. Nakagiri, Y. Nakajima, S. Shima, N. Taniuchi, E. Watanabe, M. Yokoyama, P. de Perio, S. Fujita, K. Martens, K. M. Tsui, M. R. Vagins, J. Xia, S. Izumiyama, M. Kuze, R. Matsumoto, M. Ishitsuka, H. Ito, Y. Ommura, N. Shigeta, M. Shinoki, K. Yamauchi, T. Yoshida, R. Gaur, V. Gousy-Leblanc, M. Hartz, A. Konaka, X. Li, S. Chen, B. D. Xu, B. Zhang, M. Posiadala-Zezula, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, S. Amanai, Ll. Marti, A. Minamino, S. Suzuki

    Physical Review Letters   132 ( 24 )   2024.6

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    We report a search for time variations of the solar B8 neutrino flux using 5804 live days of Super-Kamiokande data collected between May 31, 1996, and May 30, 2018. Super-Kamiokande measured the precise time of each solar neutrino interaction over 22 calendar years to search for solar neutrino flux modulations with unprecedented precision. Periodic modulations are searched for in a dataset comprising five-day interval solar neutrino flux measurements with a maximum likelihood method. We also applied the Lomb-Scargle method to this dataset to compare it with previous reports. The only significant modulation found is due to the elliptic orbit of the Earth around the Sun. The observed modulation is consistent with astronomical data: we measured an eccentricity of (1.53±0.35)%, and a perihelion shift of (−1.5±13.5) days.

    Published by the American Physical Society 2024

    DOI: 10.1103/physrevlett.132.241803

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevLett.132.241803/fulltext

  • Solar neutrino measurements using the full data period of Super-Kamiokande-IV

    K. Abe, C. Bronner, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, S. Imaizumi, K. Iyogi, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, Y. Kato, Y. Kishimoto, S. Miki, S. Mine, M. Miura, T. Mochizuki, S. Moriyama, Y. Nagao, M. Nakahata, Y. Nakano, S. Nakayama, Y. Noguchi, T. Okada, K. Okamoto, A. Orii, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, S. Watanabe, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, T. Tomiya, R. Wang, X. Wang, S. Yoshida, D. Bravo-Berguño, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, B. W. Pointon, F. d. M. Blaszczyk, C. Kachulis, E. Kearns, J. L. Raaf, J. L. Stone, L. Wan, T. Wester, J. Bian, N. J. Griskevich, W. R. Kropp, S. Locke, M. B. Smy, H. W. Sobel, V. Takhistov, P. Weatherly, A. Yankelevich, K. S. Ganezer, J. Hill, M. C. Jang, J. Y. Kim, S. Lee, I. T. Lim, D. H. Moon, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, L. Bernard, A. Coffani, O. Drapier, S. El Hedri, A. Giampaolo, J. Imber, Th. A. Mueller, P. Paganini, R. Rogly, B. Quilain, A. Santos, T. Nakamura, J. S. Jang, L. N. Machado, J. G. Learned, S. Matsuno, N. Iovine, K. Choi, S. Cao, L. H. V. Anthony, R. P. Litchfield, N. Prouse, D. Marin, M. Scott, A. A. Sztuc, Y. Uchida, V. Berardi, M. G. Catanesi, R. A. Intonti, E. Radicioni, N. F. Calabria, G. De Rosa, A. Langella, G. Collazuol, F. Iacob, M. Lamoureux, M. Mattiazzi, L. Ludovici, M. Gonin, L. Périssé, G. Pronost, C. Fujisawa, Y. Maekawa, Y. Nishimura, R. Okazaki, M. Friend, T. Hasegawa, T. Ishida, M. Jakkapu, T. Kobayashi, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, T. Boschi, N. Bhuiyan, G. T. Burton, J. Gao, A. Goldsack, T. Katori, F. Di Lodovico, J. Migenda, S. Molina Sedgwick, R. M. Ramsden, M. Taani, Z. Xie, S. Zsoldos, KE. Abe, M. Hasegawa, Y. Isobe, Y. Kotsar, H. Miyabe, H. Ozaki, T. Shiozawa, T. Sugimoto, A. T. Suzuki, Y. Takagi, Y. Takeuchi, S. Yamamoto, H. Zhong, Y. Ashida, J. Feng, L. Feng, T. Hayashino, S. Hirota, J. R. Hu, Z. Hu, M. Jiang, M. Kawaue, T. Kikawa, M. Mori, KE. Nakamura, T. Nakaya, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, P. Mehta, A. Pritchard, A. Tarrant, M. J. Wilking, Y. Fukuda, Y. Itow, H. Menjo, M. Murase, K. Ninomiya, T. Niwa, M. Tsukada, Y. Yoshioka, K. Frankiewicz, J. Lagoda, M. Mandal, P. Mijakowski, Y. S. Prabhu, J. Zalipska, J. Jiang, M. Jia, C. K. Jung, J. L. Palomino, G. Santucci, W. Shi, C. Vilela, C. Yanagisawa, D. Fukuda, K. Hagiwara, M. Harada, Y. Hino, T. Horai, H. Ishino, S. Ito, H. Kitagawa, Y. Koshio, W. Ma, F. Nakanishi, N. Piplani, S. Sakai, M. Sakuda, T. Tada, T. Tano, C. Xu, R. Yamaguchi, T. Ishizuka, Y. Kuno, G. Barr, D. Barrow, L. Cook, S. Samani, C. Simpson, D. Wark, A. M. Holin, F. Nova, S. Jung, B. Yang, J. Y. Yang, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, O. Stone, M. D. Thiesse, L. F. Thompson, S. T. Wilson, H. Okazawa, S. M. Lakshmi, Y. Choi, S. B. Kim, E. Kwon, J. W. Seo, I. Yu, A. K. Ichikawa, K. Nakamura, S. Tairafune, K. Nishijima, A. Eguchi, K. Iwamoto, K. Nakagiri, Y. Nakajima, N. Ogawa, S. Shima, E. Watanabe, M. Yokoyama, R. G. Calland, S. Fujita, C. Jesús-Valls, J. Xia, T. K. Ming, P. de Perio, K. Martens, M. Murdoch, M. R. Vagins, S. Izumiyama, M. Kuze, R. Matsumoto, Y. Okajima, M. Tanaka, T. Yoshida, M. Inomoto, M. Ishitsuka, H. Ito, T. Kinoshita, R. Matsumoto, K. Ohta, Y. Ommura, M. Shinoki, N. Shigeta, T. Suganuma, K. Yamauchi, T. Yoshida, J. F. Martin, C. M. Nantais, H. A. Tanaka, T. Towstego, R. Gaur, V. Gousy-Leblanc, M. Hartz, A. Konaka, X. Li, S. Chen, B. D. Xu, B. Zhang, S. Berkman, M. Posiadala-Zezula, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, J. Walker, S. Amanai, Ll. Marti, A. Minamino, K. Okamoto, G. Pintaudi, S. Sano, R. Sasaki, S. Suzuki, K. Wada

    Physical Review D   109 ( 9 )   2024.5

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    An analysis of solar neutrino data from the fourth phase of Super-Kamiokande (SK-IV) from October 2008 to May 2018 is performed and the results are presented. The observation time of the dataset of SK-IV corresponds to 2970 days and the total live time for all four phases is 5805 days. For more precise solar neutrino measurements, several improvements are applied in this analysis: lowering the data acquisition threshold in May 2015, further reduction of the spallation background using neutron clustering events, precise energy reconstruction considering the time variation of the PMT gain. The observed number of solar neutrino events in 3.49–19.49 MeV electron kinetic energy region during SK-IV is 65,443 − 388 + 390 ( stat . ) ± 925 ( syst . ) events. Corresponding B 8 solar neutrino flux is ( 2.314 ± 0.014 ( stat . ) ± 0.040 ( syst . ) ) × 10 6     cm − 2   s − 1 , assuming a pure electron-neutrino flavor component without neutrino oscillations. The flux combined with all SK phases up to SK-IV is ( 2.336 ± 0.011 ( stat . ) ± 0.043 ( syst . ) ) × 10 6     cm − 2   s − 1 . Based on the neutrino oscillation analysis from all solar experiments, including the SK 5805 days dataset, the best-fit neutrino oscillation parameters are sin 2 θ 12 , solar = 0.306 ± 0.013 and Δ m 21 , solar 2 = ( 6.1 0 − 0.81 + 0.95 ) × 10 − 5     eV 2 , with a deviation of about 1.5 σ from the Δ m 21 2 parameter obtained by KamLAND. The best-fit neutrino oscillation parameters obtained from all solar experiments and KamLAND are sin 2 θ 12 , global = 0.307 ± 0.012 and Δ m 21 , global 2 = ( 7.5 0 − 0.18 + 0.19 ) × 10 − 5     eV 2 .

    Published by the American Physical Society 2024

    DOI: 10.1103/physrevd.109.092001

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  • Atmospheric neutrino oscillation analysis with neutron tagging and an expanded fiducial volume in Super-Kamiokande I–V

    T. Wester, K. Abe, C. Bronner, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, Y. Nakano, M. Nakahata, S. Nakayama, Y. Noguchi, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, H. Tanaka, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, S. Yoshida, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, B. W. Pointon, E. Kearns, J. L. Raaf, L. Wan, J. Bian, N. J. Griskevich, S. Locke, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, S. H. Lee, D. H. Moon, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, O. Drapier, A. Giampaolo, Th. A. Mueller, A. D. Santos, P. Paganini, B. Quilain, T. Nakamura, J. S. Jang, L. N. Machado, J. G. Learned, K. Choi, N. Iovine, S. Cao, L. H. V. Anthony, D. Martin, N. W. Prouse, M. Scott, A. A. Sztuc, Y. Uchida, V. Berardi, M. G. Catanesi, E. Radicioni, N. F. Calabria, A. Langella, G. De Rosa, G. Collazuol, F. Iacob, M. Mattiazzi, L. Ludovici, M. Gonin, G. Pronost, C. Fujisawa, Y. Maekawa, Y. Nishimura, R. Okazaki, R. Akutsu, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, N. Bhuiyan, G. T. Burton, F. Di Lodovico, J. Gao, A. Goldsack, T. Katori, J. Migenda, R. Ramsden, Z. Xie, S. Zsoldos, A. T. Suzuki, Y. Takagi, Y. Takeuchi, H. Zhong, J. Feng, L. Feng, J. R. Hu, Z. Hu, M. Kawaue, T. Kikawa, M. Mori, T. Nakaya, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, P. Mehta, A. Tarrant, Y. Fukuda, Y. Itow, H. Menjo, K. Ninomiya, J. Lagoda, S. M. Lakshmi, M. Mandal, P. Mijakowski, Y. S. Prabhu, J. Zalipska, M. Jia, J. Jiang, C. K. Jung, W. Shi, M. J. Wilking, C. Yanagisawa, M. Harada, Y. Hino, H. Ishino, Y. Koshio, F. Nakanishi, S. Sakai, T. Tada, T. Tano, T. Ishizuka, G. Barr, D. Barrow, L. Cook, A. Holin, F. Nova, S. Samani, D. Wark, S. Jung, B. S. Yang, J. Y. Yang, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, M. D. Thiesse, L. F. Thompson, S. T. Wilson, H. Okazawa, S. B. Kim, E. Kwon, J. W. Seo, I. Yu, A. K. Ichikawa, K. D. Nakamura, S. Tairafune, K. Nishijima, A. Eguchi, K. Nakagiri, Y. Nakajima, S. Shima, N. Taniuchi, E. Watanabe, M. Yokoyama, P. de Perio, S. Fujita, K. Martens, K. M. Tsui, M. R. Vagins, J. Xia, S. Izumiyama, M. Kuze, R. Matsumoto, M. Ishitsuka, H. Ito, Y. Ommura, N. Shigeta, M. Shinoki, K. Yamauchi, T. Yoshida, R. Gaur, V. Gousy-Leblanc, M. Hartz, A. Konaka, X. Li, S. Chen, B. D. Xu, B. Zhang, M. Posiadala-Zezula, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, S. Amanai, Ll. Marti, A. Minamino, S. Suzuki

    Physical Review D   109 ( 7 )   2024.4

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    We present a measurement of neutrino oscillation parameters with the Super-Kamiokande detector using atmospheric neutrinos from the complete pure-water SK I–V (April 1996–July 2020) dataset, including events from an expanded fiducial volume. The dataset corresponds to 6511.3 live days and an exposure of 484.2 kiloton-years. Measurements of the neutrino oscillation parameters Δ m 3 2 2 , sin 2 θ 2 3 , sin 2 θ 1 3 , δ CP , and the preference for the neutrino mass ordering are presented with atmospheric neutrino data alone, and with constraints on sin 2 θ 1 3 from reactor neutrino experiments. Our analysis including constraints on sin 2 θ 1 3 favors the normal mass ordering at the 92.3% level.

