Author: "M, Koshiba" - Searchworks@Jio Institute Digital Library Search Results

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461 results on '"M, Koshiba"'

1. Search for supernova bursts in Super-Kamiokande IV

Author: 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, 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, G. Pintaudi, R. Sasaki, S. Sano, S. Suzuki, K. Wada, S. Cao, A. ichikawa, K. D. Nakamura, S. Tairafune, K. Choi, Mori, M., Abe, K., Hayato, Y., Hiraide, K., Ieki, K., Ikeda, M., Imaizumi, S., Kameda, J., Kanemura, Y., Kaneshima, R., Kashiwagi, Y., Kataoka, Y., Miki, S., Mine, S., Miura, M., Moriyama, S., Nagao, Y., Nakahata, M., Nakano, Y., Nakayama, S., Noguchi, Y., Okada, T., Okamoto, K., Orii, A., Sato, K., Sekiya, H., Shiba, H., Shimizu, K., Shiozawa, M., Sonoda, Y., Suzuki, Y., Takeda, A., Takemoto, Y., Takenaka, A., Tanaka, H., Tomiya, T., Watanabe, S., Yano, T., Yoshida, S., Han, S., Kajita, T., Okumura, K., Tashiro, T., Wang, X., Xia, J., Megias, G. D., Bravo-Bergu??o, D., Fernandez, P., Labarga, L., Ospina, N., Zaldivar, B., Zsoldos, S., Pointon, B. W., Blaszczyk, F. D. M., Kearns, E., Raaf, J. L., Stone, J. L., Wan, L., Wester, T., Bian, J., Griskevich, N. J., Kropp, W. R., Locke, S., Smy, M. B., Sobel, H. W., Takhistov, V., A., Yankelevich, Hill, J., Kim, J. Y., Lim, I. T., Park, R. G., Bodur, B., Scholberg, K., Walter, C. W., Bernard, L., Coffani, A., Drapier, O., El Hedri, S., Giampaolo, A., Mueller, Th. A., Paganini, P., Quilain, B., Santos, A. D., Ishizuka, T., Nakamura, T., Jang, J. S., Learned, J. G., Anthony, L. H. V., Martin, D., Scott, M., Sztuc, A. A., Uchida, Y., Berardi, V., Catanesi, M. G., Radicioni, E., Calabria, N. F., Nascimento Machado, L., De Rosa, G., Collazuol, G., Iacob, F., Lamoureux, M., Mattiazzi, M., Ludovici, L., Gonin, M., Pronost, G., Maekawa, Y., Nishimura, Y., Fujisawa, C., Friend, M., Hasegawa, T., Ishida, T., Kobayashi, T., Jakkapu, M., Matsubara, T., Nakadaira, T., Nakamura, K., Oyama, Y., Sakashita, K., Sekiguchi, T., Tsukamoto, T., Ozaki, H., Shiozawa, T., Suzuki, A. T., Takeuchi, Y., Yamamoto, S., Kotsar, Y., Ashida, Y., Bronner, C., Feng, J., Hirota, S., Kikawa, T., Nakaya, T., Wendell, R. A., Yasutome, K., Mccauley, N., Mehta, P., Tsui, K. M., Fukuda, Y., Itow, Y., Menjo, H., Ninomiya, K., Niwa, T., Tsukada, M., Lagoda, J., Lakshmi, S. M., Mijakowski, P., Zalipska, J., Mandal, M., Prabhu, Y. S., Jiang, J., Jung, C. K., Vilela, C., Wilking, M. J., Yanagisawa, C., Jia, M., Hagiwara, K., Harada, M., Horai, T., Ishino, H., Ito, S., Kitagawa, H., Koshio, Y., Ma, W., Nakanishi, F., Piplani, N., Sakai, S., Barr, G., Barrow, D., Cook, L., Samani, S., Wark, D., Nova, F., Boschi, T., Gao, J., Goldsack, A., Katori, T., Di Lodovico, F., Migenda, J., Taani, M., Yang, J. Y., Jenkins, S. J., Malek, M., Mcelwee, J. M., Stone, O., Thiesse, M. D., Thompson, L. F., Okazawa, H., Kim, S. B., Seo, J. W., Yu, I., Nishijima, K., Koshiba, M., Nakagiri, K., Nakajima, Y., Iwamoto, K., Taniuchi, N., Yokoyama, M., Martens, K., de Perio, P., Vagins, M. R., Kuze, M., Izumiyama, S., Yoshida, T., Inomoto, M., Ishitsuka, M., Ito, H., Kinoshita, T., Matsumoto, R., Ohta, K., Ommura, Y., Shigeta, N., Shinoki, M., Suganuma, T., Yamauchi, K., Martin, J. F., Tanaka, H. A., Towstego, T., Akutsu, R., Gousy-Leblanc, V., Hartz, M., Konaka, A., Prouse, N. W., Chen, S., Xu, B. D., Zhang, B., Posiadala-Zezula, M., Hadley, D., Nicholson, M., O???flaherty, M., Richards, B., Ali, A., Jamieson, B., Walker, J., Marti, Ll., Minamino, A., Pintaudi, G., Sasaki, R., Sano, S., Suzuki, S., Wada, K., Cao, S., Ichikawa, A., Nakamura, K. D., Tairafune, S., and Choi, K.
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, High Energy Physics - Experiment, Supernova neutrinos, High Energy Physics - Experiment (hep-ex), Space and Planetary Science, Core-collapse supernovae Supernova neutrinos Particle astrophysics, Core-collapse supernovae, Particle astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics::Galaxy Astrophysics
Abstract: 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.
Published: 2022

2. First gadolinium loading to Super-Kamiokande

Author: 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. 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, G. Pintaudi, S. Sano, R. Sasaki, Abe, K., Bronner, C., Hayato, Y., Hiraide, K., Ikeda, M., Imaizumi, S., Kameda, J., Kanemura, Y., Kataoka, Y., Miki, S., Miura, M., Moriyama, S., Nagao, Y., Nakahata, M., Nakayama, S., Okada, T., Okamoto, K., Orii, A., Pronost, G., Sekiya, H., Shiozawa, M., Sonoda, Y., Suzuki, Y., Takeda, A., Takemoto, Y., Takenaka, A., Tanaka, H., Watanabe, S., Yano, T., Han, S., Kajita, T., Okumura, K., Tashiro, T., Xia, J., Megias, G. D., Bravo-Berguno, D., Labarga, L., Marti, L., Zaldivar, B., Pointon, B. W., Blaszczyk, F. D. M., Kearns, E., Raaf, J. L., Stone, J. L., Wan, L., Wester, T., Bian, J., Griskevich, N. J., Kropp, W. R., Locke, S., Mine, S., Smy, M. B., Sobel, H. W., Takhistov, V., Hill, J., Kim, J. Y., Lim, I. T., Park, R. G., Bodur, B., Scholberg, K., Walter, C. W., Bernard, L., Coffani, A., Drapier, O., Hedri, S. E., Giampaolo, A., Gonin, M., Mueller, T. A., Paganini, P., Quilain, B., Ishizuka, T., Nakamura, T., Jang, J. S., Learned, J. G., Anthony, L. H. V., Martin, D., Scott, M., Sztuc, A. A., Uchida, Y., Cao, S., Berardi, V., Catanesi, M. G., Radicioni, E., Calabria, N. F., Nascimento Machado, L., De Rosa, G., Collazuol, G., Iacob, F., Lamoureux, M., Mattiazzi, M., Ospina, N., Ludovici, L., Maekawa, Y., Nishimura, Y., Friend, M., Hasegawa, T., Ishida, T., Kobayashi, T., Jakkapu, M., Matsubara, T., Nakadaira, T., Nakamura, K., Oyama, Y., Sakashita, K., Sekiguchi, T., Tsukamoto, T., Boschi, T., Gao, J., Di Lodovico, F., Migenda, J., Taani, M., Zsoldos, S., Kotsar, Y., Nakano, Y., Ozaki, H., Shiozawa, T., Suzuki, A. T., Takeuchi, Y., Yamamoto, S., Ali, A., Ashida, Y., Feng, J., Hirota, S., Kikawa, T., Mori, M., Nakaya, T., Wendell, R. A., Yasutome, K., Fernandez, P., Mccauley, N., Mehta, P., Tsui, K. M., Fukuda, Y., Itow, Y., Menjo, H., Niwa, T., Sato, K., Tsukada, M., Lagoda, J., Lakshmi, S. M., Mijakowski, P., Zalipska, J., Jiang, J., Jung, C. K., Vilela, C., Wilking, M. J., Yanagisawa, C., Hagiwara, K., Harada, M., Horai, T., Ishino, H., Ito, S., Kitagawa, F., Koshio, Y., Ma, W., Piplani, N., Sakai, S., Barr, G., Barrow, D., Cook, L., Goldsack, A., Samani, S., Wark, D., Nova, F., Yang, J. Y., Jenkins, S. J., Malek, M., Mcelwee, J. M., Stone, O., Thiesse, M. D., Thompson, L. F., Okazawa, H., Kim, S. B., Seo, J. W., Yu, I., Ichikawa, A. K., Nishijima, K., Koshiba, M., Iwamoto, K., Nakajima, Y., Ogawa, N., Yokoyama, M., Martens, K., Vagins, M. R., Kuze, M., Izumiyama, S., Yoshida, T., Inomoto, M., Ishitsuka, M., Ito, H., Kinoshita, T., Matsumoto, R., Ohta, K., Shinoki, M., Suganuma, T., Martin, J. F., Tanaka, H. A., Towstego, T., Akutsu, R., Hartz, M., Konaka, A., de Perio, P., Prouse, N. W., Chen, S., Xu, B. D., Posiadala-Zezula, M., Hadley, D., O'Flaherty, M., Richards, B., Jamieson, B., Walker, J., Minamino, A., Pintaudi, G., Sano, S., and Sasaki, R.
Subjects: Nuclear and High Energy Physics, Gadolinium Neutrino Neutron Water Cherenkov detector, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, FOS: Physical sciences, Gadolinium, Neutron, Instrumentation and Detectors (physics.ins-det), 01 natural sciences, Water Cherenkov detector, 0103 physical sciences, Neutrino, 010306 general physics, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation, Instrumentation and Methods for Astrophysics (astro-ph.IM)
Abstract: In order to improve Super-Kamiokande's neutron detection efficiency and to thereby increase its sensitivity to the diffuse supernova neutrino background flux, 13 tons of $\rm Gd_2(\rm SO_4)_3\cdot \rm 8H_2O$ (gadolinium sulfate octahydrate) was dissolved into the detector's otherwise ultrapure water from July 14 to August 17, 2020, marking the start of the SK-Gd phase of operations. During the loading, water was continuously recirculated at a rate of 60 m$^3$/h, extracting water from the top of the detector and mixing it with concentrated $\rm Gd_2(\rm SO_4)_3\cdot \rm 8H_2O$ solution to create a 0.02% solution of the Gd compound before injecting it into the bottom of the detector. A clear boundary between the Gd-loaded and pure water was maintained through the loading, enabling monitoring of the loading itself and the spatial uniformity of the Gd concentration over the 35 days it took to reach the top of the detector. During the subsequent commissioning the recirculation rate was increased to 120 m$^3$/h, resulting in a constant and uniform distribution of Gd throughout the detector and water transparency equivalent to that of previous pure-water operation periods. Using an Am-Be neutron calibration source the mean neutron capture time was measured to be $115\pm1$ $\mu$s, which corresponds to a Gd concentration of $111\pm2$ ppm, as expected for this level of Gd loading. This paper describes changes made to the water circulation system for this detector upgrade, the Gd loading procedure, detector commissioning, and the first neutron calibration measurements in SK-Gd., Comment: 37 pages, 19 Figures, Accepted for publication in Nucl. Instrum. Meth. A
Published: 2022