    Published by the American Physical Society 2024

    DOI: 10.1103/physrevd.109.072014

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  • Measurement of the neutrino-oxygen neutral-current quasielastic cross section using atmospheric neutrinos in the SK-Gd experiment

    S. Sakai, K. Abe, C. Bronner, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, Y. Nakano, M. Nakahata, S. Nakayama, Y. Noguchi, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, H. Tanaka, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, S. Yoshida, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, B. W. Pointon, E. Kearns, J. L. Raaf, L. Wan, T. Wester, J. Bian, N. J. Griskevich, S. Locke, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, M. C. Jang, S. H. Lee, D. H. Moon, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, O. Drapier, A. Giampaolo, Th. A. Mueller, A. D. Santos, P. Paganini, B. Quilain, T. Nakamura, J. S. Jang, L. N. Machado, J. G. Learned, K. Choi, N. Iovine, S. Cao, L. H. V. Anthony, D. Martin, N. W. Prouse, M. Scott, A. A. Sztuc, Y. Uchida, V. Berardi, N. F. Calabria, M. G. Catanesi, E. Radicioni, A. Langella, G. De Rosa, G. Collazuol, F. Iacob, M. Mattiazzi, L. Ludovici, M. Gonin, G. Pronost, C. Fujisawa, Y. Maekawa, Y. Nishimura, R. Okazaki, R. Akutsu, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, N. Bhuiyan, G. T. Burton, F. Di Lodovico, J. Gao, A. Goldsack, T. Katori, J. Migenda, R. M. Ramsden, Z. Xie, S. Zsoldos, A. T. Suzuki, Y. Takagi, H. Zhong, Y. Takeuchi, J. Feng, L. Feng, J. R. Hu, Z. Hu, M. Kawaue, T. Kikawa, M. Mori, T. Nakaya, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, P. Mehta, A. Tarant, Y. Fukuda, Y. Itow, H. Menjo, K. Ninomiya, Y. Yoshioka, J. Lagoda, S. M. Lakshmi, M. Mandal, P. Mijakowski, Y. S. Prabhu, J. Zalipska, M. Jia, J. Jiang, C. K. Jung, W. Shi, M. J. Wilking, C. Yanagisawa, M. Harada, Y. Hino, H. Ishino, Y. Koshio, F. Nakanishi, T. Tada, T. Tano, T. Ishizuka, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, S. Jung, B. S. Yang, J. Y. Yang, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, M. D. Thiesse, L. F. Thompson, S. T. Wilson, H. Okazawa, S. B. Kim, E. Kwon, J. W. Seo, I. Yu, A. K. Ichikawa, K. D. Nakamura, S. Tairafune, K. Nishijima, A. Eguchi, K. Nakagiri, Y. Nakajima, S. Shima, N. Taniuchi, E. Watanabe, M. Yokoyama, P. de Perio, S. Fujita, K. Martens, K. M. Tsui, M. R. Vagins, J. Xia, S. Izumiyama, M. Kuze, R. Matsumoto, M. Ishitsuka, H. Ito, Y. Ommura, N. Shigeta, M. Shinoki, K. Yamauchi, T. Yoshida, R. Gaur, V. Gousy-Leblanc, M. Hartz, A. Konaka, X. Li, S. Chen, B. D. Xu, B. Zhang, M. Posiadala-Zezula, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, S. Amanai, Ll. Marti, A. Minamino, S. Suzuki

    Physical Review D   109 ( 1 )   2024.1

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    We report the first measurement of the atmospheric neutrino-oxygen neutral-current quasielastic (NCQE) cross section in the gadolinium-loaded Super-Kamiokande (SK) water Cherenkov detector. In June 2020, SK began a new experimental phase, named SK-Gd, by loading 0.011% by mass of gadolinium into the ultrapure water of the SK detector. The introduction of gadolinium to ultrapure water has the effect of improving the neutron-tagging efficiency. Using a 552.2 day dataset from August 2020 to June 2022, we measure the NCQE cross section to be 0.74±0.22(stat)−0.15+0.85(syst)×10−38  cm2/oxygen  in the energy range from 160 MeV to 10 GeV, which is consistent with the atmospheric neutrino-flux-averaged theoretical NCQE cross section and the measurement in the SK pure-water phase within the uncertainties. Furthermore, we compare the models of the nucleon-nucleus interactions in water and find that the binary cascade model and the Liège intranuclear cascade model provide a somewhat better fit to the observed data than the Bertini cascade model. Since the atmospheric neutrino-oxygen NCQE reactions are one of the main backgrounds in the search for diffuse supernova neutrino background (DSNB), these new results will contribute to future studies—and the potential discovery—of the DSNB in SK.

    Published by the American Physical Society 2024

    DOI: 10.1103/physrevd.109.l011101

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  • Search for Astrophysical Electron Antineutrinos in Super-Kamiokande with 0.01% Gadolinium-loaded Water

    M. Harada, K. Abe, C. Bronner, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, Y. Nakano, M. Nakahata, S. Nakayama, Y. Noguchi, K. Okamoto, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, S. Watanabe, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, S. Yoshida, G. D. Megias, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, B. W. Pointon, E. Kearns, J. L. Raaf, L. Wan, T. Wester, J. Bian, N. J. Griskevich, S. Locke, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, S. H. Lee, D. H. Moon, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, O. Drapier, A. Giampaolo, Th. A. Mueller, A. D. Santos, P. Paganini, B. Quilain, T. Ishizuka, T. Nakamura, J. S. Jang, J. G. Learned, K. Choi, N. Iovine, S. Cao, L. H. V. Anthony, D. Martin, M. Scott, A. A. Sztuc, Y. Uchida, V. Berardi, M. G. Catanesi, E. Radicioni, N. F. Calabria, A. Langella, L. N. Machado, G. De Rosa, G. Collazuol, F. Iacob, M. Lamoureux, M. Mattiazzi, L. Ludovici, M. Gonin, G. Pronost, C. Fujisawa, Y. Maekawa, Y. Nishimura, R. Okazaki, R. Akutsu, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, N. Bhuiyan, G. T. Burton, F. Di Lodovico, J. Gao, A. Goldsack, T. Katori, J. Migenda, Z. Xie, S. Zsoldos, Y. Kotsar, H. Ozaki, A. T. Suzuki, Y. Takagi, Y. Takeuchi, J. Feng, L. Feng, J. R. Hu, Z. Hu, T. Kikawa, M. Mori, T. Nakaya, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, P. Mehta, A. Tarrant, Y. Fukuda, Y. Itow, H. Menjo, K. Ninomiya, J. Lagoda, S. M. Lakshmi, M. Mandal, P. Mijakowski, Y. S. Prabhu, J. Zalipska, M. Jia, J. Jiang, C. K. Jung, M. J. Wilking, C. Yanagisawa, Y. Hino, H. Ishino, H. Kitagawa, Y. Koshio, F. Nakanishi, S. Sakai, T. Tada, T. Tano, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, B. S. Yang, J. Y. Yang, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, M. D. Thiesse, L. F. Thompson, S. T. Wilson, H. Okazawa, S. B. Kim, E. Kwon, J. W. Seo, I. Yu, A. K. Ichikawa, K. D. Nakamura, S. Tairafune, K. Nishijima, K. Nakagiri, Y. Nakajima, S. Shima, N. Taniuchi, E. Watanabe, M. Yokoyama, P. de Perio, K. Martens, K. M. Tsui, M. R. Vagins, J. Xia, M. Kuze, S. Izumiyama, R. Matsumoto, M. Ishitsuka, H. Ito, T. Kinoshita, R. Matsumoto, Y. Ommura, N. Shigeta, M. Shinoki, T. Suganuma, K. Yamauchi, J. F. Martin, H. A. Tanaka, T. Towstego, R. Gaur, V. Gousy-Leblanc, M. Hartz, A. Konaka, X. Li, N. W. Prouse, S. Chen, B. D. Xu, B. Zhang, M. Posiadala-Zezula, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, Ll. Marti, A. Minamino, G. Pintaudi, S. Sano, S. Suzuki, K. Wada

    The Astrophysical Journal Letters   951 ( 2 )   L27 - L27   2023.7

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    Publishing type:Research paper (scientific journal)   Publisher:American Astronomical Society  

    Abstract

    We report the first search result for the flux of astrophysical electron antineutrinos for energies in the gadolinium-loaded Super-Kamiokande (SK) detector. In 2020 June, gadolinium was introduced to the ultrapure water of the SK detector in order to detect neutrons more efficiently. In this new experimental phase, SK-Gd, we can search for electron antineutrinos via inverse beta decay with efficient background rejection thanks to the high efficiency of the neutron tagging technique. In this paper, we report the result for the initial stage of SK-Gd, during 2020 August 26, and 2022 June 1 with a 22.5 × 552 kton · day exposure at 0.01% Gd mass concentration. No significant excess over the expected background in the observed events is found for the neutrino energies below 31.3 MeV. Thus, the flux upper limits are placed at the 90% confidence level. The limits and sensitivities are already comparable with the previous SK result with pure water (22.5 × 2970 kton · day) owing to the enhanced neutron tagging. Operation with Gd increased to 0.03% started in 2022 June.

    DOI: 10.3847/2041-8213/acdc9e

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  • Measurement of the cosmogenic neutron yield in Super-Kamiokande with gadolinium loaded water

    M. Shinoki, K. Abe, Y. Hayato, K. Hiraide, K. Hosokawa, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, Y. Nakano, M. Nakahata, S. Nakayama, Y. Noguchi, K. Okamoto, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, S. Watanabe, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, S. Yoshida, G. D. Megias, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, B. W. Pointon, E. Kearns, J. L. Raaf, L. Wan, T. Wester, J. Bian, N. J. Griskevich, W. R. Kropp, S. Locke, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, S. H. Lee, D. H. Moon, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, A. Beauchêne, L. Bernard, A. Coffani, O. Drapier, S. El Hedri, A. Giampaolo, Th. A. Mueller, A. D. Santos, P. Paganini, B. Quilain, T. Ishizuka, T. Nakamura, J. S. Jang, J. G. Learned, K. Choi, S. Cao, L. H. V. Anthony, D. Martin, M. Scott, A. A. Sztuc, Y. Uchida, V. Berardi, M. G. Catanesi, E. Radicioni, N. F. Calabria, A. Langella, L. N. Machado, G. De Rosa, G. Collazuol, F. Iacob, M. Lamoureux, M. Mattiazzi, L. Ludovici, M. Gonin, G. Pronost, C. Fujisawa, Y. Maekawa, Y. Nishimura, R. Akutsu, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, N. Bhuiyan, T. Boschi, G. T. Burton, F. Di Lodovico, J. Gao, A. Goldsack, T. Katori, J. Migenda, M. Taani, Z. Xie, S. Zsoldos, Y. Kotsar, H. Ozaki, A. T. Suzuki, Y. Takeuchi, C. Bronner, J. Feng, T. Kikawa, M. Mori, T. Nakaya, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, P. Mehta, A. Tarrant, K. M. Tsui, Y. Fukuda, Y. Itow, H. Menjo, K. Ninomiya, J. Lagoda, S. M. Lakshmi, M. Mandal, P. Mijakowski, Y. S. Prabhu, J. Zalipska, M. Jia, J. Jiang, C. K. Jung, M. J. Wilking, C. Yanagisawa, M. Harada, H. Ishino, S. Ito, H. Kitagawa, Y. Koshio, F. Nakanishi, S. Sakai, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, J. Y. Yang, B. S. Yang, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, O. Stone, M. D. Thiesse, L. F. Thompson, H. Okazawa, S. B. Kim, E. Kwon, J. W. Seo, I. Yu, A. K. Ichikawa, K. D. Nakamura, S. Tairafune, K. Nishijima, M. Koshiba, K. Iwamoto, K. Nakagiri, Y. Nakajima, S. Shima, N. Taniuchi, M. Yokoyama, K. Martens, P. de Perio, M. R. Vagins, J. Xia, M. Kuze, S. Izumiyama, M. Inomoto, M. Ishitsuka, H. Ito, T. Kinoshita, R. Matsumoto, Y. Ommura, N. Shigeta, T. Suganuma, K. Yamauchi, J. F. Martin, H. A. Tanaka, T. Towstego, R. Gaur, V. Gousy-Leblanc, M. Hartz, A. Konaka, X. Li, N. W. Prouse, S. Chen, B. D. Xu, B. Zhang, M. Posiadala-Zezula, S. B. Boyd, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, Ll. Marti, A. Minamino, G. Pintaudi, S. Sano, S. Suzuki, K. Wada

    Physical Review D   107 ( 9 )   2023.5

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    DOI: 10.1103/physrevd.107.092009

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  • Search for Cosmic-Ray Boosted Sub-GeV Dark Matter Using Recoil Protons at Super-Kamiokande

    K. Abe, Y. Hayato, K. Hiraide, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, Y. Nakano, M. Nakahata, S. Nakayama, Y. Noguchi, K. Okamoto, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, S. Watanabe, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, J. Xia, S. Yoshida, G. D. Megias, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, B. W. Pointon, E. Kearns, J. L. Raaf, L. Wan, T. Wester, J. Bian, N. J. Griskevich, W. R. Kropp, S. Locke, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, L. Bernard, A. Coffani, O. Drapier, S. El Hedri, A. Giampaolo, Th. A. Mueller, A. D. Santos, P. Paganini, B. Quilain, T. Ishizuka, T. Nakamura, J. S. Jang, J. G. Learned, K. Choi, S. Cao, L. H. V. Anthony, D. Martin, M. Scott, A. A. Sztuc, Y. Uchida, V. Berardi, M. G. Catanesi, E. Radicioni, N. F. Calabria, L. N. Machado, G. De Rosa, G. Collazuol, F. Iacob, M. Lamoureux, M. Mattiazzi, L. Ludovici, M. Gonin, G. Pronost, C. Fujisawa, Y. Maekawa, Y. Nishimura, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, T. Boschi, F. Di Lodovico, J. Gao, A. Goldsack, T. Katori, J. Migenda, M. Taani, S. Zsoldos, Y. Kotsar, H. Ozaki, A. T. Suzuki, Y. Takeuchi, C. Bronner, J. Feng, T. Kikawa, M. Mori, T. Nakaya, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, P. Mehta, K. M. Tsui, Y. Fukuda, Y. Itow, H. Menjo, K. Ninomiya, J. Lagoda, S. M. Lakshmi, M. Mandal, P. Mijakowski, Y. S. Prabhu, J. Zalipska, M. Jia, J. Jiang, C. K. Jung, M. J. Wilking, C. Yanagisawa, M. Harada, H. Ishino, S. Ito, H. Kitagawa, Y. Koshio, F. Nakanishi, S. Sakai, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, F. Nova, J. Y. Yang, M. Malek, J. M. McElwee, O. Stone, M. D. Thiesse, L. F. Thompson, H. Okazawa, S. B. Kim, J. W. Seo, I. Yu, A. K. Ichikawa, K. D. Nakamura, S. Tairafune, K. Nishijima, K. Iwamoto, K. Nakagiri, Y. Nakajima, N. Taniuchi, M. Yokoyama, K. Martens, P. de Perio, M. R. Vagins, M. Kuze, S. Izumiyama, M. Inomoto, M. Ishitsuka, H. Ito, T. Kinoshita, R. Matsumoto, Y. Ommura, N. Shigeta, M. Shinoki, T. Suganuma, K. Yamauchi, J. F. Martin, H. A. Tanaka, T. Towstego, R. Akutsu, V. Gousy-Leblanc, M. Hartz, A. Konaka, N. W. Prouse, S. Chen, B. D. Xu, B. Zhang, M. Posiadala-Zezula, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, Ll. Marti, A. Minamino, G. Pintaudi, S. Sano, S. Suzuki, K. Wada

    Physical Review Letters   130 ( 3 )   2023.1

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    DOI: 10.1103/physrevlett.130.031802

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  • Search for proton decay via p→µ+K0 in 0.37 megaton-years exposure of Super-Kamiokande

    R. Matsumoto, K. Abe, Y. Hayato, K. Hiraide, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, Y. Nakano, M. Nakahata, S. Nakayama, Y. Noguchi, K. Okamoto, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, S. Watanabe, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, J. Xia, S. Yoshida, G. D. Megias, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, B. W. Pointon, E. Kearns, J. L. Raaf, L. Wan, T. Wester, J. Bian, N. J. Griskevich, W. R. Kropp, S. Locke, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, J. Y. Kim, I. T. Lim, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, L. Bernard, A. Coffani, O. Drapier, S. El Hedri, A. Giampaolo, Th. A. Mueller, A. D. Santos, P. Paganini, B. Quilain, T. Ishizuka, T. Nakamura, J. S. Jang, J. G. Learned, K. Choi, S. Cao, L. H. V. Anthony, D. Martin, M. Scott, A. A. Sztuc, Y. Uchida, V. Berardi, M. G. Catanesi, E. Radicioni, N. F. Calabria, L. N. Machado, G. De Rosa, G. Collazuol, F. Iacob, M. Lamoureux, M. Mattiazzi, L. Ludovici, M. Gonin, G. Pronost, C. Fujisawa, Y. Maekawa, Y. Nishimura, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, T. Boschi, F. Di Lodovico, J. Gao, A. Goldsack, T. Katori, J. Migenda, M. Taani, Z. Xie, S. Zsoldos, Y. Kotsar, H. Ozaki, A. T. Suzuki, Y. Takeuchi, S. Yamamoto, C. Bronner, J. Feng, T. Kikawa, M. Mori, T. Nakaya, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, P. Mehta, K. M. Tsui, A. Tarrant, Y. Fukuda, Y. Itow, H. Menjo, K. Ninomiya, J. Lagoda, S. M. Lakshmi, M. Mandal, P. Mijakowski, Y. S. Prabhu, J. Zalipska, M. Jia, J. Jiang, C. K. Jung, M. J. Wilking, C. Yanagisawa, M. Harada, H. Ishino, S. Ito, H. Kitagawa, Y. Koshio, W. Ma, F. Nakanishi, S. Sakai, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, A. Holin, F. Nova, J. Y. Yang, M. Malek, J. M. McElwee, O. Stone, M. D. Thiesse, L. F. Thompson, H. Okazawa, S. B. Kim, E. Kwon, J. W. Seo, I. Yu, A. K. Ichikawa, K. D. Nakamura, S. Tairafune, K. Nishijima, M. Koshiba, K. Iwamoto, K. Nakagiri, Y. Nakajima, S. Shima, N. Taniuchi, M. Yokoyama, K. Martens, P. de Perio, M. R. Vagins, M. Kuze, S. Izumiyama, M. Inomoto, M. Ishitsuka, H. Ito, T. Kinoshita, Y. Ommura, N. Shigeta, M. Shinoki, T. Suganuma, K. Yamauchi, J. F. Martin, H. A. Tanaka, T. Towstego, R. Akutsu, V. Gousy-Leblanc, M. Hartz, A. Konaka, X. Li, N. W. Prouse, S. Chen, B. D. Xu, B. Zhang, M. Posiadala-Zezula, S. B. Boyd, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, Ll. Marti, A. Minamino, G. Pintaudi, S. Sano, S. Suzuki, K. Wada

    Physical Review D   106 ( 7 )   2022.10

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    DOI: 10.1103/physrevd.106.072003

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  • Searching for Supernova Bursts in Super-Kamiokande IV

    M. Mori, K. Abe, Y. Hayato, K. Hiraide, K. Ieki, M. Ikeda, S. Imaizumi, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, Y. Nagao, M. Nakahata, Y. Nakano, S. Nakayama, Y. Noguchi, T. Okada, K. Okamoto, A. Orii, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, T. Tomiya, S. Watanabe, T. Yano, S. Yoshida, S. Han, T. Kajita, K. Okumura, T. Tashiro, X. Wang, J. Xia, G. D. Megias, D. Bravo-Berguño, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, S. Zsoldos, B. W. Pointon, F. D. M. Blaszczyk, E. Kearns, J. L. Raaf, J. L. Stone, L. Wan, T. Wester, J. Bian, N. J. Griskevich, W. R. Kropp, S. Locke, M. B. Smy, H. W. Sobel, V. Takhistov, Yankelevich A., J. Hill, J. Y. Kim, I. T. Lim, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, L. Bernard, A. Coffani, O. Drapier, S. El Hedri, A. Giampaolo, Th. A. Mueller, P. Paganini, B. Quilain, A. D. Santos, T. Ishizuka, T. Nakamura, J. S. Jang, J. G. Learned, L. H. V. Anthony, D. Martin, M. Scott, A. A. Sztuc, Y. Uchida, V. Berardi, M. G. Catanesi, E. Radicioni, N. F. Calabria, L. N. Machado, G. De Rosa, G. Collazuol, F. Iacob, M. Lamoureux, M. Mattiazzi, L. Ludovici, M. Gonin, G. Pronost, Y. Maekawa, Y. Nishimura, C. Fujisawa, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, H. Ozaki, T. Shiozawa, A. T. Suzuki, Y. Takeuchi, S. Yamamoto, Y. Kotsar, Y. Ashida, C. Bronner, J. Feng, S. Hirota, T. Kikawa, T. Nakaya, R. A. Wendell, K. Yasutome, N. McCauley, P. Mehta, K. M. Tsui, Y. Fukuda, Y. Itow, H. Menjo, K. Ninomiya, T. Niwa, M. Tsukada, J. Lagoda, S. M. Lakshmi, P. Mijakowski, J. Zalipska, M. Mandal, Y. S. Prabhu, J. Jiang, C. K. Jung, C. Vilela, M. J. Wilking, C. Yanagisawa, M. Jia, K. Hagiwara, M. Harada, T. Horai, H. Ishino, S. Ito, H. Kitagawa, Y. Koshio, W. Ma, F. Nakanishi, N. Piplani, S. Sakai, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, F. Nova, T. Boschi, J. Gao, A. Goldsack, T. Katori, F. Di Lodovico, J. Migenda, M. Taani, S. Zsoldos, J. Y. Yang, S. J. Jenkins, M. Malek, J. M. McElwee, O. Stone, M. D. Thiesse, L. F. Thompson, H. Okazawa, S. B. Kim, J. W. Seo, I. Yu, K. Nishijima, M. Koshiba, K. Nakagiri, Y. Nakajima, K. Iwamoto, N. Taniuchi, M. Yokoyama, K. Martens, P. de Perio, M. R. Vagins, M. Kuze, S. Izumiyama, T. Yoshida, M. Inomoto, M. Ishitsuka, H. Ito, T. Kinoshita, R. Matsumoto, K. Ohta, Y. Ommura, N. Shigeta, M. Shinoki, T. Suganuma, K. Yamauchi, J. F. Martin, H. A. Tanaka, T. Towstego, R. Akutsu, V. Gousy-Leblanc, M. Hartz, A. Konaka, N. W. Prouse, S. Chen, B. D. Xu, B. Zhang, M. Posiadala-Zezula, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, J. Walker, Ll. Marti, A. Minamino, K. Okamoto, G. Pintaudi, R. Sasaki, S. Sano, S. Suzuki, K. Wada, S. Cao, A. ichikawa, K. D. Nakamura, S. Tairafune, K. Choi

    The Astrophysical Journal   938 ( 1 )   35 - 35   2022.10

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    Super-Kamiokande has been searching for neutrino bursts characteristic of core-collapse supernovae continuously, in real time, since the start of operations in 1996. The present work focuses on detecting more distant supernovae whose event rate may be too small to trigger in real time, but may be identified using an offline approach. The analysis of data collected from 2008 to 2018 found no evidence of distant supernovae bursts. This establishes an upper limit of 0.29 yr−1 on the rate of core-collapse supernovae out to 100 kpc at 90% C.L. For supernovae that fail to explode and collapse directly to black holes the limit reaches to 300 kpc.