3. Neutron tagging following atmospheric neutrino events in a water Cherenkov detector

Author: 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. 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, G. Pintaudi, S. Sano, R. Sasaki, Abe, K., Haga, Y., Hayato, Y., Hiraide, K., Ieki, K., Ikeda, M., Imaizumi, S., Iyogi, K., Kameda, J., Kanemura, Y., Kataoka, Y., Kato, Y., Kishimoto, Y., Miki, S., Mine, S., Miura, M., Mochizuki, T., Moriyama, S., Nagao, Y., Nakahata, M., Nakajima, T., Nakano, Y., Nakayama, S., Okada, T., Okamoto, K., Orii, A., Sato, K., Sekiya, H., Shiozawa, M., Sonoda, Y., Suzuki, Y., Takeda, A., Takemoto, Y., Takenaka, A., Tanaka, H., Tasaka, S., Tomura, T., Ueno, K., Watanabe, S., Yano, T., Yokozawa, T., Han, S., Irvine, T., Kajita, T., Kametani, I., Kaneyuki, K., Lee, K. P., Mclachlan, T., Okumura, K., Richard, E., Tashiro, T., Wang, R., Xia, J., Megias, G. D., Bravo-Bergu??o, D., Labarga, L., Zaldivar, B., Goldhaber, M., Blaszczyk, F. d. M., Gustafson, J., Kachulis, C., Kearns, E., Raaf, J. L., Stone, J. L., Sulak, L. R., Sussman, S., Wan, L., Wester, T., Pointon, B. W., Bian, J., Carminati, G., Elnimr, M., Griskevich, N. J., Kropp, W. R., Locke, S., Renshaw, A., Smy, M. B., Sobel, H. W., Takhistov, V., Weatherly, P., Ganezer, K. S., Hartfiel, B. L., Hill, J., Keig, W. E., Hong, N., Kim, J. Y., Lim, I. T., Park, R. G., Akiri, T., Bodur, B., Himmel, A., Li, Z., O'Sullivan, E., Scholberg, K., Walter, C. W., Wongjirad, T., Bernard, L., Coffani, A., Drapier, O., El Hedri, S., Giampaolo, A., Imber, J., Mueller, Th. A., Paganini, P., Quilain, B., Ishizuka, T., Nakamura, T., Jang, J. S., Choi, K., Learned, J. G., Matsuno, S., Smith, S. N., Amey, J., Anthony, L. H. V., Litchfield, R. P., Ma, W. Y., Marin, D., Sztuc, A. A., Uchida, Y., Wascko, M. O., Berardi, V., Catanesi, M. G., Intonti, R. A., Radicioni, E., Calabria, N. F., De Rosa, G., Nascimento Machado, L., Collazuol, G., Iacob, F., Lamoureux, M., Ospina, N., Ludovici, L., Gonin, M., Pronost, G., Maekawa, Y., Nishimura, Y., Cao, S., Friend, M., Hasegawa, T., Ishida, T., Ishii, T., Jakkapu, M., Kobayashi, T., Matsubara, T., Nakadaira, T., Nakamura, K., Oyama, Y., Sakashita, K., Sekiguchi, T., Tsukamoto, T., Boschi, T., Di Lodovico, F., Migenda, J., Molina Sedgwick, S., Taani, M., Zsoldos, S., Abe, K. E., Hasegawa, M., Isobe, Y., Kotsar, Y., Miyabe, H., Ozaki, H., Shiozawa, T., Sugimoto, T., Suzuki, A. T., Takeuchi, Y., Yamamoto, S., Ali, A., Ashida, Y., Bronner, C., Feng, J., Hayashino, T., Hiraki, T., Hirota, S., Huang, K., Jiang, M., Kikawa, T., Mori, M., Murakami, A., Nakamura, Ke., Nakaya, T., Patel, N. D., Suzuki, K., Takahashi, S., Tateishi, K., Wendell, R. A., Yasutome, K., Fernandez, P., Mccauley, N., Mehta, P., Pritchard, A., Tsui, K. M., Fukuda, Y., Itow, Y., Menjo, H., Mitsuka, G., Murase, M., Muto, F., Niwa, T., Suzuki, T., Tsukada, M., Frankiewicz, K., Mijakowski, P., Hignight, J., Jiang, J., Jung, C. K., Li, X., Palomino, J. L., Santucci, G., Vilela, C., Wilking, M. J., Yanagisawa, C., Fukuda, D., Hagiwara, K., Harada, M., Horai, T., Ishino, H., Ito, S., Kayano, T., Kibayashi, A., Kitagawa, H., Koshio, Y., Ma, W., Mori, T., Nagata, H., Piplani, N., Sakai, S., Sakuda, M., Takahira, Y., Xu, C., Yamaguchi, R., Kuno, Y., Barr, G., Barrow, D., Cook, L., Goldsack, A., Samani, S., Simpson, C., Wark, D., Nova, F., Tacik, R., Yang, J. Y., Cole, A., Jenkins, S. J., Malek, M., Mcelwee, J. M., Stone, O., Thiesse, M. D., Thompson, L. F., Okazawa, H., Choi, Y., Kim, S. B., Yu, I., Ichikawa, A. K., Ito, K., Nishijima, K., Calland, R. G., de Perio, P., Martens, K., Murdoch, M., Vagins, M. R., Koshiba, M., Totsuka, Y., Iwamoto, K., Nakajima, Y., Ogawa, N., Suda, Y., Yokoyama, M., Hamabe, D., Izumiyama, S., Kuze, M., Okajima, Y., Tanaka, M., Yoshida, T., Inomoto, M., Ishitsuka, M., Ito, H., Matsumoto, R., Ohta, K., Shinoki, M., Martin, J. F., Nantais, C. M., Tanaka, H. A., Towstego, T., Akutsu, R., Hartz, M., Konaka, A., Prouse, N. W., Chen, S., Xu, B. D., Zhang, Y., Berkman, S., Tobayama, S., Connolly, K., Wilkes, R. J., Posiadala-Zezula, M., Hadley, D., Richards, B., Jamieson, B., Walker, J., Marti, Ll., Minamino, A., Pintaudi, G., Sano, S., and Sasaki, R.
Subjects: Physics - Instrumentation and Detectors, Large detector systems for particle and astroparticle physics, hep-ex, Cherenkov detectors, FOS: Physical sciences, Acceleratorfysik och instrumentering, Instrumentation and Detectors (physics.ins-det), Accelerator Physics and Instrumentation, High Energy Physics - Experiment, Subatomär fysik, High Energy Physics - Experiment (hep-ex), Particle identification methods, Neutrino detectors, Subatomic Physics, Cherenkov detectors Large detector systems for particle and astroparticle physics Neutrino detectors Particle identification methods, Detectors and Experimental Techniques, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation, Instrumentation and Methods for Astrophysics (astro-ph.IM), physics.ins-det, Mathematical Physics, Particle Physics - Experiment, astro-ph.IM
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. 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 \pm 9 \mu s.
Published: 2022

4. Search for neutrinos in coincidence with gravitational wave events from the LIGO–Virgo O3a observing run with the Super-Kamiokande detector

Author: Y. Kanemura, A. Giampaolo, W. R. Kropp, Y. Hayato, A. A. Sztuc, P. Mehta, Pablo Fernandez, T. Hasegawa, F. Iacob, D. Bravo-Berguño, Y. Kuno, T. Towstego, O. Drapier, H. Ito, Sei-ichiro Watanabe, G.D. Barr, J. Bian, N. Piplani, S. Miki, S. V. Cao, M. R. Vagins, K. Martens, Y. Takemoto, L. F. Thompson, S. Imaizumi, A. Coffani, O. Stone, J. S. Jang, M. Taani, Seiko Hirota, T. Kikawa, M. Gonin, J. Xia, Masahiro Kuze, A. Goldsack, S. Han, M. J. Wilking, R. A. Wendell, M. B. Smy, Junjie Jiang, F. Nova, E. Radicioni, Kimihiro Okumura, B. Zaldivar, J. Y. Kim, S. Izumiyama, A. Orii, S. Mine, L. Cook, J. Migenda, John Hill, A. T. Suzuki, K. Okamoto, T. Horai, R. Sasaki, J. F. Martin, J. Kameda, B. Bodur, Yuichi Oyama, T. Nakadaira, J. McElwee, J. L. Stone, I. T. Lim, F. Di Lodovico, D. L. Wark, Vincenzo Berardi, Y. Maekawa, S. El Hedri, T. Sekiguchi, L. Ludovici, Th. A. Mueller, N. Ospina, K. Ohta, G. De Rosa, Hiromasa Tanaka, V. Takhistov, Hiroaki Menjo, C. Simpson, J. G. Learned, K. M. Tsui, P. Mijakowski, J. Y. Yang, K. Abe, J. L. Raaf, M. Tsukada, M. Thiesse, K. Iwamoto, H. K. Tanaka, Yasunari Suzuki, S. Samani, G. D. Megias, A. Konaka, M. G. Catanesi, N. J. Griskevich, Y. Nishimura, David Hadley, F. d. M. Blaszczyk, M. Inomoto, S. Locke, Masaki Ishitsuka, M. Jakkapu, Yusuke Koshio, S. Sakai, D. Barrow, M. Lamoureux, P. Weatherly, P. de Perio, T. Boschi, T. Niwa, K. Nakamura, T. Yoshida, A. Pritchard, C. K. Jung, R. Matsumoto, M. Hartz, T. Shiozawa, C. Vilela, Ahmed Ali, M. Koshiba, Masato Shiozawa, H. Ozaki, T. Tashiro, S. Moriyama, S. Nakayama, R. Akutsu, L. H. V. Anthony, Hussain Kitagawa, S. J. Jenkins, B. Jamieson, R. G. Park, Song Chen, P. Paganini, M. Miura, Masayuki Nakahata, H. W. Sobel, Yuuki Nakano, Y. Uchida, B. D. Xu, Ll. Marti, Kate Scholberg, K. Hagiwara, Yutaka Nakajima, B. W. Pointon, D. Martin, Manabu Tanaka, K. Sato, G. Pintaudi, H. Okazawa, M. Ikeda, L. Wan, S. Molina Sedgwick, Hirokazu Ishino, Y. Kotsar, N. F. Calabria, Yuto Ashida, C. Yanagisawa, E. Kearns, C. Bronner, Masashi Yokoyama, Intae Yu, K. Yasutome, T. Nakamura, G. Collazuol, J. Walker, L. N. Machado, N. Ogawa, K. Nishijima, T. Wester, L. Bernard, T. Ishizuka, M. Harada, Tsuyoshi Nakaya, Y. Nagao, Atsushi Takeda, A. Minamino, Rongkun Wang, S. B. Kim, M. Shinoki, A. K. Ichikawa, N. McCauley, L. Labarga, T. Kobayashi, M. Malek, N. W. Prouse, B. Richards, T. Matsubara, S. Yamamoto, C. W. Walter, K. Sakashita, J. Feng, M. Posiadala-Zezula, W. Ma, B. Quilain, Hiroyuki Sekiya, Y. Kataoka, Y. Fukuda, Y. Takeuchi, T. Kajita, Takatomi Yano, M. Friend, M. Mori, Y. Sonoda, S. Sano, Yoshitaka Itow, G. Pronost, Shintaro Ito, S. Zsoldos, T. Tsukamoto, T. Okada, T. Ishida, A. Takenaka, UAM. Departamento de Física Teórica, Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Super-Kamiokande, Abe, K., Bronner, C., Hayato, Y., Ikeda, M., Imaizumi, S., Kameda, J., Kanemura, Y., Kataoka, Y., Miki, S., Miura, M., Moriyama, S., Nagao, Y., Nakahata, M., Nakayama, S., Okada, T., Okamoto, K., Orii, A., Pronost, G., Sekiya, H., Shiozawa, M., Sonoda, Y., Suzuki, Y., Takeda, A., Takemoto, Y., Takenaka, A., Tanaka, H., Watanabe, S., Yano, T., Han, S., Kajita, T., Okumura, K., Tashiro, T., Wang, R., Xia, J., Megias, G. D., Bravo-Berguno, D., Labarga, L., Marti, Ll., Zaldivar, B., Pointon, B. W., Blaszczyk, F. D. M., Kearns, E., Raaf, J. L., Stone, J. L., Wan, L., Wester, T., Bian, J., Griskevich, N. J., Kropp, W. R., Locke, S., Mine, S., Smy, M. B., Sobel, H. W., Takhistov, V., Weatherly, P., Hill, J., Kim, J. Y., Lim, I. T., Park, R. G., Bodur, B., Scholberg, K., Walter, C. W., Bernard, L., Coffani, A., Drapier, O., El Hedri, S., Giampaolo, A., Gonin, M., Mueller, Th. A., Paganini, P., Quilain, B., Ishizuka, T., Nakamura, T., Jang, J. S., Learned, J. G., Anthony, L. H. V., Martin, D. G. R., Sztuc, A. A., Uchida, Y., Berardi, V., Catanesi, M. G., Radicioni, E., Calabria, N. F., Nascimento Machado, L., de Rosa, G., Collazuol, G., Iacob, F., Lamoureux, M., Ospina, N., Ludovici, L., Maekawa, Y., Nishimura, Y., Cao, S., Friend, M., Hasegawa, T., Ishida, T., Jakkapu, M., Kobayashi, T., Matsubara, T., Nakadaira, T., Nakamura, K., Oyama, Y., Sakashita, K., Sekiguchi, T., Tsukamoto, T., Kotsar, Y., Nakano, Y., Ozaki, H., Shiozawa, T., Suzuki, A. T., Takeuchi, Y., Yamamoto, S., Ali, A., Ashida, Y., Feng, J., Hirota, S., Kikawa, T., Mori, M., Nakaya, T., Wendell, R. A., Yasutome, K., Fernandez, P., Mccauley, N., Mehta, P., Pritchard, A., Tsui, K. M., Fukuda, Y., Itow, Y., Menjo, H., Niwa, T., Sato, K., Tsukada, M., Mijakowski, P., Jiang, J., Jung, C. K., Vilela, C., Wilking, M. J., Yanagisawa, C., Hagiwara, K., Harada, M., Horai, T., Ishino, H., Ito, S., Koshio, Y., Kitagawa, H., Ma, W., Piplani, N., Sakai, S., Kuno, Y., Barr, G., Barrow, D., Cook, L., Goldsack, A., Samani, S., Simpson, C., Wark, D., Nova, F., Boschi, T., Di Lodovico, F., Migenda, J., Molina Sedgwick, S., Taani, M., Zsoldos, S., Yang, J. Y., Jenkins, S. J., Malek, M., Mcelwee, J. M., Stone, O., Thiesse, M. D., Thompson, L. F., Okazawa, H., Kim, S. B., Yu, I., Nishijima, K., Koshiba, M., Iwamoto, K., Nakajima, Y., Ogawa, N., Yokoyama, M., Martens, K., Vagins, M. R., Izumiyama, S., Kuze, M., Tanaka, M., Yoshida, T., Inomoto, M., Ishitsuka, M., Ito, H., Matsumoto, R., Ohta, K., Shinoki, M., Martin, J. F., Tanaka, H. A., Towstego, T., Akutsu, R., Hartz, M., Konaka, A., de Perio, P., Prouse, N. W., Chen, S., Xu, B. D., Posiadala-Zezula, M., Hadley, D., Richards, B., Jamieson, B., Walker, J., Minamino, A., Pintaudi, G., Sano, S., Sasaki, R., and Ichikawa, A. K.
Subjects: Astrophysics, KAMIOKANDE, Neutrino Astronomy, GeV, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Neutrino astronomy Gravitational wave astronomy High energy astrophysics Black holes Compact objects Neutron stars Transient sources, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], LIGO, 010303 astronomy & astrophysics, QC, QB, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), energy: emission, Black holes, Neutrino, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, High energy astrophysics, High-energy astronomy, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Gravitational-wave astronomy, Neutron stars, neutrino: spectrum, 0103 physical sciences, Instrumentation and Methods for Astrophysics (astro-ph.IM), Compact objects, flavor, 010308 nuclear & particles physics, Gravitational wave, background, gravitational radiation, Física, Astronomy and Astrophysics, trigger, Transient sources, flux, Neutron star, VIRGO, Space and Planetary Science, High Energy Physics::Experiment, Gravitational wave astronomy, Neutrino astronomy, Super-Kamiokande, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], statistical
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 ($0.1-10^5$ 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 $7.8\%$ ($1.4\sigma$). 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., Comment: 16 pages, 5 figures. v2: adding corrections from The Astrophysical Journal review
Published: 2021
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5. Diffuse Supernova Neutrino Background search at Super-Kamiokande with neutron tagging