    DOI: 10.3847/1538-4357/ac8f41

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  • Neutron tagging following atmospheric neutrino events in a water Cherenkov detector

    K. Abe, Y. Haga, Y. Hayato, K. Hiraide, K. Ieki, M. Ikeda, S. Imaizumi, K. Iyogi, J. Kameda, Y. Kanemura, Y. Kataoka, Y. Kato, Y. Kishimoto, S. Miki, S. Mine, M. Miura, T. Mochizuki, S. Moriyama, Y. Nagao, M. Nakahata, T. Nakajima, Y. Nakano, S. Nakayama, T. Okada, K. Okamoto, A. Orii, K. Sato, H. Sekiya, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, S. Tasaka, T. Tomura, K. Ueno, S. Watanabe, T. Yano, T. Yokozawa, S. Han, T. Irvine, T. Kajita, I. Kametani, K. Kaneyuki, K.P. Lee, T. McLachlan, K. Okumura, E. Richard, T. Tashiro, R. Wang, J. Xia, G.D. Megias, D. Bravo-Berguño, L. Labarga, B. Zaldivar, M. Goldhaber, F.d.M. Blaszczyk, J. Gustafson, C. Kachulis, E. Kearns, J.L. Raaf, J.L. Stone, L.R. Sulak, S. Sussman, L. Wan, T. Wester, B.W. Pointon, J. Bian, G. Carminati, M. Elnimr, N.J. Griskevich, W.R. Kropp, S. Locke, A. Renshaw, M.B. Smy, H.W. Sobel, V. Takhistov, P. Weatherly, K.S. Ganezer, B.L. Hartfiel, J. Hill, W.E. Keig, N. Hong, J.Y. Kim, I.T. Lim, R.G. Park, T. Akiri, B. Bodur, A. Himmel, Z. Li, E. O'Sullivan, K. Scholberg, C.W. Walter, T. Wongjirad, L. Bernard, A. Coffani, O. Drapier, S. El Hedri, A. Giampaolo, J. Imber, Th.A. Mueller, P. Paganini, B. Quilain, T. Ishizuka, T. Nakamura, J.S. Jang, K. Choi, J.G. Learned, S. Matsuno, S.N. Smith, J. Amey, L.H.V. Anthony, R.P. Litchfield, W.Y. Ma, D. Marin, A.A. Sztuc, Y. Uchida, M.O. Wascko, V. Berardi, M.G. Catanesi, R.A. Intonti, E. Radicioni, N.F. Calabria, G. De Rosa, L.N. Machado, G. Collazuol, F. Iacob, M. Lamoureux, N. Ospina, L. Ludovici, M. Gonin, G. Pronost, Y. Maekawa, Y. Nishimura, S. Cao, M. Friend, T. Hasegawa, T. Ishida, T. Ishii, M. Jakkapu, T. Kobayashi, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, T. Boschi, F. Di Lodovico, J. Migenda, S. Molina Sedgwick, M. Taani, S. Zsoldos, K.E. Abe, M. Hasegawa, Y. Isobe, Y. Kotsar, H. Miyabe, H. Ozaki, T. Shiozawa, T. Sugimoto, A.T. Suzuki, Y. Takeuchi, S. Yamamoto, A. Ali, Y. Ashida, C. Bronner, J. Feng, T. Hayashino, T. Hiraki, S. Hirota, K. Huang, M. Jiang, T. Kikawa, M. Mori, A. Murakami, KE. Nakamura, T. Nakaya, N.D. Patel, K. Suzuki, S. Takahashi, K. Tateishi, R.A. Wendell, K. Yasutome, P. Fernandez, N. McCauley, P. Mehta, A. Pritchard, K.M. Tsui, Y. Fukuda, Y. Itow, H. Menjo, G. Mitsuka, M. Murase, F. Muto, T. Niwa, T. Suzuki, M. Tsukada, K. Frankiewicz, P. Mijakowski, J. Hignight, J. Jiang, C.K. Jung, X. Li, J.L. Palomino, G. Santucci, C. Vilela, M.J. Wilking, C. Yanagisawa, D. Fukuda, K. Hagiwara, M. Harada, T. Horai, H. Ishino, S. Ito, T. Kayano, A. Kibayashi, H. Kitagawa, Y. Koshio, W. Ma, T. Mori, H. Nagata, N. Piplani, S. Sakai, M. Sakuda, Y. Takahira, C. Xu, R. Yamaguchi, Y. Kuno, G. Barr, D. Barrow, L. Cook, A. Goldsack, S. Samani, C. Simpson, D. Wark, F. Nova, R. Tacik, J.Y. Yang, A. Cole, S.J. Jenkins, M. Malek, J.M. McElwee, O. Stone, M.D. Thiesse, L.F. Thompson, H. Okazawa, Y. Choi, S.B. Kim, I. Yu, A.K. Ichikawa, K. Nakamura, K. Ito, K. Nishijima, R.G. Calland, P. de Perio, K. Martens, M. Murdoch, M.R. Vagins, M. Koshiba, Y. Totsuka, K. Iwamoto, Y. Nakajima, N. Ogawa, Y. Suda, M. Yokoyama, D. Hamabe, S. Izumiyama, M. Kuze, Y. Okajima, M. Tanaka, T. Yoshida, M. Inomoto, M. Ishitsuka, H. Ito, R. Matsumoto, K. Ohta, M. Shinoki, J.F. Martin, C.M. Nantais, H.A. Tanaka, T. Towstego, R. Akutsu, M. Hartz, A. Konaka, N.W. Prouse, S. Chen, B.D. Xu, Y. Zhang, S. Berkman, S. Tobayama, K. Connolly, R.J. Wilkes, M. Posiadala-Zezula, D. Hadley, B. Richards, B. Jamieson, J. Walker, Ll. Marti, A. Minamino, K. Okamoto, G. Pintaudi, S. Sano, R. Sasaki

    Journal of Instrumentation   17 ( 10 )   P10029 - P10029   2022.10

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    Publishing type:Research paper (scientific journal)   Publisher:IOP Publishing  

    Abstract

    We present the development of neutron-tagging techniques in Super-Kamiokande IV using a neural network analysis. The detection efficiency of neutron capture on hydrogen is estimated to be 26%, with a mis-tag rate of 0.016 per neutrino event. The uncertainty of the tagging efficiency is estimated to be 9.0%. Measurement of the tagging efficiency with data from an Americium-Beryllium calibration agrees with this value within 10%. The tagging procedure was performed on 3,244.4 days of SK-IV atmospheric neutrino data, identifying 18,091 neutrons in 26,473 neutrino events. The fitted neutron capture lifetime was measured as 218±9 μs.

    DOI: 10.1088/1748-0221/17/10/p10029

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  • Pre-supernova Alert System for Super-Kamiokande

    L. N. Machado, K. Abe, Y. Hayato, K. Hiraide, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, Y. Nakano, M. Nakahata, S. Nakayama, Y. Noguchi, K. Okamoto, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, S. Watanabe, T. Yano, P. de Perio, K. Martens, M. R. Vagins, J. Bian, N. J. Griskevich, W. R. Kropp, S. Locke, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, S. Han, T. Kajita, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, J. Xia, S. Yoshida, G. D. Megias, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, B. W. Pointon, R. Akutsu, V. Gousy-Leblanc, M. Hartz, A. Konaka, N. W. Prouse, E. Kearns, J. L. Raaf, L. Wan, T. Wester, J. Hill, J. Y. Kim, I. T. Lim, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, L. Bernard, A. Coffani, O. Drapier, S. El Hedri, A. Giampaolo, Th. A. Mueller, A. D. Santos, P. Paganini, B. Quilain, T. Ishizuka, T. Nakamura, J. S. Jang, J. G. Learned, S. Cao, K. Choi, L. H. V. Anthony, D. Martin, M. Scott, A. A. Sztuc, Y. Uchida, V. Berardi, M. G. Catanesi, E. Radicioni, N. F. Calabria, G. De Rosa, G. Collazuol, F. Iacob, M. Lamoureux, M. Mattiazzi, L. Ludovici, M. Gonin, G. Pronost, C. Fujisawa, Y. Maekawa, Y. Nishimura, R. Sasaki, M. Friend, T. Hasegawa, T. Ishida, M. Jakkapu, T. Kobayashi, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, T. Boschi, F. Di Lodovico, J. Gao, A. Goldsack, T. Katori, J. Migenda, M. Taani, S. Zsoldos, Y. Kotsar, H. Ozaki, A. T. Suzuki, Y. Takeuchi, S. Yaamoto, C. Bronner, J. Feng, T. Kikawa, M. Mori, T. Nakaya, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, P. Mehta, K. M. Tsui, Y. Fukuda, Y. Itow, H. Menjo, K. Ninomiya, J. Lagoda, S. M. Lakshmi, M. Mandal, P. Mijakowski, Y. S. Prabhu, J. Zalipska, M. Jia, J. Jiang, C. K. Jung, M. J. Wilking, C. Yanagisawa, M. Harada, H. Ishino, S. Ito, H. Kitagawa, Y. Koshio, W. Ma, F. Nakanishi, S. Sakai, G. Barr, D. Barrow, L. Cook, S. Samani, D. Wark, F. Nova, J. Y. Yang, M. Malek, J. M. McElwee, O. Stone, M. D. Thiesse, L. F. Thompson, H. Okazawa, S. B. Kim, J. W. Seo, I. Yu, A. K. Ichikawa, K. D. Nakamura, S. Tairafune, K. Nishijima, K. Iwamoto, K. Nakagiri, Y. Nakajima, N. Taniuchi, M. Yokoyama, S. Izumiyama, M. Kuze, M. Inomoto, M. Ishitsuka, H. Ito, T. Kinoshita, R. Matsumoto, Y. Ommura, N. Shigeta, M. Shinoki, T. Suganuma, M. Yonenaga, J. F. Martin, H. A. Tanaka, T. Towstego, S. Chen, B. D. Xu, B. Zhang, M. Posiadala-Zezula, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B. Jamieson, Ll. Marti, A. Minamino, G. Pintaudi, S. Sano, S. Suzuki, K. Wada

    The Astrophysical Journal   935 ( 1 )   40 - 40   2022.8

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    Publishing type:Research paper (scientific journal)   Publisher:American Astronomical Society  

    Abstract

    In 2020, the Super-Kamiokande (SK) experiment moved to a new stage (SK-Gd) in which gadolinium (Gd) sulfate octahydrate was added to the water in the detector, enhancing the efficiency to detect thermal neutrons and consequently improving the sensitivity to low energy electron anti-neutrinos from inverse beta decay (IBD) interactions. SK-Gd has the potential to provide early alerts of incipient core-collapse supernovae through detection of electron anti-neutrinos from thermal and nuclear processes responsible for the cooling of massive stars before the gravitational collapse of their cores. These pre-supernova neutrinos emitted during the silicon burning phase can exceed the energy threshold for IBD reactions. We present the sensitivity of SK-Gd to pre-supernova stars and the techniques used for the development of a pre-supernova alarm based on the detection of these neutrinos in SK, as well as prospects for future SK-Gd phases with higher concentrations of Gd. For the current SK-Gd phase, high-confidence alerts for Betelgeuse could be issued up to 9 hr in advance of the core collapse itself.

    DOI: 10.3847/1538-4357/ac7f9c

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  • First gadolinium loading to Super-Kamiokande

    K. Abe, C. Bronner, Y. Hayato, K. Hiraide, M. Ikeda, S. Imaizumi, J. Kameda, Y. Kanemura, Y. Kataoka, S. Miki, M. Miura, S. Moriyama, Y. Nagao, M. Nakahata, S. Nakayama, T. Okada, K. Okamoto, A. Orii, G. Pronost, H. Sekiya, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, S. Watanabe, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, J. Xia, G.D. Megias, D. Bravo-Berguño, L. Labarga, Ll. Marti, B. Zaldivar, B.W. Pointon, F.d.M. Blaszczyk, E. Kearns, J.L. Raaf, J.L. Stone, L. Wan, T. Wester, J. Bian, N.J. Griskevich, W.R. Kropp, S. Locke, S. Mine, M.B. Smy, H.W. Sobel, V. Takhistov, J. Hill, J.Y. Kim, I.T. Lim, R.G. Park, B. Bodur, K. Scholberg, C.W. Walter, L. Bernard, A. Coffani, O. Drapier, S. El Hedri, A. Giampaolo, M. Gonin, Th.A. Mueller, P. Paganini, B. Quilain, T. Ishizuka, T. Nakamura, J.S. Jang, J.G. Learned, L.H.V. Anthony, D. Martin, M. Scott, A.A. Sztuc, Y. Uchida, S. Cao, V. Berardi, M.G. Catanesi, E. Radicioni, N.F. Calabria, L.N. Machado, G. De Rosa, G. Collazuol, F. Iacob, M. Lamoureux, M. Mattiazzi, N. Ospina, L. Ludovici, Y. Maekawa, Y. Nishimura, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, M. Jakkapu, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, T. Boschi, J. Gao, F. Di Lodovico, J. Migenda, M. Taani, S. Zsoldos, Y. Kotsar, Y. Nakano, H. Ozaki, T. Shiozawa, A.T. Suzuki, Y. Takeuchi, S. Yamamoto, A. Ali, Y. Ashida, J. Feng, S. Hirota, T. Kikawa, M. Mori, T. Nakaya, R.A. Wendell, K. Yasutome, P. Fernandez, N. McCauley, P. Mehta, K.M. Tsui, Y. Fukuda, Y. Itow, H. Menjo, T. Niwa, K. Sato, M. Tsukada, J. Lagoda, S.M. Lakshmi, P. Mijakowski, J. Zalipska, J. Jiang, C.K. Jung, C. Vilela, M.J. Wilking, C. Yanagisawa, K. Hagiwara, M. Harada, T. Horai, H. Ishino, S. Ito, F. Kitagawa, Y. Koshio, W. Ma, N. Piplani, S. Sakai, G. Barr, D. Barrow, L. Cook, A. Goldsack, S. Samani, D. Wark, F. Nova, J.Y. Yang, S.J. Jenkins, M. Malek, J.M. McElwee, O. Stone, M.D. Thiesse, L.F. Thompson, H. Okazawa, S.B. Kim, J.W. Seo, I. Yu, A.K. Ichikawa, K. Nakamura, K. Nishijima, M. Koshiba, K. Iwamoto, Y. Nakajima, N. Ogawa, M. Yokoyama, K. Martens, M.R. Vagins, M. Kuze, S. Izumiyama, T. Yoshida, M. Inomoto, M. Ishitsuka, H. Ito, T. Kinoshita, R. Matsumoto, K. Ohta, M. Shinoki, T. Suganuma, J.F. Martin, H.A. Tanaka, T. Towstego, R. Akutsu, M. Hartz, A. Konaka, P. de Perio, N.W. Prouse, S. Chen, B.D. Xu, M. Posiadala-Zezula, D. Hadley, M. O’Flaherty, B. Richards, B. Jamieson, J. Walker, A. Minamino, K. Okamoto, G. Pintaudi, S. Sano, R. Sasaki

    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment   1027   166248 - 166248   2022.3

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.nima.2021.166248

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  • Search for Neutrinos in Coincidence with Gravitational Wave Events from the LIGO–Virgo O3a Observing Run with the Super-Kamiokande Detector

    K. Abe, C. Bronner, Y. Hayato, M. Ikeda, S. Imaizumi, J. Kameda, Y. Kanemura, Y. Kataoka, S. Miki, M. Miura, S. Moriyama, Y. Nagao, M. Nakahata, S. Nakayama, T. Okada, K. Okamoto, A. Orii, G. Pronost, H. Sekiya, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, S. Watanabe, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, R. Wang, J. Xia, G. D. Megias, D. Bravo-Berguño, L. Labarga, Ll. Marti, B. Zaldivar, B. W. Pointon, F. d. M. Blaszczyk, E. Kearns, J. L. Raaf, J. L. Stone, L. Wan, T. Wester, J. Bian, N. J. Griskevich, W. R. Kropp, S. Locke, S. Mine, M. B. Smy, H. W. Sobel, V. Takhistov, P. Weatherly, J. Hill, J. Y. Kim, I. T. Lim, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, L. Bernard, A. Coffani, O. Drapier, S. El Hedri, A. Giampaolo, M. Gonin, Th. A. Mueller, P. Paganini, B. Quilain, T. Ishizuka, T. Nakamura, J. S. Jang, J. G. Learned, L. H. V. Anthony, D. G. R. Martin, A. A. Sztuc, Y. Uchida, V. Berardi, M. G. Catanesi, E. Radicioni, N. F. Calabria, L. N. Machado, G. De Rosa, G. Collazuol, F. Iacob, M. Lamoureux, N. Ospina, L. Ludovici, Y. Maekawa, Y. Nishimura, S. Cao, M. Friend, T. Hasegawa, T. Ishida, M. Jakkapu, T. Kobayashi, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, Y. Kotsar, Y. Nakano, H. Ozaki, T. Shiozawa, A. T. Suzuki, Y. Takeuchi, S. Yamamoto, A. Ali, Y. Ashida, J. Feng, S. Hirota, T. Kikawa, M. Mori, T. Nakaya, R. A. Wendell, K. Yasutome, P. Fernandez, N. McCauley, P. Mehta, A. Pritchard, K. M. Tsui, Y. Fukuda, Y. Itow, H. Menjo, T. Niwa, K. Sato, M. Tsukada, P. Mijakowski, J. Jiang, C. K. Jung, C. Vilela, M. J. Wilking, C. Yanagisawa, K. Hagiwara, M. Harada, T. Horai, H. Ishino, S. Ito, Y. Koshio, H. Kitagawa, W. Ma, N. Piplani, S. Sakai, Y. Kuno, G. Barr, D. Barrow, L. Cook, A. Goldsack, S. Samani, C. Simpson, D. Wark, F. Nova, T. Boschi, F. Di Lodovico, J. Migenda, S. Molina Sedgwick, M. Taani, S. Zsoldos, J. Y. Yang, S. J. Jenkins, M. Malek, J. M. McElwee, O. Stone, M. D. Thiesse, L. F. Thompson, H. Okazawa, S. B. Kim, I. Yu, K. Nishijima, M. Koshiba, K. Iwamoto, Y. Nakajima, N. Ogawa, M. Yokoyama, K. Martens, M. R. Vagins, S. Izumiyama, M. Kuze, M. Tanaka, T. Yoshida, M. Inomoto, M. Ishitsuka, H. Ito, R. Matsumoto, K. Ohta, M. Shinoki, J. F. Martin, H. A. Tanaka, T. Towstego, R. Akutsu, M. Hartz, A. Konaka, P. de Perio, N. W. Prouse, S. Chen, B. D. Xu, M. Posiadala-Zezula, D. Hadley, B. Richards, B. Jamieson, J. Walker, A. Minamino, K. Okamoto, G. Pintaudi, S. Sano, R. Sasaki, A. K. Ichikawa, K. Nakamura

    The Astrophysical Journal   918 ( 2 )   78 - 78   2021.9

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    Publishing type:Research paper (scientific journal)   Publisher:American Astronomical Society  

    Abstract

    The Super-Kamiokande detector can be used to search for neutrinos in time coincidence with gravitational waves detected by the LIGO–Virgo Collaboration (LVC). Both low-energy (7–100 MeV) and high-energy (0.1–105 GeV) samples were analyzed in order to cover a very wide neutrino spectrum. Follow-ups of 36 (out of 39) gravitational waves reported in the GWTC-2 catalog were examined; no significant excess above the background was observed, with 10 (24) observed neutrinos compared with 4.8 (25.0) expected events in the high-energy (low-energy) samples. A statistical approach was used to compute the significance of potential coincidences. For each observation, p-values were estimated using neutrino direction and LVC sky map; the most significant event (GW190602_175927) is associated with a post-trial p-value of 7.8% (1.4σ). Additionally, flux limits were computed independently for each sample and by combining the samples. The energy emitted as neutrinos by the identified gravitational wave sources was constrained, both for given flavors and for all flavors assuming equipartition between the different flavors, independently for each trigger and by combining sources of the same nature.

    DOI: 10.3847/1538-4357/ac0d5a

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  • Diffuse Supernova Neutrino Background search at Super-Kamiokande with neutron tagging

    Alberto Giampaolo, Sonia ElHedri, Ko Abe, Christophe Bronner, Yoshinari Hayato, Katsuki Hiraide, Motoyasu Ikeda, Jun Kameda, Yuki Kanemura, Yousuku Kataoka, Shintaro Miki, Makoto Miura, Shigetaka Moriyama, Yoshiki Nagao, Masayuki NAKAHATA, Shoei Nakayama, Kohei Okamoto, Guillaume Pronost, Hiroyuki Sekiya, Masato Shiozawa, Yutaro Sonoda, Yoichiro Suzuki, Atsushi Takeda, Yasuhiro Takemoto, Akira Takenaka, HIDEKAZU TANAKA, Shuhei Watanabe, Takatomi Yano, Seungho Han, Takaaki Kajita, Kimihiro Okumura, Takuya Tashiro, Junjie Xia, Guillermo Megias, Luis Labarga, Lluis Marti, Bryan Zaldivar, Barry W. Pointon, Edward Kearns, Jennifer L. Raaf, Linyan Wan, Thomas Wester, Jianming Bian, Jeff N. Griskevich, William R. Kropp, Scott Locke, Shunichi Mine, Michael Smy, Henry W. Sobel, Volodymyr Takhistov, James Hill, Jae Yool Kim, In Taek Lim, Ryeong Gyoon Park, Baran Bodur, Kate Scholberg, CHRIS WALTER, Laura Bernard, Alice Coffani, Olivier Drapier, Michel Gonin, Thomas A. Mueller, Pascal Paganini, Benjamin Quilain, Takeharu Ishizuka, Taku Nakamura, Jae Seung Jang, John G. Learned, Son Cao, Lauren H.V. Anthony, Daniel Martin, Mark Scott, Artur A. Sztuc, Yoshi Uchida, Vincenzo Berardi, Maria Gabriella Catanesi, Emilio Radicioni, Nicola F. Calabria, Lucas N. Machado, Gianfranca De Rosa, Gianmaria Collazuol, Fabio Iacob, Mathieu Lamoureux, Marco Mattiazzi, Natalv Ospina, Lucio Ludovici, Yuto Maekawa, Yasuhiro Nishimura, Megan Friend, Takuya Hasegawa, Taku Ishida, Takashi Kobayashi, Mahesh Jakkapu, Tsunayuki Matsubara, Takeshi Nakadaira, Kenzo Nakamura, Yuichi Oyama, Ken Sakashita, Tetsuro Sekiguchi, Toshifumi Tsukamoto, Tommaso Boschi, Francesca Di Lodovico, Jingyuan Gao, Jost Migenda, Mahdi Taani, Stephane Zsoldos, Yuuki Nakano, Hironori Ozaki, Atsumu Suzuki, Yasuo Takeuchi, Shotaro Yamamoto, Yurii Kotsar, Ajmi Ali, Jiahui Feng, Tatsuya Kikawa, Masamitsu Mori, Tsuyoshi Nakaya, Roger Wendell, Kenji Yasutome, Pablo Fernández, Neil McCauley, Pruthvi Mehta, Ka Ming Tsui, Yoshiyuki Fukuda, Yoshitaka Itow, Hiroaki Menjo, Kazufumi Sato, Justyna Lagoda, S. Mohan Lakshmi, Piotr Mijakowski, Joanna Zalipska, Junjie Jiang, Chang K. Jung, Cristovao Vilela, Michael Wilking, Chiaki Yanagisawa, Masayuki Harada, Hirokazu ISHINO, Shintaro Ito, Hussain Kitagawa, Yusuke Koshio, Wenjie Ma, Nishtha Piplani, Seiya Sakai, Giles Barr, Danial Barrow, Laurence Cook, Alexander Goldsack, Soniya Samani, David Wark, Federico Nova, Jeong Yeol Yang, Sam J. Jenkins, Matthew Malek, Jordan McElwee, Owen Stone, Matthew D. Thiesse, Lee F. Thompson, Hiroko Okazawa, Soo Bong Kim, Intae Yu, Atsuko Ichikawa, Kiseki Nakamura, Kyoshi Nishijima, Masatoshi Koshiba, Konosuke Iwamoto, Yasuhiro Nakajima, Natsumi Ogawa, Masashi Yokoyama, Kai Martens, Mark Vagins, Masahiro Kuze, Shota Izumiyama, Michitaka Inomoto, Masaki Ishitsuka, Hiroshi Ito, Tatsushi Kinoshita, Ryo Matsumoto, Masataka Shinoki, Takuto Suganuma, John Fraser Martin, Hirohisa Tanaka, Trevor Towstego, Ryosuke Akutsu, Patrick de Perio, Mark Hartz, Akira Konaka, Nick Prouse, Shaomin Chen, Benda D. Xu, Magdalena Posiadala-Zezula, David Hadley, Marcus O'Flaherty, Benjamin Richards, Blair Jamieson, John Walker, Akihiro Minamino, Ggiorgio Pintaudi, Shiochi Sano, Ryota Sasaki

    Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)   1154 - 1154   2021.8

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    Publishing type:Research paper (international conference proceedings)   Publisher:Sissa Medialab  

    DOI: 10.22323/1.395.1154

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  • Low energy radioactivity BG model in Super-Kamiokande detector from SK-IV data