Author: K. Sakashita, A. T. Suzuki, K. Okamoto, M. Posiadala-Zezula, T. Nakadaira, Takuto Suganuma, David Wark, Y. Kataoka, Y. Takeuchi, S. Sakai, Y. Nishimura, Shintaro Ito, Atsushi Takeda, G.D. Barr, B. Quilain, E. Kearns, T. Yano, Tatsuya Kikawa, L. Marti, Yasuhiro Nakajima, Masashi Yokoyama, Tatsushi Kinoshita, Joanna Zalipska, Y. Nagao, A. Minamino, Henry W. Sobel, Marco Mattiazzi, J. McElwee, J. Y. Kim, M. Shinoki, Kenzo Nakamura, M. Friend, N. W. Prouse, Yoshihiro Suzuki, H. A. Tanaka, C. W. Walter, A. Coffani, T. Ishizuka, N. McCauley, Tsuyoshi Nakaya, O. Stone, M. Malek, S. Miki, Takashi Kobayashi, David Hadley, T. Hasegawa, C. K. Jung, S. Yamamoto, Makoto Miura, Yuichi Oyama, O. Drapier, M. Ikeda, Masato Shiozawa, L. Ludovici, A. Takenaka, Hiroyuki Sekiya, S. Izumiyama, T. Matsubara, N. Piplani, Soo-Bong Kim, J. Y. Yang, Y. Fukuda, L. Wan, A. Ali, J. Feng, T. Tsukamoto, S. Locke, S. Mohan Lakshmi, A. Konaka, Hiroaki Menjo, M. Koshiba, Masahiro Kuze, F. Nova, M. Hartz, Takaaki Kajita, R. G. Park, Yuuki Nakano, Yusuke Koshio, R. Sasaki, D. Barrow, Thomas A. Mueller, T. Ishida, B. W. Pointon, Natalv Ospina, Kate Scholberg, K. Yasutome, John Fraser Martin, James Hill, T. Tashiro, Hirokazu Ishino, S. J. Jenkins, E. Radicioni, Marcus O'Flaherty, T. Nakamura, R. Matsumoto, G. Collazuol, Intae Yu, Mark Scott, N. Ogawa, J. L. Raaf, C. Yanagisawa, Yoshinari Hayato, L. Bernard, K. Martens, M. Jakkapu, S. Mine, K. M. Tsui, A. Goldsack, S. Nakayama, M. Taani, T. Boschi, R. A. Wendell, M. Mori, M. Lamoureux, Y. Sonoda, Hiroshi Ito, S. Sano, K. Nishijima, Yoshitaka Itow, T. Wester, S. Han, G. Pronost, H. Okazawa, M. J. Wilking, D. Martin, K. Sato, A. K. Ichikawa, J. Kameda, F. Iacob, P. Mijakowski, K. Abe, Shuhei Watanabe, B. Bodur, Y. Kanemura, A. Giampaolo, Pablo Fernandez, P. Mehta, T. Towstego, S. Zsoldos, Vincenzo Berardi, S. Cao, William R. Kropp, T. Sekiguchi, S. Chen, G. D. Megias, J. Bian, M. Gonin, J. Xia, Sonia El Hedri, M. Thiesse, K. Iwamoto, C. Bronner, Gianfranca De Rosa, J. S. Jang, H. Ozaki, Hussain Kitagawa, B. Jamieson, Patrick de Perio, Katsuki Hiraide, K. Nakamura, Y. Maekawa, Jeff N. Griskevich, S. Moriyama, G. Pintaudi, Masayuki Nakahata, Y. Uchida, N. F. Calabria, J. G. Learned, H. K. Tanaka, P. Paganini, B. D. Xu, S. Samani, M. G. Catanesi, Lester D.R. Thompson, M. R. Vagins, Y. Kotsar, John Walker, L. Cook, I. T. Lim, L. H. V. Anthony, R. Akutsu, C. Vilela, FD Lodovico, Junjie Jiang, V. Takhistov, Justyna Lagoda, Jingyuan Gao, W. Ma, L. Labarga, B. Richards, Kimihiro Okumura, Yasuhiro Takemoto, Masaki Ishitsuka, M. Inomoto, A. A. Sztuc, M. B. Smy, B. Zaldivar, J. Migenda, L. N. Machado, and M. Harada
Subjects: Physics, Supernova, Neutron, Astrophysics, Neutrino, Super-Kamiokande
Published: 2021
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6. Low energy radioactivity BG model in Super-Kamiokande detector from SK-IV data

Author: S. J. Jenkins, K. Nakamura, M. R. Vagins, M. Taani, J. L. Raaf, John Walker, H. Okazawa, Masaki Ishitsuka, S. Moriyama, A. A. Sztuc, P. Mehta, S. Miki, Masayuki Nakahata, Y. Uchida, I. T. Lim, L. H. V. Anthony, Junjie Jiang, V. Takhistov, Yoshinari Hayato, T. Towstego, M. Jakkapu, J. Y. Kim, Y. Maekawa, Patrick de Perio, Atsushi Takeda, T. Boschi, Yasuhiro Nakajima, J. G. Learned, Shuhei Watanabe, A. K. Ichikawa, T. Yano, Hiroshi Ito, A. T. Suzuki, K. Okamoto, Vincenzo Berardi, J. Kameda, S. Izumiyama, Joanna Zalipska, H. K. Tanaka, L. Cook, A. Coffani, S. Samani, M. G. Catanesi, O. Drapier, M. B. Smy, B. Zaldivar, Y. Takeuchi, J. Migenda, O. Stone, B. Bodur, T. Nakadaira, Takashi Kobayashi, P. Mijakowski, S. Zsoldos, Sonia El Hedri, T. Hasegawa, A. Ali, Katsuki Hiraide, Makoto Miura, K. Nishijima, M. Thiesse, K. Iwamoto, Justyna Lagoda, T. Wester, F. Iacob, Jingyuan Gao, Y. Nagao, A. Minamino, S. Mohan Lakshmi, Lester D.R. Thompson, M. Hartz, L. N. Machado, Kenzo Nakamura, K. Sakashita, W. Ma, T. Matsubara, William R. Kropp, T. Sekiguchi, S. Chen, M. Shinoki, M. Harada, N. McCauley, S. Sakai, M. Posiadala-Zezula, R. Akutsu, Marco Mattiazzi, J. Feng, M. Friend, Yuuki Nakano, K. Abe, Shintaro Ito, M. Malek, N. Piplani, B. W. Pointon, S. Yamamoto, Y. Kanemura, A. Giampaolo, Kate Scholberg, Hiroaki Menjo, N. W. Prouse, C. W. Walter, E. Kearns, David Wark, P. Paganini, Kimihiro Okumura, Takaaki Kajita, C. Vilela, T. Tashiro, FD Lodovico, M. Koshiba, B. D. Xu, Masashi Yokoyama, G.D. Barr, Yasuhiro Takemoto, T. Nakamura, S. Locke, Y. Kataoka, James Hill, M. Inomoto, Intae Yu, R. G. Park, Tatsuya Kikawa, G. D. Megias, Pablo Fernandez, R. Matsumoto, L. Marti, N. Ogawa, G. Pintaudi, David Hadley, Hiroyuki Sekiya, J. S. Jang, Hirokazu Ishino, N. Jeff Griskevich, L. Labarga, Soo-Bong Kim, S. Han, L. Bernard, T. Ishizuka, C. Yanagisawa, Tsuyoshi Nakaya, Y. Fukuda, L. Wan, B. Richards, T. Tsukamoto, K. Yasutome, Marcus O'Flaherty, C. K. Jung, Yuichi Oyama, M. Ikeda, A. Goldsack, N. F. Calabria, S. Nakayama, G. Collazuol, Mark Scott, Masato Shiozawa, R. A. Wendell, L. Ludovici, J. Y. Yang, T. Ishida, K. Martens, S. Mine, K. M. Tsui, Y. Kotsar, Y. Nishimura, Masahiro Kuze, F. Nova, R. Sasaki, A. Konaka, M. Lamoureux, Yusuke Koshio, D. Martin, J. Bian, H. Ozaki, Hussain Kitagawa, B. Jamieson, Natalv Ospina, S. Cao, D. Barrow, John Fraser Martin, A. Takenaka, K. Sato, C. Bronner, M. Gonin, J. Xia, Gianfranca De Rosa, Tatsushi Kinoshita, Yoshihiro Suzuki, Henry W. Sobel, J. McElwee, H. A. Tanaka, E. Radicioni, B. Quilain, M. Mori, Y. Sonoda, S. Sano, Yoshitaka Itow, Takuto Suganuma, G. Pronost, M. J. Wilking, Thomas A. Mueller, Pronost, Guillaume, Abe, Ko, Bronner, Christophe, Hayato, Yoshinari, Hiraide, Katsuki, Ikeda, Motoyasu, Kameda, Jun, Kanemura, Yuki, Kataoka, Yousuku, Miki, Shintaro, Miura, Makoto, Moriyama, Shigetaka, Nagao, Yoshiki, Nakahata, Masayuki, Nakayama, Shoei, Okamoto, Kohei, Sekiya, Hiroyuki, Shiozawa, Masato, Sonoda, Yutaro, Suzuki, Yoichiro, Takeda, Atsushi, Takemoto, Yasuhiro, Takenaka, Akira, Tanaka, Hidekazu, Watanabe, Shuhei, Yano, Takatomi, Han, Seungho, Kajita, Takaaki, Okumura, Kimihiro, Tashiro, Takuya, Xia, Junjie, Megias, Guillermo, Labarga, Lui, Marti, Llui, Zaldivar, Bryan, Pointon, Barry W., Kearns, Edward, Raaf, Jennifer L., Wan, Linyan, Wester, Thoma, Bian, Jianming, Griskevich, N. Jeff, Kropp, William R., Locke, Scott, Mine, Shunichi, Smy, Michael, Sobel, Henry W., Takhistov, Volodymyr, Hill, Jame, Kim, Jae Yool, Lim, In Taek, Park, Ryeong Gyoon, Bodur, Baran, Scholberg, Kate, Walter, Chri, Bernard, Laura, Coffani, Alice, Drapier, Olivier, El Hedri, Sonia, Giampaolo, Alberto, Gonin, Michel, Mueller, Thomas A., Paganini, Pascal, Quilain, Benjamin, Ishizuka, Takeharu, Nakamura, Taku, Jang, Jae Seung, Learned, John G., Cao, Son, Anthony, Lauren H. V., Martin, Daniel, Scott, Mark, Sztuc, Artur A., Uchida, Yoshi, Berardi, Vincenzo, Catanesi, Maria Gabriella, Radicioni, Emilio, Calabria, Nicola F., Machado, Lucas N., De Rosa, Gianfranca, Collazuol, Gianmaria, Iacob, Fabio, Lamoureux, Mathieu, Mattiazzi, Marco, Ospina, Natalv, Ludovici, Lucio, Maekawa, Yuto, Nishimura, Yasuhiro, Friend, Megan, Hasegawa, Takuya, Ishida, Taku, Kobayashi, Takashi, Jakkapu, Mahesh, Matsubara, Tsunayuki, Nakadaira, Takeshi, Nakamura, Kenzo, Oyama, Yuichi, Sakashita, Ken, Sekiguchi, Tetsuro, Tsukamoto, Toshifumi, Boschi, Tommaso, Di Lodovico, Francesca, Gao, Jingyuan, Migenda, Jost, Taani, Mahdi, Zsoldos, Stephane, Nakano, Yuuki, Ozaki, Hironori, Suzuki, Atsumu, Takeuchi, Yasuo, Yamamoto, Shotaro, Kotsar, Yurii, Ali, Ajmi, Feng, Jiahui, Kikawa, Tatsuya, Mori, Masamitsu, Nakaya, Tsuyoshi, Wendell, Roger, Yasutome, Kenji, Fernández, Pablo, Mccauley, Neil, Mehta, Pruthvi, Tsui, Ka Ming, Fukuda, Yoshiyuki, Itow, Yoshitaka, Menjo, Hiroaki, Sato, Kazufumi, Lagoda, Justyna, Lakshmi, S. Mohan, Mijakowski, Piotr, Zalipska, Joanna, Jiang, Junjie, Jung, Chang K., Vilela, Cristovao, Wilking, Michael, Yanagisawa, Chiaki, Harada, Masayuki, Ishino, Hirokazu, Ito, Shintaro, Kitagawa, Hussain, Koshio, Yusuke, Ma, Wenjie, Piplani, Nishtha, Sakai, Seiya, Barr, Gile, Barrow, Danial, Cook, Laurence, Goldsack, Alexander, Samani, Soniya, Wark, David, Nova, Federico, Yang, Jeong Yeol, Jenkins, Sam J., Malek, Matthew, Mcelwee, Jordan, Stone, Owen, Thiesse, Matthew D., Thompson, Lee F., Okazawa, Hiroko, Kim, Soo Bong, Yu, Intae, Ichikawa, Atsuko, Nakamura, Kiseki, Nishijima, Kyoshi, Koshiba, Masatoshi, Iwamoto, Konosuke, Nakajima, Yasuhiro, Ogawa, Natsumi, Yokoyama, Masashi, Martens, Kai, Vagins, Mark, Kuze, Masahiro, Izumiyama, Shota, Inomoto, Michitaka, Ishitsuka, Masaki, Ito, Hiroshi, Kinoshita, Tatsushi, Matsumoto, Ryo, Shinoki, Masataka, Suganuma, Takuto, Martin, John Fraser, Tanaka, Hirohisa, Towstego, Trevor, Akutsu, Ryosuke, de Perio, Patrick, Hartz, Mark, Konaka, Akira, Prouse, Nick, Chen, Shaomin, Xu, Benda D., Posiadala-Zezula, Magdalena, Hadley, David, O'Flaherty, Marcu, Richards, Benjamin, Jamieson, Blair, Walker, John, Minamino, Akihiro, Pintaudi, Ggiorgio, Sano, Shiochi, and Sasaki, Ryota
Subjects: Physics, Physics::Instrumentation and Detectors, Solar neutrino, Physics::Medical Physics, Detector, Water source, chemistry.chemical_element, Radon, Nuclear physics, Low energy, chemistry, High Energy Physics::Experiment, Neutrino, Super-Kamiokande, Solar data
Abstract: The radioactivity background are among the most dangerous background for low energy neutrino analysis in Super-Kamiokande (SK), like the solar neutrino analysis. Among them, the main contribution is coming from $^{222}$Rn, which is spread in the detector's water due to the water source and to the photo multiplier (PMT) emanations. Up to now, its exact distribution in the detector was not known. Using our knowledge of the radon concentration in the detector water, and the SK-IV solar data, we developed a model of the radon distribution in the detector. The uncertainty on the Rn concentration associated with this model was estimated to be $\sim0.1$ mBq/m$^{3}$
Published: 2021
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7. Search for tens of MeV neutrinos associated with gamma-ray bursts in Super-Kamiokande

Author: P. Fernandez, Y. Nishimura, M. Inomoto, J. Bian, P. de Perio, G. Pronost, L. Wan, M. Lamoureux, Shintaro Ito, S. Zsoldos, Y. Takeuchi, K. Martens, J. Xia, Y. Sonoda, O. Drapier, Takatomi Yano, S. El Hedri, T. Shiozawa, Ahmed Ali, Ll. Marti, K. Nakamura, C. Xu, Hiroaki Menjo, C. Bronner, A. Konaka, T. Sekiguchi, K. S. Ganezer, M. Hartz, A. Giampaolo, B. Jamieson, N. F. Calabria, J. G. Learned, Takaaki Kajita, K. Yasutome, S. Nakayama, A. Takenaka, M. Harada, Vincenzo Berardi, William R. Kropp, S. Chen, R. G. Park, L. Ludovici, Kimihiro Okumura, Yasuhiro Takemoto, K. M. Tsui, A. Takeda, Hiromasa Tanaka, C. W. Walter, H. Okazawa, K. Okamoto, Y. Ashida, J. McElwee, S. Izumiyama, D. Barrow, Y. Fukuda, M. Ikeda, R. P. Litchfield, T. Okada, Intae Yu, N. Ogawa, Kate Scholberg, H. Miyabe, G. D. Megias, C. Simpson, Makoto Sakuda, L. Bernard, S. Samani, M. G. Catanesi, J. Y. Yang, Masaki Ishitsuka, M. Thiesse, F. d. M. Blaszczyk, Jl Stone, Yoshitaka Kuno, G. Pintaudi, K. Ohta, Hiroyuki Sekiya, F. Nova, Y. Kato, P. Weatherly, K. Abe, S. Han, T. Sugimoto, Hirokazu Ishino, Masayuki Nakahata, N. McCauley, C. M. Nantais, B. Zaldivar, T. Nakadaira, S. Sakai, E. Kearns, A. Goldsack, Michael B. Smy, M. Jakkapu, R. A. Wendell, Y. Uchida, M. Posiadala-Zezula, Y. Oyama, B. Bodur, C. Vilela, G. De Rosa, K. Sato, G. Collazuol, Luis Labarga, J. Kameda, J. Feng, D. Fukuda, T. Niwa, P. Mijakowski, P. Paganini, B. D. Xu, N. J. Griskevich, P. Mehta, T. Horai, C. K. Jung, Lester D.R. Thompson, Yusuke Koshio, D. Bravo-Berguño, S. Matsuno, T. Tsukamoto, K. Hagiwara, S. Hirota, M. Koshiba, Y. Nakajima, G.D. Barr, Yuuki Nakano, T. Mochizuki, Stephen J. Jenkins, I. T. Lim, T. Ishida, Y. Isobe, L. N. Machado, T. Boschi, John Walker, Th. A. Mueller, Hiroshi Ito, B. W. Pointon, M. Taani, R. Akutsu, A. A. Sztuc, Makoto Hasegawa, L. H. V. Anthony, Tatsuya Kikawa, Volodymyr Takhistov, Yousuke Kataoka, N. W. Prouse, S. V. Cao, A. Pritchard, M. Tsukada, M. Gonin, Yoshihiro Suzuki, Y. Nagao, A. Minamino, M. Shinoki, M. Malek, J. Y. Kim, J. L. Raaf, S. Yamamoto, T. Nakamura, S. Locke, M. Jiang, A. Coffani, Yasuhiro Kishimoto, O. Stone, Takashi Kobayashi, T. Towstego, T. Hasegawa, S. Mine, Takahiko Matsubara, K. Frankiewicz, N. Piplani, A. Orii, Mark R. Vagins, S. B. Kim, A. K. Ichikawa, K. E. Nakamura, S. Molina Sedgwick, B. Richards, Ken Sakashita, W. Ma, R. Matsumoto, B. Quilain, J. F. Martin, M. Friend, Masato Shiozawa, Y. Choi, L. Cook, A. Suzuki, Masashi Yokoyama, T. Ishizuka, Tsuyoshi Nakaya, J. S. Jang, Masahiro Kuze, R. Sasaki, Henry W. Sobel, Kyoshi Nishijima, Natalv Ospina, Shigetaka Moriyama, H. A. Tanaka, S. Imaizumi, K. Iwamoto, T. Tashiro, Manabu Tanaka, Yoshinari Hayato, C. Yanagisawa, T. Wester, Yoshitaka Itow, M. Miura, M. J. Wilking, Takashi Yoshida, F. Iacob, E. Radicioni, John Hill, D. L. Wark, Y. Takahira, R. Wang, M. Mori, F. Di Lodovico, Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Super-Kamiokande, and Super-Kamiokande Collaboration
Subjects: Astrophysics::High Energy Astrophysical Phenomena, General Physics and Astronomy, FOS: Physical sciences, Astrophysics, KAMIOKANDE, gamma ray: burst, 01 natural sciences, Fluence, Coincidence, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Positron, F03 Ultra-high energy phenomena of cosmic rays, neutrino: energy, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010303 astronomy & astrophysics, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), 010308 nuclear & particles physics, background, High Energy Physics::Phenomenology, F22 Neutrinos from supernova remnant and other astronomical objects, network, positron, High Energy Physics::Experiment, C43 Underground experiments, Underground experiments Ultra-high energy phenomena of cosmic rays Neutrinos from supernova remnant and other astronomical objects, Neutrino, Astrophysics - High Energy Astrophysical Phenomena, Super-Kamiokande, Gamma-ray burst, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Energy (signal processing), Bar (unit)
Abstract: A search for neutrinos produced in coincidence with Gamma-Ray Bursts(GRB) was conducted with the Super-Kamiokande (SK) detector. Between December 2008 and March 2017, the Gamma-ray Coordinates Network recorded 2208 GRBs that occurred during normal SK operation. Several time windows around each GRB were used to search for coincident neutrino events. No statistically significant signal in excess of the estimated backgrounds was detected. The $\bar\nu_e$ fluence in the range from 8 MeV to 100 MeV in positron total energy for $\bar\nu_e+p\rightarrow e^{+}+n$ was found to be less than $\rm 5.07\times10^5$ cm$^{-2}$ per GRB in 90\% C.L. Upper bounds on the fluence as a function of neutrino energy were also obtained., Comment: 29 pages, 16 figures, 5 tables, accepted by PTEP
Published: 2021
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8. Follow-up of GWTC-2 gravitational wave events with neutrinos from the Super-Kamiokande detector