    Guillaume Pronost, Ko Abe, Christophe Bronner, Yoshinari Hayato, Katsuki Hiraide, Motoyasu Ikeda, Jun Kameda, Yuki Kanemura, Yousuku Kataoka, Shintaro Miki, Makoto Miura, Shigetaka Moriyama, Yoshiki Nagao, Masayuki NAKAHATA, Shoei Nakayama, Kohei Okamoto, Hiroyuki Sekiya, Masato Shiozawa, Yutaro Sonoda, Yoichiro Suzuki, Atsushi Takeda, Yasuhiro Takemoto, Akira Takenaka, HIDEKAZU TANAKA, Shuhei Watanabe, Takatomi Yano, Seungho Han, Takaaki Kajita, Kimihiro Okumura, Takuya Tashiro, Junjie Xia, Guillermo Megias, Luis Labarga, Lluis Marti, Bryan Zaldivar, Barry W. Pointon, Edward Kearns, Jennifer L. Raaf, Linyan Wan, Thomas Wester, Jianming Bian, N. Jeff Griskevich, William R. Kropp, Scott Locke, Shunichi Mine, Michael Smy, Henry W. Sobel, Volodymyr Takhistov, James Hill, Jae Yool Kim, In Taek Lim, Ryeong Gyoon Park, Baran Bodur, Kate Scholberg, CHRIS WALTER, Laura Bernard, Alice Coffani, Olivier Drapier, Sonia ElHedri, Alberto Giampaolo, Michel Gonin, Thomas A. Mueller, Pascal Paganini, Benjamin Quilain, Takeharu Ishizuka, Taku Nakamura, Jae Seung Jang, John G. Learned, Son Cao, Lauren H.V. Anthony, Daniel Martin, Mark Scott, Artur A. Sztuc, Yoshi Uchida, Vincenzo Berardi, Maria Gabriella Catanesi, Emilio Radicioni, Nicola F. Calabria, Lucas N. Machado, Gianfranca De Rosa, Gianmaria Collazuol, Fabio Iacob, Mathieu Lamoureux, Marco Mattiazzi, Natalv Ospina, Lucio Ludovici, Yuto Maekawa, Yasuhiro Nishimura, Megan Friend, Takuya Hasegawa, Taku Ishida, Takashi Kobayashi, Mahesh Jakkapu, Tsunayuki Matsubara, Takeshi Nakadaira, Kenzo Nakamura, Yuichi Oyama, Ken Sakashita, Tetsuro Sekiguchi, Toshifumi Tsukamoto, Tommaso Boschi, Francesca Di Lodovico, Jingyuan Gao, Jost Migenda, Mahdi Taani, Stephane Zsoldos, Yuuki Nakano, Hironori Ozaki, Atsumu Suzuki, Yasuo Takeuchi, Shotaro Yamamoto, Yurii Kotsar, Ajmi Ali, Jiahui Feng, Tatsuya Kikawa, Masamitsu Mori, Tsuyoshi Nakaya, Roger Wendell, Kenji Yasutome, Pablo Fernández, Neil McCauley, Pruthvi Mehta, Ka Ming Tsui, Yoshiyuki Fukuda, Yoshitaka Itow, Hiroaki Menjo, Kazufumi Sato, Justyna Lagoda, S. Mohan Lakshmi, Piotr Mijakowski, Joanna Zalipska, Junjie Jiang, Chang K. Jung, Cristovao Vilela, Michael Wilking, Chiaki Yanagisawa, Masayuki Harada, Hirokazu ISHINO, Shintaro Ito, Hussain Kitagawa, Yusuke Koshio, Wenjie Ma, Nishtha Piplani, Seiya Sakai, Giles Barr, Danial Barrow, Laurence Cook, Alexander Goldsack, Soniya Samani, David Wark, Federico Nova, Jeong Yeol Yang, Sam J. Jenkins, Matthew Malek, Jordan McElwee, Owen Stone, Matthew D. Thiesse, Lee F. Thompson, Hiroko Okazawa, Soo Bong Kim, Intae Yu, Atsuko Ichikawa, Kiseki Nakamura, Kyoshi Nishijima, Masatoshi Koshiba, Konosuke Iwamoto, Yasuhiro Nakajima, Natsumi Ogawa, Masashi Yokoyama, Kai Martens, Mark Vagins, Masahiro Kuze, Shota Izumiyama, Michitaka Inomoto, Masaki Ishitsuka, Hiroshi Ito, Tatsushi Kinoshita, Ryo Matsumoto, Masataka Shinoki, Takuto Suganuma, John Fraser Martin, Hirohisa Tanaka, Trevor Towstego, Ryosuke Akutsu, Patrick de Perio, Mark Hartz, Akira Konaka, Nick Prouse, Shaomin Chen, Benda D. Xu, Magdalena Posiadala-Zezula, David Hadley, Marcus O'Flaherty, Benjamin Richards, Blair Jamieson, John Walker, Akihiro Minamino, Ggiorgio Pintaudi, Shiochi Sano, Ryota Sasaki

    Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)   1046 - 1046   2021.7

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    Publishing type:Research paper (international conference proceedings)   Publisher:Sissa Medialab  

    DOI: 10.22323/1.395.1046

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  • Follow-up of GWTC-2 gravitational wave events with neutrinos from the Super-Kamiokande detector

    Mathieu Lamoureux, Ko Abe, Christophe Bronner, Yoshinari Hayato, Katsuki Hiraide, Motoyasu Ikeda, Jun Kameda, Yuki Kanemura, Yousuku Kataoka, Shintaro Miki, Makoto Miura, Shigetaka Moriyama, Yoshiki Nagao, Masayuki NAKAHATA, Shoei Nakayama, Kohei Okamoto, Guillaume Pronost, Hiroyuki Sekiya, Masato Shiozawa, Yutaro Sonoda, Yoichiro Suzuki, Atsushi Takeda, Yasuhiro Takemoto, Akira Takenaka, HIDEKAZU TANAKA, Shuhei Watanabe, Takatomi Yano, Seungho Han, Takaaki Kajita, Kimihiro Okumura, Takuya Tashiro, Junjie Xia, Guillermo Megias, Luis Labarga, Lluis Marti, Bryan Zaldivar, Barry W. Pointon, Edward Kearns, Jennifer L. Raaf, Linyan Wan, Thomas Wester, Jianming Bian, N. Jeff Griskevich, William R. Kropp, Scott Locke, Shunichi Mine, Michael Smy, Henry W. Sobel, Volodymyr Takhistov, James Hill, Jae Yool Kim, In Taek Lim, Ryeong Gyoon Park, Baran Bodur, Kate Scholberg, CHRIS WALTER, Laura Bernard, Alice Coffani, Olivier Drapier, Sonia ElHedri, Alberto Giampaolo, Michel Gonin, Thomas A. Mueller, Pascal Paganini, Benjamin Quilain, Takeharu Ishizuka, Taku Nakamura, Jae Seung Jang, John G. Learned, Son Cao, Lauren H.V. Anthony, Daniel Martin, Mark Scott, Artur A. Sztuc, Yoshi Uchida, Vincenzo Berardi, Maria Gabriella Catanesi, Emilio Radicioni, Nicola F. Calabria, Lucas N. Machado, Gianfranca De Rosa, Gianmaria Collazuol, Fabio Iacob, Marco Mattiazzi, Natalv Ospina, Lucio Ludovici, Yuto Maekawa, Yasuhiro Nishimura, Megan Friend, Takuya Hasegawa, Taku Ishida, Takashi Kobayashi, Mahesh Jakkapu, Tsunayuki Matsubara, Takeshi Nakadaira, Kenzo Nakamura, Yuichi Oyama, Ken Sakashita, Tetsuro Sekiguchi, Toshifumi Tsukamoto, Tommaso Boschi, Francesca Di Lodovico, Jingyuan Gao, Jost Migenda, Mahdi Taani, Stephane Zsoldos, Yuuki Nakano, Hironori Ozaki, Atsumu Suzuki, Yasuo Takeuchi, Shotaro Yamamoto, Yurii Kotsar, Ajmi Ali, Jiahui Feng, Tatsuya Kikawa, Masamitsu Mori, Tsuyoshi Nakaya, Roger Wendell, Kenji Yasutome, Pablo Fernández, Neil McCauley, Pruthvi Mehta, Ka Ming Tsui, Yoshiyuki Fukuda, Yoshitaka Itow, Hiroaki Menjo, Kazufumi Sato, Justyna Lagoda, S. Mohan Lakshmi, Piotr Mijakowski, Joanna Zalipska, Junjie Jiang, Chang K. Jung, Cristovao Vilela, Michael Wilking, Chiaki Yanagisawa, Masayuki Harada, Hirokazu ISHINO, Shintaro Ito, Hussain Kitagawa, Yusuke Koshio, Wenjie Ma, Nishtha Piplani, Seiya Sakai, Giles Barr, Danial Barrow, Laurence Cook, Alexander Goldsack, Soniya Samani, David Wark, Federico Nova, Jeong Yeol Yang, Sam J. Jenkins, Matthew Malek, Jordan McElwee, Owen Stone, Matthew D. Thiesse, Lee F. Thompson, Hiroko Okazawa, Soo Bong Kim, Intae Yu, Atsuko Ichikawa, Kiseki Nakamura, Kyoshi Nishijima, Masatoshi Koshiba, Konosuke Iwamoto, Yasuhiro Nakajima, Natsumi Ogawa, Masashi Yokoyama, Kai Martens, Mark Vagins, Masahiro Kuze, Shota Izumiyama, Michitaka Inomoto, Masaki Ishitsuka, Hiroshi Ito, Tatsushi Kinoshita, Ryo Matsumoto, Masataka Shinoki, Takuto Suganuma, John Fraser Martin, Hirohisa Tanaka, Trevor Towstego, Ryosuke Akutsu, Patrick de Perio, Mark Hartz, Akira Konaka, Nick Prouse, Shaomin Chen, Benda D. Xu, Magdalena Posiadala-Zezula, David Hadley, Marcus O'Flaherty, Benjamin Richards, Blair Jamieson, John Walker, Akihiro Minamino, Ggiorgio Pintaudi, Shiochi Sano, Ryota Sasaki

    Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)   947 - 947   2021.7

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    Publishing type:Research paper (international conference proceedings)   Publisher:Sissa Medialab  

    DOI: 10.22323/1.395.0947

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  • Neutron-antineutron oscillation search using a 0.37 megaton-years exposure of Super-Kamiokande

    K. Abe, C. Bronner, Y. Hayato, M. Ikeda, S. Imaizumi, H. Ito, J. Kameda, Y. Kataoka, M. Miura, S. Moriyama, Y. Nagao, M. Nakahata, Y. Nakajima, S. Nakayama, T. Okada, K. Okamoto, A. Orii, G. Pronost, H. Sekiya, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, T. Yano, R. Akutsu, S. Han, T. Kajita, K. Okumura, T. Tashiro, R. Wang, J. Xia, D. Bravo-Berguño, L. Labarga, Ll. Marti, B. Zaldivar, F. d. M. Blaszczyk, E. Kearns, J. D. Gustafson, J. L. Raaf, J. L. Stone, L. Wan, T. Wester, J. Bian, N. J. Griskevich, W. R. Kropp, S. Locke, S. Mine, M. B. Smy, H. W. Sobel, V. Takhistov, P. Weatherly, J. Hill, J. Y. Kim, I. T. Lim, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, A. Coffani, O. Drapier, S. El Hedri, A. Giampaolo, M. Gonin, Th. A. Mueller, P. Paganini, B. Quilain, T. Ishizuka, T. Nakamura, J. S. Jang, J. G. Learned, L. H. V. Anthony, A. A. Sztuc, Y. Uchida, V. Berardi, M. G. Catanesi, E. Radicioni, N. F. Calabria, L. N. Machado, G. De Rosa, G. Collazuol, F. Iacob, M. Lamoureux, N. Ospina, L. Ludovici, Y. Nishimura, S. Cao, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, T. Matsubara, T. Nakadaira, M. Jakkapu, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, Y. Nakano, T. Shiozawa, A. T. Suzuki, Y. Takeuchi, S. Yamamoto, A. Ali, Y. Ashida, J. Feng, S. Hirota, A. K. Ichikawa, T. Kikawa, M. Mori, T. Nakaya, R. A. Wendell, K. Yasutome, P. Fernandez, N. McCauley, P. Mehta, A. Pritchard, K. M. Tsui, Y. Fukuda, Y. Itow, H. Menjo, T. Niwa, K. Sato, M. Tsukada, P. Mijakowski, M. Posiadala-Zezula, C. K. Jung, C. Vilela, M. J. Wilking, C. Yanagisawa, M. Harada, K. Hagiwara, T. Horai, H. Ishino, S. Ito, Y. Koshio, W. Ma, N. Piplani, S. Sakai, Y. Kuno, G. Barr, D. Barrow, L. Cook, A. Goldsack, S. Samani, C. Simpson, D. Wark, F. Nova, T. Boschi, F. Di Lodovico, S. Molina Sedgwick, M. Taani, S. Zsoldos, J. Y. Yang, S. J. Jenkins, J. M. McElwee, M. D. Thiesse, L. F. Thompson, M. Malek, O. Stone, H. Okazawa, S. B. Kim, I. Yu, K. Nishijima, M. Koshiba, N. Ogawa, K. Iwamoto, M. Yokoyama, K. Martens, M. R. Vagins, M. Kuze, S. Izumiyama, M. Tanaka, T. Yoshida, M. Inomoto, M. Ishitsuka, R. Matsumoto, K. Ohta, M. Shinoki, J. F. Martin, H. A. Tanaka, T. Towstego, M. Hartz, A. Konaka, P. de Perio, N. W. Prouse, B. W. Pointon, S. Chen, B. D. Xu, B. Richards, B. Jamieson, J. Walker, A. Minamino, K. Okamoto, G. Pintaudi, R. Sasaki