Author: Vincenzo Berardi, A. A. Sztuc, M. Thiesse, K. Iwamoto, P. Mehta, M. Koshiba, S. J. Jenkins, M. Taani, R. G. Park, H. Okazawa, Y. Takeuchi, Patrick de Perio, Kimihiro Okumura, K. Martens, S. Han, S. Cao, Thomas A. Mueller, E. Kearns, M. R. Vagins, David Hadley, Henry W. Sobel, Yoshinari Hayato, K. Yasutome, S. Mine, K. M. Tsui, Masashi Yokoyama, T. Towstego, C. Bronner, J. Y. Yang, Yasuhiro Takemoto, O. Drapier, J. McElwee, Gianfranca De Rosa, Makoto Miura, E. Radicioni, M. B. Smy, J. S. Jang, Shuhei Watanabe, A. Konaka, Marco Mattiazzi, David Wark, B. Zaldivar, J. Migenda, M. Lamoureux, T. Ishizuka, M. Friend, S. Zsoldos, B. Bodur, H. A. Tanaka, T. Matsubara, N. W. Prouse, Katsuki Hiraide, Tsuyoshi Nakaya, C. W. Walter, Masaki Ishitsuka, S. Locke, S. Miki, Hirokazu Ishino, J. Feng, Sonia El Hedri, Masahiro Kuze, Yusuke Koshio, John Walker, D. Barrow, S. Mohan Lakshmi, J. L. Raaf, M. Mori, Hiroaki Menjo, Y. Sonoda, F. Nova, S. Sano, R. Sasaki, Marcus O'Flaherty, Takaaki Kajita, Yoshitaka Itow, G. Collazuol, M. Jakkapu, Natalv Ospina, Mark Scott, Y. Nishimura, Hiroyuki Sekiya, Soo-Bong Kim, B. Quilain, James Hill, G. Pronost, M. Inomoto, Y. Fukuda, L. Wan, T. Yano, John Fraser Martin, I. T. Lim, T. Boschi, Y. Maekawa, K. Nakamura, M. J. Wilking, J. Bian, K. Abe, L. Bernard, Y. Nagao, A. Minamino, Tatsushi Kinoshita, S. Izumiyama, C. K. Jung, Hiroshi Ito, N. Jeff Griskevich, P. Paganini, Y. Kanemura, M. Ikeda, A. Giampaolo, Masato Shiozawa, L. Ludovici, B. D. Xu, Yoshihiro Suzuki, S. Moriyama, F. Iacob, M. Shinoki, M. Gonin, J. Xia, L. H. V. Anthony, Masayuki Nakahata, J. G. Learned, R. Matsumoto, Takuto Suganuma, Y. Uchida, A. Ali, Kate Scholberg, Pablo Fernandez, N. McCauley, L. N. Machado, H. K. Tanaka, S. Samani, M. Malek, M. G. Catanesi, Junjie Jiang, William R. Kropp, T. Sekiguchi, M. Harada, S. Chen, Kenzo Nakamura, H. Ozaki, S. Yamamoto, Yuuki Nakano, A. T. Suzuki, K. Okamoto, Hussain Kitagawa, B. Jamieson, G. D. Megias, B. W. Pointon, A. K. Ichikawa, T. Nakadaira, J. Kameda, Lester D.R. Thompson, Yuichi Oyama, V. Takhistov, P. Mijakowski, S. Sakai, T. Hasegawa, Atsushi Takeda, G. Pintaudi, Yasuhiro Nakajima, N. F. Calabria, Joanna Zalipska, K. Sakashita, T. Nakamura, N. Piplani, Intae Yu, N. Ogawa, M. Posiadala-Zezula, C. Yanagisawa, J. Y. Kim, A. Goldsack, S. Nakayama, R. A. Wendell, Y. Kataoka, A. Coffani, O. Stone, Takashi Kobayashi, D. Martin, K. Sato, G.D. Barr, Tatsuya Kikawa, L. Marti, M. Hartz, T. Tashiro, K. Nishijima, T. Wester, Justyna Lagoda, Jingyuan Gao, W. Ma, A. Takenaka, T. Tsukamoto, L. Labarga, T. Ishida, B. Richards, Shintaro Ito, Y. Kotsar, C. Vilela, FD Lodovico, L. Cook, R. Akutsu, Lamoureux, Mathieu, Abe, Ko, Bronner, Christophe, Hayato, Yoshinari, Hiraide, Katsuki, Ikeda, Motoyasu, Kameda, Jun, Kanemura, Yuki, Kataoka, Yousuku, Miki, Shintaro, Miura, Makoto, Moriyama, Shigetaka, Nagao, Yoshiki, Nakahata, Masayuki, Nakayama, Shoei, Okamoto, Kohei, Pronost, Guillaume, Sekiya, Hiroyuki, Shiozawa, Masato, Sonoda, Yutaro, Suzuki, Yoichiro, Takeda, Atsushi, Takemoto, Yasuhiro, Takenaka, Akira, Tanaka, Hidekazu, Watanabe, Shuhei, Yano, Takatomi, Han, Seungho, Kajita, Takaaki, Okumura, Kimihiro, Tashiro, Takuya, Xia, Junjie, Megias, Guillermo, Labarga, Lui, Marti, Llui, Zaldivar, Bryan, Pointon, Barry W., Kearns, Edward, Raaf, Jennifer L., Wan, Linyan, Wester, Thoma, Bian, Jianming, Griskevich, N. Jeff, Kropp, William R., Locke, Scott, Mine, Shunichi, Smy, Michael, Sobel, Henry W., Takhistov, Volodymyr, Hill, Jame, Kim, Jae Yool, Lim, In Taek, Park, Ryeong Gyoon, Bodur, Baran, Scholberg, Kate, Walter, Chri, Bernard, Laura, Coffani, Alice, Drapier, Olivier, El Hedri, Sonia, Giampaolo, Alberto, Gonin, Michel, Mueller, Thomas A., Paganini, Pascal, Quilain, Benjamin, Ishizuka, Takeharu, Nakamura, Taku, Jang, Jae Seung, Learned, John G., Cao, Son, Anthony, Lauren H. V., Martin, Daniel, Scott, Mark, Sztuc, Artur A., Uchida, Yoshi, Berardi, Vincenzo, Catanesi, Maria Gabriella, Radicioni, Emilio, Calabria, Nicola F., Machado, Lucas N., De Rosa, Gianfranca, Collazuol, Gianmaria, Iacob, Fabio, Mattiazzi, Marco, Ospina, Natalv, Ludovici, Lucio, Maekawa, Yuto, Nishimura, Yasuhiro, Friend, Megan, Hasegawa, Takuya, Ishida, Taku, Kobayashi, Takashi, Jakkapu, Mahesh, Matsubara, Tsunayuki, Nakadaira, Takeshi, Nakamura, Kenzo, Oyama, Yuichi, Sakashita, Ken, Sekiguchi, Tetsuro, Tsukamoto, Toshifumi, Boschi, Tommaso, Di Lodovico, Francesca, Gao, Jingyuan, Migenda, Jost, Taani, Mahdi, Zsoldos, Stephane, Nakano, Yuuki, Ozaki, Hironori, Suzuki, Atsumu, Takeuchi, Yasuo, Yamamoto, Shotaro, Kotsar, Yurii, Ali, Ajmi, Feng, Jiahui, Kikawa, Tatsuya, Mori, Masamitsu, Nakaya, Tsuyoshi, Wendell, Roger, Yasutome, Kenji, Fernández, Pablo, Mccauley, Neil, Mehta, Pruthvi, Tsui, Ka Ming, Fukuda, Yoshiyuki, Itow, Yoshitaka, Menjo, Hiroaki, Sato, Kazufumi, Lagoda, Justyna, Lakshmi, S. Mohan, Mijakowski, Piotr, Zalipska, Joanna, Jiang, Junjie, Jung, Chang K., Vilela, Cristovao, Wilking, Michael, Yanagisawa, Chiaki, Harada, Masayuki, Ishino, Hirokazu, Ito, Shintaro, Kitagawa, Hussain, Koshio, Yusuke, Ma, Wenjie, Piplani, Nishtha, Sakai, Seiya, Barr, Gile, Barrow, Danial, Cook, Laurence, Goldsack, Alexander, Samani, Soniya, Wark, David, Nova, Federico, Yang, Jeong Yeol, Jenkins, Sam J., Malek, Matthew, Mcelwee, Jordan, Stone, Owen, Thiesse, Matthew D., Thompson, Lee F., Okazawa, Hiroko, Kim, Soo Bong, Yu, Intae, Ichikawa, Atsuko, Nakamura, Kiseki, Nishijima, Kyoshi, Koshiba, Masatoshi, Iwamoto, Konosuke, Nakajima, Yasuhiro, Ogawa, Natsumi, Yokoyama, Masashi, Martens, Kai, Vagins, Mark, Kuze, Masahiro, Izumiyama, Shota, Inomoto, Michitaka, Ishitsuka, Masaki, Ito, Hiroshi, Kinoshita, Tatsushi, Matsumoto, Ryo, Shinoki, Masataka, Suganuma, Takuto, Martin, John Fraser, Tanaka, Hirohisa, Towstego, Trevor, Akutsu, Ryosuke, de Perio, Patrick, Hartz, Mark, Konaka, Akira, Prouse, Nick, Chen, Shaomin, Xu, Benda D., Posiadala-Zezula, Magdalena, Hadley, David, O'Flaherty, Marcu, Richards, Benjamin, Jamieson, Blair, Walker, John, Minamino, Akihiro, Pintaudi, Ggiorgio, Sano, Shiochi, and Sasaki, Ryota
Subjects: Physics, Particle physics, Gravitational wave, Cherenkov detector, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Detector, Flux, law.invention, law, Time windows, High Energy Physics::Experiment, Total energy, Neutrino, Super-Kamiokande
Abstract: Super-Kamiokande (SK) is a 50-kt water Cherenkov detector, instrumented with $\sim 13$k photo-multipliers and running since 1996. It is sensitive to neutrinos with energies ranging from 4.5 MeV to several TeV. A new framework has been developed for the follow-up of gravitational wave (GW) alerts issued by the LIGO-Virgo collaboration (LVC). Neutrinos are searched for, using a 1000-second time window centered on the alert time and in both SK low-energy and high-energy samples. Such observation can then be used to constrain the neutrino emission from the GW source. The significance of potential signals has been obtained by comparing neutrino direction with the localization of the GW. The computation of limits on incoming neutrino flux and on the total energy emitted in neutrinos by the source has been performed for the different neutrino flavors. The results using the LVC GWTC-2 catalog (covering O3a period) are presented, as well as the outlooks for the future real-time public release of follow-ups for the O4 period (in 2022) and beyond.
Published: 2021

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

Author: J. S. Jang, B. Bodur, Yuji Kishimoto, L. H. V. Anthony, Rongkun Wang, J. L. Raaf, L. Labarga, K. Nakamura, T. Niwa, T. Kobayashi, F. d. M. Blaszczyk, M. Jakkapu, M. Hartz, Y. Nishimura, P. Weatherly, S. Moriyama, Y. Isobe, T. Boschi, Hiroshi Ito, B. Richards, G. Santucci, Masayuki Nakahata, N. Ospina, Y. Uchida, V. Takhistov, C. K. Jung, M. Mori, M. Taani, Y. Sonoda, M. Ikeda, M. Koshiba, P. de Perio, T. Yano, A. T. Suzuki, K. Okamoto, J. F. Martin, Masato Shiozawa, Y. Choi, Yoshitaka Itow, H. Okazawa, G. Pintaudi, E. Radicioni, L. Ludovici, W. R. Kropp, K. Sakashita, Yutaka Nakajima, C. Xu, Hiroaki Menjo, P. Paganini, M. Miura, T. Nakadaira, G. Pronost, F. Iacob, R. G. Park, B. D. Xu, N. F. Calabria, O. Drapier, Makoto Sakuda, Ke. Nakamura, M. Jiang, A. Coffani, M. Posiadala-Zezula, T. Horai, Ko Okumura, H. W. Sobel, S. Matsuno, A. Giampaolo, S. Molina Sedgwick, Yuuki Nakano, T. Mochizuki, T. Tashiro, T. Towstego, S. Imaizumi, K. Hagiwara, H.A. Tanaka, S. Cao, S. Sakai, B. W. Pointon, F. Nova, R. Sasaki, R. Matsumoto, Intae Yu, P. Mehta, Y. Kataoka, D. Fukuda, C. Bronner, M. G. Catanesi, S. Han, Pablo Fernandez, H. Miyabe, M. J. Wilking, Yuichi Oyama, R. P. Litchfield, C. M. Nantais, D. Bravo-Berguño, B. Quilain, J. G. Learned, K. Yasutome, S. Zsoldos, Y. Kuno, Ke. Abe, K. Nishijima, S. Locke, Atsushi Takeda, J. C. Hill, K. Ohta, T. Wester, E. Kearns, Vincenzo Berardi, N. Piplani, G. De Rosa, Masashi Yokoyama, J. L. Stone, David A. Wark, J. Y. Yang, M. Tsukada, Y. Takahira, Masaki Ishitsuka, M. Thiesse, K. Iwamoto, G.D. Barr, A. Konaka, S. J. Jenkins, M. R. Vagins, J. Walker, N. J. Griskevich, A. Ali, Yusuke Koshio, Y. Takemoto, A. Pritchard, W. Y. Ma, D. Barrow, L. F. Thompson, T. Ishizuka, Makoto Hasegawa, Y. Nagao, J. McElwee, A. Minamino, Tsuyoshi Nakaya, B. Jamieson, M. Shinoki, K. Frankiewicz, N. McCauley, S. B. Kim, I. T. Lim, S. Yamamoto, T. Matsubara, J. Y. Kim, A. Orii, S. El Hedri, J. Feng, L. Cook, Y. Takeuchi, T. Kajita, J. Bian, H. K. Tanaka, Seiko Hirota, T. Kikawa, M. Gonin, J. Xia, M. Friend, Masaaki Tanaka, N. W. Prouse, C. W. Walter, T. Sugimoto, Hiroyuki Sekiya, Y. Fukuda, L. Wan, R. Akutsu, Y. Hayato, T. Sekiguchi, Yasunari Suzuki, T. Shiozawa, C. Vilela, Ll. Marti, T. Yoshida, Song Chen, K. S. Ganezer, Yuto Ashida, T. Tsukamoto, T. Okada, T. Nakamura, N. Ogawa, T. Ishida, C. Yanagisawa, A. Goldsack, S. Nakayama, R. A. Wendell, A. Takenaka, K. Sato, A. K. Ichikawa, J. Kameda, Th. A. Mueller, Shintaro Ito, P. Mijakowski, Kalen Martens, Kate Scholberg, S. Mine, K. M. Tsui, Takehisa Hasegawa, M. Lamoureux, Hirokazu Ishino, Chris Simpson, G. Collazuol, F. Di Lodovico, M. Kuze, M. Inomoto, A. A. Sztuc, M. B. Smy, B. Zaldivar, Yuta Kato, L. N. Machado, and M. Harada
Subjects: Physics, 010308 nuclear & particles physics, Proton decay, Detector, 01 natural sciences, Lower limit, Nuclear physics, Volume (thermodynamics), 0103 physical sciences, Pi, Atmospheric neutrino, 010306 general physics, Fiducial marker, Super-Kamiokande
Abstract: We have searched for proton decay via p→e+π0 and p→μ+π0 modes with the enlarged fiducial volume data of Super-Kamiokande from April 1996 to May 2018, which corresponds to 450 kton·years exposure. We have accumulated about 25% more livetime and enlarged the fiducial volume of the Super-Kamiokande detector from 22.5 kton to 27.2 kton for this analysis, so that 144 kton·years of data, including 78 kton·years of additional fiducial volume data, has been newly analyzed. No candidates have been found for p→e+π0 and one candidate remains for p→μ+π0 in the conventional 22.5 kton fiducial volume and it is consistent with the atmospheric neutrino background prediction. We set lower limits on the partial lifetime for each of these modes: τ/B(p→e+π0)>2.4×1034 years and τ/B(p→μ+π0)>1.6×1034 years at 90% confidence level.
Published: 2020
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10. Real-time supernova neutrino burst monitor at Super-Kamiokande