    Physical Review D   103 ( 1 )   2021.1

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    DOI: 10.1103/physrevd.103.012008

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  • Search for proton decay via p→e+π0 and p→μ+π0 with an enlarged fiducial volume in Super-Kamiokande I-IV

    A. Takenaka, K. Abe, C. Bronner, Y. Hayato, M. Ikeda, S. Imaizumi, H. Ito, J. Kameda, Y. Kataoka, Y. Kato, Y. Kishimoto, Ll. Marti, M. Miura, S. Moriyama, T. Mochizuki, Y. Nagao, M. Nakahata, Y. Nakajima, S. Nakayama, T. Okada, K. Okamoto, A. Orii, G. Pronost, H. Sekiya, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, H. Tanaka, T. Yano, R. Akutsu, S. Han, T. Kajita, K. Okumura, T. Tashiro, R. Wang, J. Xia, D. Bravo-Berguño, L. Labarga, P. Fernandez, B. Zaldivar, F. d. M. Blaszczyk, E. Kearns, J. L. Raaf, J. L. Stone, L. Wan, T. Wester, B. W. Pointon, J. Bian, N. J. Griskevich, W. R. Kropp, S. Locke, S. Mine, M. B. Smy, H. W. Sobel, V. Takhistov, P. Weatherly, K. S. Ganezer, J. Hill, J. Y. Kim, I. T. Lim, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, A. Coffani, O. Drapier, S. El Hedri, A. Giampaolo, M. Gonin, Th. A. Mueller, P. Paganini, B. Quilain, T. Ishizuka, T. Nakamura, J. S. Jang, J. G. Learned, S. Matsuno, L. H. V. Anthony, R. P. Litchfield, A. A. Sztuc, Y. Uchida, V. Berardi, M. G. Catanesi, E. Radicioni, N. F. Calabria, L. N. Machado, G. De Rosa, G. Collazuol, F. Iacob, M. Lamoureux, N. Ospina, L. Ludovici, Y. Nishimura, S. Cao, M. Friend, T. Hasegawa, T. Ishida, M. Jakkapu, T. Kobayashi, T. Matsubara, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, M. Hasegawa, Y. Isobe, H. Miyabe, Y. Nakano, T. Shiozawa, T. Sugimoto, A. T. Suzuki, Y. Takeuchi, S. Yamamoto, A. Ali, Y. Ashida, J. Feng, S. Hirota, A. K. Ichikawa, M. Jiang, T. Kikawa, M. Mori, KE. Nakamura, T. Nakaya, R. A. Wendell, K. Yasutome, N. McCauley, P. Mehta, A. Pritchard, K. M. Tsui, Y. Fukuda, Y. Itow, H. Menjo, T. Niwa, K. Sato, M. Taani, M. Tsukada, P. Mijakowski, K. Frankiewicz, C. K. Jung, G. Santucci, C. Vilela, M. J. Wilking, C. Yanagisawa, D. Fukuda, M. Harada, K. Hagiwara, T. Horai, H. Ishino, S. Ito, Y. Koshio, W. Ma, N. Piplani, S. Sakai, M. Sakuda, Y. Takahira, C. Xu, Y. Kuno, G. Barr, D. Barrow, L. Cook, C. Simpson, D. Wark, F. Nova, T. Boschi, F. Di Lodovico, S. Molina Sedgwick, S. Zsoldos, J. Y. Yang, S. J. Jenkins, J. M. McElwee, M. D. Thiesse, L. F. Thompson, H. Okazawa, Y. Choi, S. B. Kim, I. Yu, K. Nishijima, M. Koshiba, K. Iwamoto, N. Ogawa, M. Yokoyama, A. Goldsack, K. Martens, M. R. Vagins, M. Kuze, M. Tanaka, T. Yoshida, M. Inomoto, M. Ishitsuka, R. Matsumoto, K. Ohta, M. Shinoki, J. F. Martin, C. M. Nantais, H. A. Tanaka, T. Towstego, M. Hartz, A. Konaka, P. de Perio, N. W. Prouse, S. Chen, B. D. Xu, M. Posiadala-Zezula, B. Richards, B. Jamieson, J. Walker, A. Minamino, K. Okamoto, G. Pintaudi, R. Sasaki

    Physical Review D   102 ( 11 )   2020.12

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    DOI: 10.1103/physrevd.102.112011

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  • Indirect search for dark matter from the Galactic Center and halo with the Super-Kamiokande detector

    K. Abe, C. Bronner, Y. Haga, Y. Hayato, M. Ikeda, S. Imaizumi, H. Ito, K. Iyogi, J. Kameda, Y. Kataoka, Y. Kato, Y. Kishimoto, Ll. Marti, M. Miura, S. Moriyama, T. Mochizuki, Y. Nagao, M. Nakahata, Y. Nakajima, T. Nakajima, S. Nakayama, T. Okada, K. Okamoto, A. Orii, G. Pronost, H. Sekiya, M. Shiozawa, Y. Sonoda, A. Takeda, A. Takenaka, H. Tanaka, S. Tasaka, T. Tomura, K. Ueno, T. Yano, T. Yokozawa, R. Akutsu, S. Han, T. Irvine, T. Kajita, I. Kametani, K. P. Lee, T. McLachlan, K. Okumura, E. Richard, T. Tashiro, R. Wang, J. Xia, D. Bravo-Berguño, L. Labarga, P. Fernandez, F. d. M. Blaszczyk, J. Gustafson, C. Kachulis, E. Kearns, J. L. Raaf, J. L. Stone, L. R. Sulak, S. Sussman, L. Wan, T. Wester, S. Berkman, S. Tobayama, J. Bian, G. Carminati, M. Elnimr, N. J. Griskevich, W. R. Kropp, S. Locke, S. Mine, A. Renshaw, M. B. Smy, H. W. Sobel, V. Takhistov, P. Weatherly, B. L. Hartfiel, J. Hill, W. E. Keig, N. Hong, J. Y. Kim, I. T. Lim, R. G. Park, T. Akiri, B. Bodur, A. Himmel, Z. Li, E. O’Sullivan, K. Scholberg, C. W. Walter, T. Wongjirad, A. Coffani, O. Drapier, S. El Hedri, A. Giampaolo, M. Gonin, J. Imber, Th. A. Mueller, P. Paganini, B. Quilain, T. Ishizuka, T. Nakamura, J. S. Jang, K. Choi, J. G. Learned, S. Matsuno, S. N. Smith, J. Amey, L. H. V. Anthony, R. P. Litchfield, W. Y. Ma, A. A. Sztuc, Y. Uchida, M. O. Wascko, V. Berardi, M. G. Catanesi, R. A. Intonti, E. Radicioni, N. F. Calabria, L. N. Machado, G. De Rosa, G. Collazuol, F. Iacob, M. Lamoureux, N. Ospina, L. Ludovici, T. Boschi, F. Di Lodovico, S. Molina Sedgwick, S. Zsoldos, Y. Nishimura, S. Cao, M. Friend, T. Hasegawa, T. Ishida, T. Ishii, T. Kobayashi, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, KE. Abe, M. Hasegawa, Y. Isobe, H. Miyabe, Y. Nakano, T. Shiozawa, T. Sugimoto, A. T. Suzuki, Y. Takeuchi, S. Yamamoto, A. Ali, Y. Ashida, T. Hayashino, T. Hiraki, S. Hirota, K. Huang, K. Ieki, M. Jiang, T. Kikawa, M. Mori, A. Murakami, KE. Nakamura, T. Nakaya, N. D. Patel, K. Suzuki, S. Takahashi, K. Tateishi, R. A. Wendell, N. McCauley, P. Mehta, A. Pritchard, K. M. Tsui, Y. Fukuda, Y. Itow, H. Menjo, G. Mitsuka, M. Murase, F. Muto, T. Niwa, K. Sato, T. Suzuki, M. Taani, M. Tsukada, P. Mijakowski, K. Frankiewicz, J. Hignight, C. K. Jung, X. Li, J. L. Palomino, G. Santucci, C. Vilela, M. J. Wilking, C. Yanagisawa, D. Fukuda, K. Hagiwara, M. Harada, T. Horai, H. Ishino, S. Ito, T. Kayano, A. Kibayashi, Y. Koshio, W. Ma, T. Mori, H. Nagata, N. Piplani, M. Sakuda, S. Seiya, Y. Takahira, C. Xu, R. Yamaguchi, Y. Kuno, G. Barr, D. Barrow, L. Cook, C. Simpson, D. Wark, F. Nova, R. Tacik, J. Y. Yang, A. Cole, S. J. Jenkins, J. McElwee, M. Thiesse, L. Thompson, H. Okazawa, S. B. Kim, Y. Choi, K. Ito, K. Nishijima, K. Iwamoto, M. Koshiba, Y. Suda, M. Yokoyama, R. G. Calland, A. Goldsack, K. Martens, M. Murdoch, Y. Suzuki, M. R. Vagins, D. Hamabe, M. Kuze, Y. Okajima, M. Tanaka, T. Yoshida, M. Inomoto, M. Ishitsuka, R. Matsumoto, K. Ohta, M. Shinoki, J. F. Martin, C. M. Nantais, H. A. Tanaka, T. Towstego, M. Hartz, A. Konaka, P. de Perio, N. W. Prouse, S. Chen, B. D. Xu, Y. Zhang, B. Richards, K. Connolly, R. J. Wilkes, B. Jamieson, J. Walker, P. Giorgio, A. Minamino, K. Okamoto, G. Pintaudi

    Physical Review D   102 ( 7 )   2020.10

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    DOI: 10.1103/physrevd.102.072002

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  • Classification of Super-Kamiokande atmospheric neutrino events by using neural network

    Ryo Matsumoto, Masaki Ishitsuka

    Journal of Physics: Conference Series   1468 ( 1 )   012161 - 012161   2020.2

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    Publishing type:Research paper (scientific journal)   Publisher:IOP Publishing  

    Abstract

    We present a new event classification method based on neural network for multi-GeV multi-ring samples from Super-Kamiokande (SK) atmospheric neutrino observation. Identifications of neutrino flavors are more difficult for multi-ring events due to several hadrons generated in deep inelastic scattering. We employed neural network to optimize the classification from a combination of observed variables. Compared with the conventional method, significant improvements of the ve selection efficiency is confirmed with the comparable misidentification probabilities. Sensitivity to neutrino mass hierarchy can be improved with more statistics of ve samples.

    DOI: 10.1088/1742-6596/1468/1/012161

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  • Search for Astronomical Neutrinos from Blazar TXS 0506+056 in Super-Kamiokande

    K. Hagiwara, K. Abe, C. Bronner, Y. Hayato, M. Ikeda, H. Ito, J. Kameda, Y. Kataoka, Y. Kato, Y. Kishimoto, Ll. Marti, M. Miura, S. Moriyama, T. Mochizuki, M. Nakahata, Y. Nakajima, S. Nakayama, T. Okada, K. Okamoto, A. Orii, G. Pronost, H. Sekiya, M. Shiozawa, Y. Sonoda, A. Takeda, A. Takenaka, H. Tanaka, T. Yano, R. Akutsu, T. Kajita, K. Okumura, R. Wang, J. Xia, D. Bravo-Berguño, L. Labarga, P. Fernandez, F. D. M. Blaszczyk, E. Kearns, J. L. Raaf, J. L. Stone, L. Wan, T. Wester, J. Bian, N. J. Griskevich, W. R. Kropp, S. Locke, S. Mine, M. B. Smy, H. W. Sobel, V. Takhistov, P. Weatherly, K. S. Ganezer, J. Hill, J. Y. Kim, I. T. Lim, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, A. Coffani, O. Drapier, M. Gonin, Th. A. Mueller, P. Paganini, T. Ishizuka, T. Nakamura, J. S. Jang, J. G. Learned, S. Matsuno, R. P. Litchfield, A. A. Sztuc, Y. Uchida, V. Berardi, N. F. Calabria, M. G. Catanesi, E. Radicioni, G. De Rosa, G. Collazuol, F. Iacob, L. Ludovici, Y. Nishimura, S. Cao, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, M. Hasegawa, Y. Isobe, H. Miyabe, Y. Nakano, T. Shiozawa, T. Sugimoto, A. T. Suzuki, Y. Takeuchi, A. Ali, Y. Ashida, S. Hirota, M. Jiang, T. Kikawa, M. Mori, KE. Nakamura, T. Nakaya, R. A. Wendell, L. H. V. Anthony, N. McCauley, A. Pritchard, K. M. Tsui, Y. Fukuda, Y. Itow, T. Niwa, M. Taani, M. Tsukada, P. Mijakowski, K. Frankiewicz, C. K. Jung, C. Vilela, M. J. Wilking, C. Yanagisawa, D. Fukuda, M. Harada, T. Horai, H. Ishino, S. Ito, Y. Koshio, M. Sakuda, Y. Takahira, C. Xu, Y. Kuno, L. Cook, C. Simpson, D. Wark, F. Di Lodovico, S. Molina Sedgwick, B. Richards, S. Zsoldos, S. B. Kim, M. Thiesse, L. Thompson, H. Okazawa, Y. Choi, K. Nishijima, M. Koshiba, M. Yokoyama, A. Goldsack, K. Martens, B. Quilain, Y. Suzuki, M. R. Vagins, M. Kuze, M. Tanaka, T. Yoshida, M. Ishitsuka, R. Matsumoto, K. Ohta, J. F. Martin, C. M. Nantais, H. A. Tanaka, T. Towstego, M. Hartz, A. Konaka, P. de Perio, S. Chen, B. Jamieson, J. Walker, A. Minamino, K. Okamoto, G. Pintaudi

    The Astrophysical Journal Letters   887 ( 1 )   L6 - L6   2019.12

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    Publishing type:Research paper (scientific journal)   Publisher:American Astronomical Society  

    Abstract

    We report a search for astronomical neutrinos in the energy region from several GeV to TeV in the direction of the blazar TXS 0506+056 using the Super-Kamiokande detector following the detection of a 100 TeV neutrinos from the same location by the IceCube collaboration. Using Super-Kamiokande neutrino data across several data samples observed from 1996 April to 2018 February we have searched for both a total excess above known backgrounds across the entire period as well as localized excesses on smaller timescales in that interval. No significant excess nor significant variation in the observed event rate are found in the blazar direction. Upper limits are placed on the electron- and muon-neutrino fluxes at the 90% confidence level as 6.0 × 10−7 and 4.5 × 10−7–9.3 × 10−10 [erg cm−2 s−1], respectively.

    DOI: 10.3847/2041-8213/ab5863

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    Other Link: https://iopscience.iop.org/article/10.3847/2041-8213/ab5863

  • Sensitivity of Super-Kamiokande with Gadolinium to Low Energy Antineutrinos from Pre-supernova Emission

    C. Simpson, K. Abe, C. Bronner, Y. Hayato, M. Ikeda, H. Ito, K. Iyogi, J. Kameda, Y. Kataoka, Y. Kato, Y. Kishimoto, Ll. Marti, M. Miura, S. Moriyama, T. Mochizuki, M. Nakahata, Y. Nakajima, S. Nakayama, T. Okada, K. Okamoto, A. Orii, G. Pronost, H. Sekiya, M. Shiozawa, Y. Sonoda, A. Takeda, A. Takenaka, H. Tanaka, T. Yano, R. Akutsu, T. Kajita, K. Okumura, R. Wang, J. Xia, D. Bravo-Berguño, L. Labarga, P. Fernandez, F. d. M. Blaszczyk, C. Kachulis, E. Kearns, J. L. Raaf, J. L. Stone, L. Wan, T. Wester, S. Sussman, S. Berkman, J. Bian, N. J. Griskevich, W. R. Kropp, S. Locke, S. Mine, M. B. Smy, H. W. Sobel, V. Takhistov, P. Weatherly, K. S. Ganezer, J. Hill, J. Y. Kim, I. T. Lim, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, A. Coffani, O. Drapier, M. Gonin, J. Imber, Th. A. Mueller, P. Paganini, T. Ishizuka, T. Nakamura, J. S. Jang, K. Choi, J. G. Learned, S. Matsuno, R. P. Litchfield, A. A. Sztuc, Y. Uchida, M. O. Wascko, V. Berardi, N. F. Calabria, M. G. Catanesi, R. A. Intonti, E. Radicioni, G. De Rosa, G. Collazuol, F. Iacob, L. Ludovici, Y. Nishimura, S. Cao, M. Friend, T. Hasegawa, T. Ishida, T. Kobayashi, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, KE. Abe, M. Hasegawa, Y. Isobe, H. Miyabe, Y. Nakano, T. Shiozawa, T. Sugimoto, A. T. Suzuki, Y. Takeuchi, A. Ali, Y. Ashida, T. Hayashino, S. Hirota, M. Jiang, T. Kikawa, M. Mori, KE. Nakamura, T. Nakaya, R. A. Wendell, L. H. V. Anthony, N. McCauley, A. Pritchard, K. M. Tsui, Y. Fukuda, Y. Itow, M. Murrase, T. Niwa, M. Taani, M. Tsukada, P. Mijakowski, K. Frankiewicz, C. K. Jung, X. Li, J. L. Palomino, G. Santucci, C. Vilela, M. J. Wilking, C. Yanagisawa, D. Fukuda, M. Harada, K. Hagiwara, T. Horai, H. Ishino, S. Ito, Y. Koshio, M. Sakuda, Y. Takahira, C. Xu, Y. Kuno, L. Cook, D. Wark, F. Di Lodovico, S. Molina Sedgwick, B. Richards, S. Zsoldos, S. B. Kim, R. Tacik, M. Thiesse, L. Thompson, H. Okazawa, Y. Choi, K. Nishijima, M. Koshiba, M. Yokoyama, A. Goldsack, K. Martens, M. Murdoch, B. Quilain, Y. Suzuki, M. R. Vagins, M. Kuze, Y. Okajima, M. Tanaka, T. Yoshida, M. Ishitsuka, R. Matsumoto, K. Ohta, J. F. Martin, C. M. Nantais, H. A. Tanaka, T. Towstego, M. Hartz, A. Konaka, P. de Perio, S. Chen, B. Jamieson, J. Walker, A. Minamino, K. Okamoto, G. Pintaudi

    The Astrophysical Journal   885 ( 2 )   133 - 133   2019.11

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    Publishing type:Research paper (scientific journal)   Publisher:American Astronomical Society  

    Abstract

    Supernova detection is a major objective of the Super-Kamiokande (SK) experiment. In the next stage of SK (SK-Gd), gadolinium (Gd) sulfate will be added to the detector, which will improve the ability of the detector to identify neutrons. A core-collapse supernova (CCSN) will be preceded by an increasing flux of neutrinos and antineutrinos, from thermal and weak nuclear processes in the star, over a timescale of hours; some of which may be detected at SK-Gd. This could provide an early warning of an imminent CCSN, hours earlier than the detection of the neutrinos from core collapse. Electron antineutrino detection will rely on inverse beta decay events below the usual analysis energy threshold of SK, so Gd loading is vital to reduce backgrounds while maximizing detection efficiency. Assuming normal neutrino mass ordering, more than 200 events could be detected in the final 12 hr before core collapse for a 15–25 solar mass star at around 200 pc, which is representative of the nearest red supergiant to Earth, α -Ori (Betelgeuse). At a statistical false alarm rate of 1 per century, detection could be up to 10 hr before core collapse, and a pre-supernova star could be detected by SK-Gd up to 600 pc away. A pre-supernova alert could be provided to the astrophysics community following gadolinium loading.

    DOI: 10.3847/1538-4357/ab4883

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    Other Link: https://iopscience.iop.org/article/10.3847/1538-4357/ab4883

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Presentations

  • Physics with Intermediate Water Cherenkov Detector

    Ryo Matsumoto

    6th New Physics Opportunities at Neutrino Facilities Workshop (NPN2026)  2026.5 

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    Presentation type:Symposium, workshop panel (nominated)  

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  • Representation of Cherenkov profile for water Cherenkov detector

    Ryo Matsumoto

    FAIRS Japan 2024  2024.12 

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    Presentation type:Poster presentation  

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  • スーパーカミオカンデ水チェレンコフ検出器によるミューオンと中性K中間子への陽子崩壊探索

    松本 遼

    日本物理学会 2024年春季大会  2024.3 

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    Presentation type:Oral presentation (invited, special)  

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  • 水チェレンコフ検出器における陽子崩壊探索

    松本 遼

    RCNP研究会「原子核によるバリオン数・レプトン数の物理  2023.3 

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    Presentation type:Symposium, workshop panel (nominated)  

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  • Latest result of proton decay into μ +K0 search

    Ryo Matsumoto

    新学術領域「ニュートリノで拓く素粒子と宇宙」研究会 2022  2022.11 

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    Presentation type:Symposium, workshop panel (nominated)  

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  • スーパーカミオカンデ検出器におけるミューオンと中性K中間子への陽子崩壊探索

    松本 遼

    日本物理学会 2022 年秋季大会  2022.9 

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  • Search for proton decay into muon and neutral Kaon in Super-Kamiokande

    Ryo Matsumoto

    NEUTRINO2022  2022.6 

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  • Event classification of atmospheric neutrino by neural network in SK

    松本 遼

    新学術領域「ニュートリノで拓く素粒子と宇宙」研究会 2019  2020.12 

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  • Simulation study for proton decay by p → μ+ + K0 mode in Super Kamiokaonde

    松本 遼

    新学術領域「ニュートリノで拓く素粒子と宇宙」研究会 2020  2020.12 

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  • 深層学習を用いたスーパーカミオカンデ事象選別手法の研究

    松本 遼

    日本物理学会 2019 年秋季大会  2019.9 

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  • Classification of Super-Kamiokande atmospheric neutrino events by using neural network

    Ryo Matsumoto

    Topics in Astroparticle and Underground Physics (TAUP)  2019.9 

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  • 深層学習による大気ニュートリノ事象選別手法の研究

    松本 遼

    第一回ニュートリノ若手研究会「ニュートリノ振動とフレーバー物理」  2019.6 

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  • 機械学習を用いたスーパーカミオカンデ事象選別手法の研究

    松本 遼

    日本物理学会 第 74 回年次大会  2019.3 

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  • 機械学習を用いたスーパーカミオカンデ事象選別手法の研究

    松本 遼

    25th ICEPP Symposium  2019.2 

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Research Projects

  • 重い中性レプトンによる複数の粒子発生点を持つ事象の探索

    Grant number:25K23377  2025.7 - 2027.3

    日本学術振興会  科学研究費助成事業  研究活動スタート支援

    松本 遼

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    Grant amount:\2600000 ( Direct Cost: \2000000 、 Indirect Cost:\600000 )

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  • 超対称大統一模型の予言する中性K中間子への陽子崩壊の探索

    Grant number:22KJ2813  2022.4 - 2023.3

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    松本 遼

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    Grant amount:\1100000 ( Direct Cost: \1100000 )

    未だ観測されていない陽子崩壊事象の観測は、現在の素粒子物理学における標準模型を超えた模型である大統一理論の直接的な証拠となる。本研究では、現在世界最大の水チェレンコフ検出器であるスーパーカミオカンデ検出器において、陽子がミューオンと中性K中間子に崩壊する事象の探索を行った。この崩壊モードは過去にスーパーカミオカンデにおける観測データを用いて探索されたが、統計的に有意な信号事象は観測されず、寿命の下限値に1.6×10^{33}年の制限が課せられていた。本研究では、事象再構成アルゴリズムを改良し、対象とした陽子崩壊事象における特徴の一つである、異なる発生点から発生する粒子に対する再構成精度の向上を実現した。また、実験データをもとにK中間子の散乱断面積のモデルを改良し、結果として系統不確かさを抑えることに成功した。これらの改良に加え、過去の解析の約2倍の観測データを解析することで、測定感度を大幅に向上して探索を行なった。
    探索の結果、最終サンプルに統計的に有意な信号事象は観測されなかったが、許容されるミューオンと中性K中間子への陽子崩壊寿命の下限値に対し、3.6×10^{33}年の制限が与えられた。これは過去の探索結果による寿命の制限値を2倍以上更新する世界で最も厳しい制限である。
    この陽子崩壊探索の結果はスーパーカミオカンデコラボレーションの論文としてPhysical Review D誌より公表した。

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