Author: A. T. Suzuki, J. F. Martin, T. Nakadaira, G. Carminati, Makoto Sakuda, K. Iyogi, J. L. Raaf, K. Sakashita, K. Kaneyuki, Takaaki Kajita, T. Sekiguchi, E. Kearns, R. A. Wendell, Masashi Yokoyama, Yasunari Suzuki, Y. Hayato, M. Ikeda, John Hill, S. B. Kim, J. Y. Kim, M. Goldhaber, S. N. Smith, Seiko Hirota, T. Kikawa, C. Yanagisawa, Yejin Zhang, T. Ishizuka, L. Marti, K. Tateishi, Tsuyoshi Nakaya, J. S. Jang, A. Himmel, Song Chen, K. Nishijima, W. R. Kropp, S. Tobayama, Takaaki Mori, Kate Scholberg, W. E. Keig, V. Takhistov, Atsushi Takeda, Shigeki Tasaka, E. Richard, J. L. Stone, L. R. Sulak, K. Ieki, Yusuke Suda, Hirokazu Ishino, K. S. Ganezer, R. J. Wilkes, S. Moriyama, R. Tacik, Masayuki Nakahata, I. Kametani, M. Miura, L. Labarga, T. Kobayashi, K. P. Lee, C. K. Jung, Yoshitaka Itow, J. Imber, Masato Shiozawa, Y. Choi, Koh Ueno, H.A. Tanaka, M. J. Wilking, Yasuhiro Kishimoto, A. Konaka, M. B. Smy, Kimihiro Okumura, T. Tomura, H. Okazawa, Y. Kuno, S. Nakayama, T. Yokozawa, T. Tsukamoto, C. Bronner, T. Akiri, B. L. Hartfiel, S. Mine, S. Berkman, J. G. Learned, J. Gustafson, S. Matsuno, T. McLachlan, Takehisa Hasegawa, J. Kameda, P. Fernandez, K. Connolly, P. Mijakowski, K. Choi, K. Huang, Kazuhiro Suzuki, A. Kibayashi, Y. Koshio, T. Ishida, M. Koshiba, H. K. Tanaka, M. R. Vagins, A. Murakami, A. Minamino, G. Mitsuka, I. T. Lim, P. de Perio, T. Yano, A. L. Renshaw, Kenzo Nakamura, Yuichi Oyama, R. Yamaguchi, K. Abe, Y. Totsuka, Susumu Takahashi, T. Wongjirad, Y. Takeuchi, T. Ishii, K. Martens, Y. Nishimura, C. W. Walter, N. Hong, Joshua Hignight, Hiroyuki Sekiya, Y. Fukuda, Yuuki Nakano, T. J. Irvine, Y. Haga, P. Weatherly, and H. W. Sobel
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, High Energy Physics::Phenomenology, FOS: Physical sciences, Astronomy, Astronomy and Astrophysics, Astrophysics, Solar neutrino problem, 01 natural sciences, Cosmic neutrino background, Astrophysics - Solar and Stellar Astrophysics, Neutrino detector, 0103 physical sciences, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino astronomy, Neutrino, Astrophysics - High Energy Astrophysical Phenomena, Super-Kamiokande, 010303 astronomy & astrophysics, Solar and Stellar Astrophysics (astro-ph.SR)
Abstract: We present a real-time supernova neutrino burst monitor at Super-Kamiokande (SK). Detecting supernova explosions by neutrinos in real time is crucial for giving a clear picture of the explosion mechanism. Since the neutrinos are expected to come earlier than light, a fast broadcasting of the detection may give astronomers a chance to make electromagnetic radiation observations of the explosions right at the onset. The role of the monitor includes a fast announcement of the neutrino burst detection to the world and a determination of the supernova direction. We present the online neutrino burst detection system and studies of the direction determination accuracy based on simulations at SK., 15 pages, 8 figures, accepted for publication in Astroparticle Physics
Published: 2016
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11. Measurement of the neutrino-oxygen neutral-current quasielastic cross section using atmospheric neutrinos at Super-Kamiokande

Author: E. Kearns, Masashi Yokoyama, T. Sugimoto, T. Towstego, T. Ishizuka, Y. Hayato, Tsuyoshi Nakaya, R. Akutsu, L. H. V. Anthony, C. W. Walter, F. Di Lodovico, C. Kachulis, T. Hayashino, C. K. Jung, Y. Kuno, K. Nishijima, A. Konaka, A. Minamino, N. McCauley, C. M. Nantais, Masato Shiozawa, Y. Choi, L. Ludovici, N. J. Griskevich, M. Vagins, M. Kuze, J. L. Raaf, Yusuke Koshio, Atsushi Takeda, T. Sekiguchi, P. de Perio, B. Bodur, V. Takhistov, Hiroyuki Sekiya, S. Molina Sedgwick, Soo-Bong Kim, Y. Fukuda, L. Wan, N. F. Calabria, Ke. Nakamura, Hirokazu Ishino, Y. Isobe, Y. Takeuchi, Lester D.R. Thompson, K. Martens, Y. Nishimura, A. T. Suzuki, K. Okamoto, Hiromasa Tanaka, M. Murdoch, J. Bian, C. Vilela, T. Tsukamoto, T. Okada, C. Xu, A. Pritchard, Makoto Hasegawa, W. R. Kropp, K. Sakashita, J. F. Martin, Takaaki Kajita, Yuichi Oyama, T. Nakadaira, M. Friend, M. Thiesse, G. De Rosa, C. Simpson, J. Imber, K. M. Tsui, Ahmed Ali, M. B. Smy, R. P. Litchfield, Seiko Hirota, Xiao-yan Li, G. Collazuol, Yuta Kato, T. Ishida, Rongkun Wang, T. Kikawa, M. Gonin, J. Xia, H. K. Tanaka, M. G. Catanesi, M. Ikeda, Makoto Sakuda, M. Miura, K. Frankiewicz, Yutaka Nakajima, Ll. Marti, K. Abe, J. L. Stone, Y. Okajima, K. Iyogi, J. Y. Kim, S. Mine, A. Orii, S. Cao, L. Labarga, Yoshihiro Suzuki, R. A. Wendell, M. J. Wilking, S. Berkman, J. L. Palomino, M. Hartz, K. Choi, Pablo Fernandez, C. Bronner, Shintaro Ito, R. A. Intonti, J. G. Learned, I. T. Lim, H. Miyabe, Kate Scholberg, H. Okazawa, S. Locke, S. Matsuno, B. Quilain, A. Takenaka, F. d. M. Blaszczyk, P. Weatherly, B. Richards, M. Koshiba, R. G. Park, Ko Okumura, Ke. Abe, K. Hagiwara, Yuuki Nakano, T. Mochizuki, Sara Sussman, J. Kameda, Th. A. Mueller, P. Mijakowski, Felix Iacob, J. S. Jang, Masaki Ishitsuka, M. O. Wascko, A. Goldsack, S. Nakayama, T. Yoshida, Song Chen, R. Tacik, D. Fukuda, K. S. Ganezer, E. Radicioni, John Hill, D. L. Wark, Y. Takahira, T. Yano, M. Mori, Y. Sonoda, Yoshitaka Itow, G. Pronost, T. Nakamura, M. Murrase, C. Yanagisawa, H. W. Sobel, Y. Ashida, K. Nakamura, S. Moriyama, G. Santucci, Masayuki Nakahata, Y. Uchida, T. Hasegawa, M. Jiang, Yasuhiro Kishimoto, Takashi Kobayashi, Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Super-Kamiokande, Science and Technology Facilities Council (STFC), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), DE ROSA, Gianfranca, and Et, Al
Subjects: Physics::Instrumentation and Detectors, neutrino oxygen neutral current interaction, Flux, KAMIOKANDE, 7. Clean energy, 01 natural sciences, neutrino: flux, High Energy Physics - Experiment, Physics, Particles & Fields, High Energy Physics - Experiment (hep-ex), neutrino: atmosphere, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Particle Physics Experiments, neutrino: supernova, Nuclear Experiment, Physics, neutrino nucleon: inelastic scattering, atmospheric neutrinos, Supernova, Physical Sciences, quasi-elastic cross section, Neutrino, Nucleon, channel cross section: measured, neutrino oxygen neutral current interaction, quasi-elastic cross section, atmospheric neutrinos, SuperKamiokande experiment, neutral current, Cherenkov counter: water, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astronomy & Astrophysics, EVENTS, Nuclear physics, 5/3, neutrino: spectrum, SEARCH, 0103 physical sciences, 010306 general physics, Cherenkov radiation, Science & Technology, Neutral current, background, 010308 nuclear & particles physics, Scattering, scattering, neutrino nucleus: interaction, MU, 13. Climate action, High Energy Physics::Experiment, Super-Kamiokande, oxygen, SuperKamiokande experiment, experimental results
Abstract: Neutral current (NC) interactions of atmospheric neutrinos on oxygen form one of the major backgrounds in the search for supernova relic neutrinos with water-based Cherenkov detectors. The NC channel is dominated by neutrino quasi-elastic (NCQE) scattering off nucleons inside $^{16}$O nuclei. In this paper we report the first measurement of NCQE cross section using atmospheric neutrinos at Super-Kamiokande (SK). The measurement used 2,778 live days of SK-IV data with a fiducial volume of 22.5 kiloton water. Within the visible energy window of 7.5-29.5 MeV, we observed $117$ events compared to the expected $71.9$ NCQE signal and $53.1$ background events. Weighted by the atmospheric neutrino spectrum from 160 MeV to 10 GeV, the flux averaged NCQE cross section is measured to be $(1.01\pm0.17(\text{stat.})^{+0.78}_{-0.30}(\text{sys.}))\times10^{-38}$ cm$^2$., Comment: 11 pages, 9 figures, submitted to PRD
Published: 2019
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12. Results from One Thousand Days of Real-Time, Directional Solar-Neutrino Data

Author: K. S. Hirata, K. Inoue, T. Kajita, T. Kifune, K. Kihara, M. Nakahata, K. Nakamura, S. Ohara, N. Sato, Y. Suzuki, Y. Totsuka, Y. Yaginuma, M. Mori, Y. Oyama, A. Suzuki, K. Takahashi, M. Yamada, M. Koshiba, T. Suda, T. Tajima, K. Miyano, H. Miyata, H. Takei, Y. Fukuda, E. Kodera, Y. Nagashima, M. Takita, K. Kaneyuki, T. Tanimori, E. W. Bcicr, L. R. Feldscher, E. D. Frank, W. Frati, S. B. Kim, A. K. Mann, F. M. Newcomer, R. Van Berg, and W. Zhang
Published: 2018
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13. Supernova Relic Neutrino search with neutron tagging at Super-Kamiokande-IV

Author: Y. Takeuchi, T.S. Tanaka, K. Nishikawa, C. Yanagisawa, A. T. Suzuki, K. Nishijima, L. R. Sulak, Hirokazu Ishino, Takaaki Kajita, J. F. Martin, Yuichi Oyama, R. A. Wendell, T. Nakadaira, P. dePerio, M. B. Smy, H. W. Sobel, Koh Ueno, Atsushi Takeda, A. Konaka, Yusuke Koshio, Makoto Sakuda, Y. Nishimura, Takaaki Mori, Shigeki Tasaka, J. L. Stone, Y. Hayato, S. Nakayama, J. L. Raaf, R. Tacik, R. Yamaguchi, K. Nakamura, I. Taylor, C. K. Jung, G. Carminati, K. Abe, A. Minamino, T. Tomura, A. Murakami, C. W. Walter, T. Yokozawa, H. Okazawa, K. Iyogi, John Hill, S. Moriyama, M. Ikeda, T. Yano, Masato Shiozawa, Y. Choi, Masayuki Nakahata, G. Mitsuka, A. L. Renshaw, T. Tsukamoto, K. Sakashita, K. P. Lee, Joshua Hignight, I. T. Lim, L. Labarga, T. Kobayashi, Hiroyuki Sekiya, K. Choi, Y. Totsuka, Susumu Takahashi, M. J. Wilking, Kimihiro Okumura, Y. Fukuda, K. Kaneyuki, T. Wongjirad, M. Koshiba, T. Ishida, M. Vagins, M. Goldhaber, T. Sekiguchi, W. E. Keig, S. Matsuno, Yejin Zhang, K. Bays, H. Kaji, H. Sui, Song Chen, J. Kameda, Yuuki Nakano, S. N. Smith, Yoshitaka Itow, Yasunari Suzuki, Y. Kuno, P. Mijakowski, H. Kikawa, J. G. Learned, W. R. Kropp, S. Tobayama, Zishuo Yang, Kate Scholberg, M. Dziomba, Kazuhiro Suzuki, H. Zhang, T. McLachlan, Ll. Marti, E. Kearns, S. Barkman, K. Martens, S. Mine, K. S. Ganezer, Masashi Yokoyama, S. B. Kim, J. Y. Kim, K. Huang, A. Kibayashi, K. Ieki, R. J. Wilkes, T. Ishii, T. Ishizuka, Tsuyoshi Nakaya, T. Akiri, T. Hasegawa, Yasuhiro Kishimoto, Y. Takenaga, M. Miura, J. S. Jang, K. Connolly, and J. Imber
Subjects: Physics, Particle physics, Physics - Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Astronomy and Astrophysics, Photon energy, High Energy Physics - Experiment, Nuclear physics, Supernova, Neutron capture, Neutron, High Energy Physics::Experiment, Experimental methods, Neutrino, Super-Kamiokande, Nuclear Experiment, Charged current
Abstract: A search for Supernova Relic Neutrinos $\bar{\nu}_e$'s is first conducted via inverse-beta-decay by tagging neutron capture on hydrogen at Super-Kamiokande-IV. The neutron tagging efficiency is determined to be $(17.74\pm0.04_{stat.}\pm1.05_{sys.})%$, while the corresponding accidental background probability is $(1.06\pm0.01_{stat.}\pm 0.18_{sys.})$%. Using 960 days of data, we obtain 13 inverse-beta-decay candidates in the range of $E_{\bar{\nu}_e}$ between 13.3 MeV and 31.3 MeV. All of the observed candidates are attributed to background. Upper limits at 90% C.L. are calculated in the absence of a signal., Comment: 6 pages, 4 figures
Published: 2015
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14. Search for nucleon decay into charged antilepton plus meson in 0.316 megaton·years exposure of the Super-Kamiokande water Cherenkov detector

Author: A. T. Suzuki, Atsushi Takeda, J. F. Martin, N. D. Patel, Yusuke Suda, C. Vilela, T. Nakadaira, C. Xu, Makoto Sakuda, K. Ito, H. W. Sobel, Y. Takeuchi, T. Kajita, B. Quilain, M. B. Smy, Y. Sonoda, M. Elnimr, K. Sakashita, A. Konaka, Francesco Muto, Xiao-yan Li, T. Hasegawa, A. Cole, J. L. Stone, Y. Okajima, Yusuke Koshio, Ll. Marti, H. K. Tanaka, Kimihiro Okumura, M. Goldhaber, A. Pritchard, Yoshitaka Itow, J. L. Raaf, M. Miura, J. L. Palomino, R. A. Wendell, K. Choi, Pablo Fernandez, L. R. Sulak, C. Kachulis, J. Amey, T. Hayashino, H.A. Tanaka, G. Pronost, M. Friend, S. Cao, N. McCauley, C. M. Nantais, K. Huang, Z. Li, Song Chen, Makoto Hasegawa, C. W. Walter, Shintaro Ito, A. Kibayashi, C Shimpson, C. Bronner, Shigeki Tasaka, Lester D.R. Thompson, S. Tobayama, J. G. Learned, D. L. Wark, Takahiro Hiraki, M. Koshiba, S. N. Smith, Y. M. Zhang, J. S. Jang, R. G. Park, T. Tomura, K. S. Ganezer, S. Nakayama, Hiroyuki Sekiya, H. Nagata, A. Takenaka, F. d. M. Blaszczyk, H. Okazawa, M. J. Wilking, Soo-Bong Kim, Y. Fukuda, I. T. Lim, Takhistov, Yuichi Oyama, L. Wan, L. Labarga, M. Jiang, T. Nakamura, R. P. Litchfield, Ke. Abe, Takashi Kobayashi, T. Tsukamoto, C. Yanagisawa, S. Berkman, P. Weatherly, J. Kameda, A. Minamino, K. Abe, Yuji Kishimoto, S. Matsuno, Lhv Anthony, T. Ishida, P. Mijakowski, Kalen Martens, T. Yano, B. Richards, R. Akutsu, Ke. Nakamura, M. O. Wascko, R. Tacik, D. Fukuda, K. Kaneyuki, Yuuki Nakano, Y. Nishimura, Yoshihiro Suzuki, Y. Totsuka, Jy Kim, A. Himmel, R. G. Calland, K. Nishijima, T. Sekiguchi, Erin O'Sullivan, F. Di Lodovico, Y. Kuno, Yuta Kato, C. K. Jung, T. Ishii, M. Ikeda, Masato Shiozawa, Y. Choi, Y. Hayato, S. Locke, J. C. Hill, E. Kearns, Seiko Hirota, Masashi Yokoyama, T. Ishizuka, Tsuyoshi Nakaya, M. Hartz, K. Iyogi, W. Y. Ma, R. J. Wilkes, Hirokazu Ishino, Vagins, S. Mine, K. M. Tsui, J. Gustafson, Kate Scholberg, W. R. Kropp, K. Nakamura, K. Frankiewicz, A. Orii, S. Moriyama, G. Santucci, Masayuki Nakahata, Y. Uchida, and M. Murase
Subjects: Physics, Particle physics, Proton, Meson, 010308 nuclear & particles physics, Cherenkov detector, Nuclear Theory, 01 natural sciences, law.invention, Nuclear physics, Pion, law, 0103 physical sciences, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics, Nucleon, Super-Kamiokande, Lepton
Abstract: We have searched for proton decays into a charged antilepton (e+, μ+) plus a meson (η, ρ0, ω) and for neutron decays into a charged antilepton (e+, μ+) plus a meson (π−, ρ−) using Super-Kamiokande I-IV data, corresponding to 0.316 megaton⋅years of exposure. This measurement updates the previous published result by using 2.26 times more data and improved analysis methods. No significant evidence for nucleon decay is observed and lower limits on the partial lifetime of the nucleon are obtained. The limits range from 3×1031 to 1×1034 years at 90% confidence level, depending on the decay mode.
Published: 2017
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15. Search for proton decay via p→e+π0 and p→μ+π0 in 0.31 megaton·years exposure of the Super-Kamiokande water Cherenkov detector

Author: M. J. Wilking, H. W. Sobel, Y. Takeuchi, Y. Totsuka, T. Wongjirad, T. Kajita, Tomohiko Nakajima, Yuichi Oyama, Seiko Hirota, T. Kikawa, T. Ishii, A. T. Suzuki, J. C. Hill, J. F. Martin, T. Nakadaira, M. Friend, Makoto Sakuda, Y. Nishimura, N. Hong, C. W. Walter, Joshua Hignight, Kate Scholberg, T. Sekiguchi, Erin O'Sullivan, S. N. Smith, W. R. Kropp, S. Tobayama, C. Kachulis, Atsushi Takeda, T. Tsukamoto, Shigeki Tasaka, J. Kameda, Yasunari Suzuki, J. S. Jang, J. L. Palomino, M. Koshiba, Hiroyuki Sekiya, P. Mijakowski, Kalen Martens, Y. Fukuda, Hiromasa Tanaka, R. G. Park, M. R. Vagins, Ko Okumura, K. Iyogi, Y. M. Zhang, T. Yano, V. Takhistov, S. Mine, T. J. Irvine, T. Ishida, Kazuhiro Suzuki, J. Gustafson, Takaaki Mori, Ke. Abe, P. Weatherly, Song Chen, J. L. Stone, Takehisa Hasegawa, S. Berkman, J. L. Raaf, Z. Li, K. Sakashita, A. Minamino, Y. Hayato, T. Suzuki, S. Nakayama, R. A. Wendell, Hirokazu Ishino, Yuji Kishimoto, I. T. Lim, K. Choi, K. Nakamura, Pablo Fernandez, Y. Kuno, M. Goldhaber, C. M. Nantais, R. Tacik, D. Fukuda, K. Kaneyuki, S. Moriyama, Yoshitaka Itow, T. Tomura, M. Miura, K. Huang, A. Kibayashi, Masayuki Nakahata, L. Labarga, H. Okazawa, H.A. Tanaka, T. Kobayashi, K. S. Ganezer, S. Cao, C. Bronner, J. G. Learned, S. Matsuno, C. Yanagisawa, E. Richard, Y. Haga, Yuuki Nakano, M. Hartz, R. J. Wilkes, K. Nishijima, Brandon L. Hartfiel, K. Frankiewicz, S. B. Kim, J. Y. Kim, A. Orii, C. Xu, A. Himmel, E. Kearns, A. Konaka, Masashi Yokoyama, Yusuke Koshio, T. Ishizuka, Tsuyoshi Nakaya, C. K. Jung, M. Ikeda, Masato Shiozawa, Y. Choi, Takahiro Hiraki, T. Kayano, Yusuke Suda, J. Imber, L. R. Sulak, Xiao-yan Li, Ll. Marti, M. B. Smy, and R. Akutsu
Subjects: Physics, Particle physics, Proton, 010308 nuclear & particles physics, Cherenkov detector, Proton decay, Hydrogen atom, Expected value, 7. Clean energy, 01 natural sciences, law.invention, Nuclear physics, 13. Climate action, law, 0103 physical sciences, Neutron, Neutrino, 010306 general physics, Super-Kamiokande
Abstract: We have searched for proton decay via p→e+π0 and p→μ+π0 using Super-Kamiokande data from April 1996 to March 2015, 0.306 megaton·years exposure in total. The atmospheric neutrino background rate in Super-Kamiokande IV is reduced to almost half that of phase I-III by tagging neutrons associated with neutrino interactions. The reach of the proton lifetime is further enhanced by introducing new signal criteria that select the decay of a proton in a hydrogen atom. No candidates were seen in the p→e+π0 search. Two candidates that passed all of the selection criteria for p→μ+π0 have been observed, but these are consistent with the expected number of background events of 0.87. Lower limits on the proton lifetime are set at τ/B(p→e+π0)>1.6×1034 years and τ/B(p→μ+π0)>7.7×1033 years at 90% confidence level.
Published: 2017
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16. Search for Boosted Dark Matter Interacting With Electrons in Super-Kamiokande

Author: L. H. V. Anthony, Makoto Hasegawa, C. Xu, Takahiro Hiraki, Takaaki Kajita, S. Berkman, Y. Nishimura, K. Iyogi, W. Y. Ma, Y. Takeuchi, J. S. Jang, R. A. Wendell, Y. Sonoda, Seiko Hirota, Masahiro Kuze, A. Himmel, R. G. Calland, S. N. Smith, Yuichi Oyama, Atsushi Takeda, Song Chen, K. E. Nakamura, A. T. Suzuki, K. S. Ganezer, L. Labarga, R. P. Litchfield, V. Takhistov, Yoshihiro Suzuki, T. Kobayashi, M. R. Vagins, M. Ikeda, J. F. Martin, T. Nakadaira, Yoshitaka Itow, K. Nakamura, T. Ishii, M. Friend, C. Simpson, C. Bronner, Makoto Sakuda, K. Ito, J. L. Stone, G. Pronost, Shigeki Tasaka, W. R. Kropp, C. W. Walter, A. Pritchard, Y. Totsuka, C. Yanagisawa, K. Abe, S. Moriyama, Yusuke Suda, C. Vilela, C. Kachulis, T. Tsukamoto, E. Kearns, S. V. Cao, G. Santucci, Takashi Yoshida, Masayuki Nakahata, A. Cole, T. Nakamura, M. Elnimr, Y. Hayato, Francesco Muto, Y. Uchida, K. Sakashita, Masashi Yokoyama, M. Miura, J. L. Palomino, K. Nishijima, K. Frankiewicz, Hiroyuki Sekiya, T. Tomura, S. Locke, Soo-Bong Kim, M. B. Smy, N. D. Patel, Y. Fukuda, Yoshitaka Kuno, L. Wan, T. Ishizuka, H. Okazawa, Xiao-yan Li, J. Y. Kim, K. Kaneyuki, M. Goldhaber, Tsuyoshi Nakaya, J. Kameda, Ll. Marti, A. Orii, M. Koshiba, C. K. Jung, M. Hartz, J. Amey, H. A. Tanaka, M. Jiang, T. Sekiguchi, Erin O'Sullivan, S. Matsuno, M. Murase, Masato Shiozawa, Y. Choi, K. Choi, R. G. Park, John Hill, Yasuhiro Kishimoto, P. Mijakowski, M. J. Wilking, D. L. Wark, I. T. Lim, H. W. Sobel, R. J. Wilkes, D. Hamabe, T. Hayashino, A. Konaka, T. Hasegawa, Yusuke Koshio, Z. Li, R. Akutsu, Masaki Ishitsuka, B. Quilain, T. Ishida, Ke. Abe, M. O. Wascko, Y. Okajima, H. Nagata, Pablo Fernandez, J. G. Learned, A. Minamino, H. K. Tanaka, T. Yano, Kimihiro Okumura, N. McCauley, C. M. Nantais, J. L. Raaf, K. Martens, K. Huang, A. Kibayashi, S. Mine, K. M. Tsui, J. Gustafson, Lester D.R. Thompson, Shintaro Ito, Yuuki Nakano, F. d. M. Blaszczyk, P. Weatherly, B. Richards, S. Tobayama, Y. M. Zhang, S. Nakayama, A. Takenaka, Hirokazu Ishino, Kate Scholberg, R. Tacik, D. Fukuda, F. Di Lodovico, L. R. Sulak, Yuta Kato, and Science and Technology Facilities Council (STFC)
Subjects: General Physics, Cold dark matter, Dark matter, Physics, Multidisciplinary, General Physics and Astronomy, FOS: Physical sciences, Astrophysics, Electron, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, 010306 general physics, Super-Kamiokande Collaboration, Physics, Annihilation, Science & Technology, 02 Physical Sciences, 010308 nuclear & particles physics, hep-ex, Galactic Center, CONSTRAINTS, hep-ph, Galaxy, GALAXIES, High Energy Physics - Phenomenology, Neutrino detector, 13. Climate action, Physical Sciences, High Energy Physics::Experiment, Super-Kamiokande
Abstract: A search for boosted dark matter using 161.9 kt yr of Super-Kamiokande IV data is presented. We search for an excess of elastically scattered electrons above the atmospheric neutrino background, with a visible energy between 100 MeV and 1 TeV, pointing back to the Galactic center or the Sun. No such excess is observed. Limits on boosted dark matter event rates in multiple angular cones around the Galactic center and Sun are calculated. Limits are also calculated for a baseline model of boosted dark matter produced from cold dark matter annihilation or decay. This is the first experimental search for boosted dark matter from the Galactic center or the Sun interacting in a terrestrial detector.
Published: 2017
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17. Measurement of the tau neutrino cross section in atmospheric neutrino oscillations with Super-Kamiokande

Author: K. Iyogi, W. Y. Ma, K. S. Ganezer, Yuuki Nakano, R. A. Wendell, A. T. Suzuki, J. F. Martin, Takahiro Hiraki, T. Hasegawa, Z. Li, T. Nakadaira, C. Simpson, T. Nakamura, Makoto Sakuda, K. Ito, C. Yanagisawa, J. Amey, L. H. V. Anthony, C. Kachulis, J. Kameda, N. McCauley, C. M. Nantais, Atsushi Takeda, Kimihiro Okumura, J. L. Palomino, P. Mijakowski, K. Huang, B. Quilain, R. Tacik, D. Fukuda, A. Kibayashi, S. Cao, C. Xu, K. Nishijima, Susana Molina Sedgwick, M. O. Wascko, J. L. Raaf, C. Bronner, Lester D.R. Thompson, Y. Hayato, Takaaki Kajita, T. Towstego, M. R. Vagins, T. Tsukamoto, T. Ishii, Yusuke Suda, Masaki Ishitsuka, J. G. Learned, S. Moriyama, C. Vilela, A. Minamino, K. Sakashita, S. Locke, T. Yoshida, G. Santucci, M. Ikeda, Masayuki Nakahata, Y. Uchida, F. d. M. Blaszczyk, T. Yano, C. W. Walter, L. R. Sulak, T. Sekiguchi, Erin O'Sullivan, K. Martens, Y. Nakajima, M. B. Smy, Xiao-yan Li, M. Jiang, K. E. Nakamura, L. Labarga, I. T. Lim, Volodymyr Takhistov, P. Weatherly, B. Richards, Y. Nishimura, M. Murdoch, Yasuhiro Kishimoto, Takashi Kobayashi, K. Frankiewicz, Ll. Marti, M. Murase, M. Koshiba, H. A. Tanaka, Yuta Kato, R. G. Park, T. Ishida, M. J. Wilking, S. N. Smith, H. K. Tanaka, Yoshihiro Suzuki, Makoto Hasegawa, R. Akutsu, R. J. Wilkes, Francesco Muto, A. Cole, J. Y. Kim, Kate Scholberg, Ke. Abe, A. Orii, S. Berkman, M. Miura, Seiko Hirota, J. L. Stone, Hiroyuki Sekiya, Y. Okajima, A. Pritchard, M. Hartz, Soo-Bong Kim, Yuichi Oyama, Y. Fukuda, R. P. Litchfield, S. Nakayama, A. Takenaka, L. Wan, F. Di Lodovico, S. Tobayama, K. Abe, K. Nakamura, M. Kuze, Y. Takeuchi, Shintaro Ito, W. R. Kropp, Y. M. Zhang, T. Hayashino, H. W. Sobel, D. Hamabe, M. Friend, S. Mine, K. M. Tsui, A. Konaka, Yusuke Koshio, H. Nagata, G. Yang, J. Gustafson, Hirokazu Ishino, T. Tomura, Yoshitaka Kuno, H. Okazawa, S. Matsuno, Shigeki Tasaka, M. Elnimr, K. Choi, Pablo Fernandez, J. S. Jang, A. Himmel, R. G. Calland, E. Kearns, Masashi Yokoyama, N. D. Patel, T. Ishizuka, Tsuyoshi Nakaya, C. K. Jung, Masato Shiozawa, Y. Choi, Y. Sonoda, Yoshitaka Itow, G. Pronost, John Hill, D. L. Wark, M. Mori, Song Chen, and Science and Technology Facilities Council (STFC)
Subjects: Particle physics, Physics::Instrumentation and Detectors, Solar neutrino, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astronomy & Astrophysics, 01 natural sciences, Physics, Particles & Fields, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Tau neutrino, 0103 physical sciences, 010306 general physics, Neutrino oscillation, DETECTOR, Charged current, Physics, Science & Technology, hep-ex, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Solar neutrino problem, Physical Sciences, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Super-Kamiokande
Abstract: Using 5326 days of atmospheric neutrino data, a search for atmospheric tau neutrino appearance has been performed in the Super-Kamiokande experiment. Super-Kamiokande measures the tau normalization to be 1.47±0.32 under the assumption of normal neutrino hierarchy, relative to the expectation of unity with neutrino oscillation. The result excludes the hypothesis of no-tau appearance with a significance level of 4.6σ. The inclusive charged-current tau neutrino cross section averaged by the tau neutrino flux at Super-Kamiokande is measured to be (0.94±0.20)×10−38 cm2. The measurement is consistent with the Standard Model prediction, agreeing to within 1.5σ.
Published: 2017
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18. Search for Neutrinos in Super-Kamiokande associated with Gravitational Wave Events GW150914 and GW151226

Author: Takahiro Hiraki, Y. Totsuka, S. Cao, Hirokazu Ishino, C. Bronner, T. Kayano, C. W. Walter, K. Sakashita, J. G. Learned, Seiko Hirota, J. S. Jang, A. T. Suzuki, T. Tsukamoto, Yoshitaka Itow, C. Xu, H. K. Tanaka, R. J. Wilkes, Takaaki Kajita, T. Ishida, J. F. Martin, J. L. Raaf, M. Goldhaber, Hiroyuki Sekiya, T. Nakadaira, A. Himmel, Yejin Zhang, T. Ishii, Y. Fukuda, L. Wan, Y. Kuno, Makoto Sakuda, R. G. Calland, T. Suzuki, Z. Li, Shigeki Tasaka, Y. Takeuchi, C. Kachulis, V. Takhistov, K. Huang, K. Haga, Atsushi Takeda, S. Mine, A. Kibayashi, C. Yanagisawa, J. L. Palomino, Y. Hayato, B. L. Hartfiel, John Hill, K. Martens, M. Miura, J. Gustafson, L. Labarga, Y. Nishimura, K. Nishijima, T. Kobayashi, A. Konaka, Takehisa Hasegawa, K. Kaneyuki, N. Hong, Tomohiko Nakajima, T. Sekiguchi, Erin O'Sullivan, M. Friend, M. R. Vagins, Kimihiro Okumura, Joshua Hignight, Yusuke Koshio, H. A. Tanaka, T. Tomura, Yasunari Suzuki, K. Iyogi, C. K. Jung, S. Moriyama, R. A. Wendell, Kate Scholberg, G. Santucci, Masayuki Nakahata, H. Okazawa, Takaaki Mori, E. Richard, M. Hartz, Song Chen, I. T. Lim, W. R. Kropp, Masato Shiozawa, Y. Choi, S. Tobayama, M. Jiang, J. L. Stone, Yasuhiro Kishimoto, M. Ikeda, S. Nakayama, L. R. Sulak, T. Yano, K. Nakamura, R. Tacik, D. Fukuda, S. Matsuno, C. Nantais, S. B. Kim, J. Y. Kim, J. Kameda, A. Orii, E. Kearns, Masashi Yokoyama, K. Choi, Pablo Fernandez, P. Mijakowski, N. D. Patel, T. Ishizuka, Tsuyoshi Nakaya, Kazuhiro Suzuki, S. N. Smith, Yusuke Suda, K. S. Ganezer, M. J. Wilking, K. Frankiewicz, T. Nakamura, J. Imber, M. B. Smy, Xiao-yan Li, Ll. Marti, S. Berkman, Yuichi Oyama, A. Minamino, K. Abe, M. Koshiba, R. G. Park, F. d. M. Blaszczyk, P. Weatherly, R. Akutsu, Yuuki Nakano, H. W. Sobel, and UAM. Departamento de Física Teórica
Subjects: Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, 7. Clean energy, 01 natural sciences, Gravitational waves, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Coincident, 0103 physical sciences, GW151226, Neutrinos, 010303 astronomy & astrophysics, Zenith, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Muon, 010308 nuclear & particles physics, Gravitational wave, High Energy Physics::Phenomenology, Física, Astronomy and Astrophysics, 13. Climate action, Space and Planetary Science, High Energy Physics::Experiment, Neutrino, Astroparticle physics, Super-Kamiokande, Astrophysics - High Energy Astrophysical Phenomena, Event (particle physics)
Abstract: Astrophysical Journal Letters 830.1 (2016): L11 reproduced by permission of the AAS, We report the results from a search in Super-Kamiokande for neutrino signals coincident with the first detected gravitational-wave events, GW150914 and GW151226, as well as LVT151012, using a neutrino energy range from 3.5 MeV to 100 PeV. We searched for coincident neutrino events within a time window of ±500 s around the gravitational-wave detection time. Four neutrino candidates are found for GW150914, and no candidates are found for GW151226. The remaining neutrino candidates are consistent with the expected background events. We calculated the 90% confidence level upper limits on the combined neutrino fluence for both gravitational-wave events, which depends on event energy and topologies. Considering the upward-going muon data set (1.6 GeV-100 PeV), the neutrino fluence limit for each gravitational-wave event is 14-37 (19-50) cm-2 for muon neutrinos (muon antineutrinos), depending on the zenith angle of the event. In the other data sets, the combined fluence limits for both gravitational-wave events range from 2.4 ×104 to 7.0 ×109 cm-2, The Super-Kamiokande experiment has been built and operated from funding by the Japanese Ministry of Education, Culture, Sports, Science and Technology, the U.S. Department of Energy, and the U.S. National Science Foundation. Some of us have been supported by funds from the Korean Research Foundation (BK21 and KNRC), the National Research Foundation of Korea (NRF-20110024009), the European Union (H2020 RISE-GA641540-SKPLUS), the Japan Society for the Promotion of Science, the National Natural Science Foundation of China under grant No. 11235006, and the Scinet and Westgrid consortia of Compute Canada
Published: 2016

19. Neurobiological Basis and Pharmacologic Treatment of Social Impairment in Autism Spectrum Disorders

Author: K. Yui, M. Koshiba, and S. Nakamura
Subjects: Pharmacology, Psychiatry and Mental health, medicine, Autism, Pharmacology (medical), medicine.disease, Psychology, Clinical psychology, Pharmacological treatment
Published: 2012
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20. Study of TeV neutrinos with upward showering muons in Super-Kamiokande

Author: C. W. Walter, R. Wendell, R. Svoboda, T. Ishizuka, S. Yamada, T. Sasaki, M. Yoshida, H. G. Berns, M. B. Smy, Y. Furuse, K. Kaneyuki, C. Saji, Masashi Yokoyama, R. Terri, A. Minamino, J. Dunmore, Takaaki Kajita, Y. Totsuka, K. Iida, M. Koshiba, Y. Oyama, B. S. Yang, Y. Choi, K. Ishihara, T. J. Haines, T. Sato, D. W. Liu, Haruki Watanabe, Masato Shiozawa, N. Tamura, H. Nishino, I. Kato, Lawrence Sulak, J. L. Raaf, J. L. Stone, S. Mine, Y. Takeuchi, Atsushi Takeda, E. Kearns, S. T. Clark, C. Ishihara, Shantanu Desai, Kunio Inoue, M. Sugihara, H. Ishii, C. K. Jung, T. Ishida, M. Swanson, K. Abe, T. Kobayashi, K. Nishikawa, T. Nakaya, T. Nakadaira, Yusuke Koshio, K. Nitta, J. Yoo, S. Yamamoto, Kate Scholberg, J. Y. Kim, C. McGrew, M. R. Vagins, C. Yanagisawa, K. Kobayashi, Y. Obayashi, K. Washburn, W. E. Keig, M. Hasegawa, Shigetaka Moriyama, S. Likhoded, G. Mitsuka, K. Ueshima, I. S. Jeong, M. Sakuda, Y. Hayato, R. Gran, T. Hasegawa, F. Dufour, I. T. Lim, H. K. Seo, A. K. Ichikawa, J. S. Jang, T. Tanaka, D. Kielczewska, Y. Kuno, K. Nishijima, S. Nakayama, M. Ishitsuka, N. Tanimoto, S. Tasaka, H. Okazawa, R. J. Wilkes, W. Wang, Masayuki Nakahata, Alec Habig, T. Koike, B. Hartfiel, Y. Takenaga, K. Okumura, Y. Fukuda, Y. Idehara, K. S. Ganezer, M. Miura, Hirokazu Ishino, M. D. Messier, C. Regis, J. Kameda, Katsuki Hiraide, S. Dazeley, J. P. Cravens, T. Ishii, H. Sato, Y. Gando, J. Hill, Yasunari Suzuki, S. Matsuno, G. Guillian, A. T. Suzuki, H. W. Sobel, Eric Thrane, M. Fechner, Y. Watanabe, W. R. Kropp, S. B. Kim, A. Clough, David William Casper, C. Mitsuda, H. Ogawa, K. K. Shiraishi, I. Higuchi, J. G. Learned, H. Maesaka, M. Goldhaber, T. Kato, Yoshitaka Itow, S. Hatakeyama, K. Nakamura, and A. Sarrat
Subjects: Physics, Muon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Bremsstrahlung, Astronomy and Astrophysics, High Energy Physics - Experiment, Nuclear physics, Pair production, WIMP, High Energy Physics::Experiment, Neutrino, Astrophysics - High Energy Astrophysical Phenomena, Super-Kamiokande, Neutrino oscillation, Zenith
Abstract: A subset of neutrino-induced upward through-going muons in the Super-Kamiokande detector consists of high energy muons which lose energy through radiative processes such as bremsstrahlung, e^{+} e^{-} pair production and photonuclear interactions. These ``upward showering muons'' comprise an event sample whose mean parent neutrino energy is approximately 1 TeV. We show that the zenith angle distribution of upward showering muons is consistent with negligible distortion due to neutrino oscillations, as expected of such a high-energy neutrino sample. We present astronomical searches using these high energy events, such as those from WIMP annihilations in the Sun, Earth and Galactic Center, some suspected point sources, as well as searches for diffuse flux from the interstellar medium., Comment: Submitted for publication to Astroparticle Physics. Fig 12 has slightly higher resolution in the version submitted to the journal
Published: 2008
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21. First measurement of radioactive isotope production through cosmic-ray muon spallation in Super-Kamiokande IV

Author: H.A. Tanaka, K. Martens, M. Koshiba, Yuuki Nakano, C. Bronner, W. R. Kropp, S. Tobayama, K. Huang, J. G. Learned, K. Nakamura, Y. Nishimura, P. de Perio, A. Kibayashi, J. S. Jang, A. Himmel, A. L. Renshaw, Y. M. Zhang, A. T. Suzuki, J. F. Martin, C. W. Walter, H. W. Sobel, Y. Hayato, C. K. Jung, Masato Shiozawa, Y. Choi, N. Hong, T. Nakadaira, J. Kameda, Makoto Sakuda, C. Yanagisawa, P. Weatherly, E. Kearns, Masashi Yokoyama, T. Tsukamoto, K. Frankiewicz, J. L. Raaf, Joshua Hignight, T. Ishizuka, Tsuyoshi Nakaya, C. Kachulis, K. Kaneyuki, John Hill, Hiroyuki Sekiya, L. Labarga, A. Minamino, T. Kobayashi, P. Mijakowski, T. Sekiguchi, K. Nishijima, G. Carminati, C. Nantais, S. B. Kim, J. Y. Kim, A. Orii, Y. Fukuda, I. Kametani, K. Choi, Pablo Fernandez, J. L. Palomino, S. Berkman, Kazuhiro Suzuki, Y. Takeuchi, Y. Totsuka, Susumu Takahashi, T. Wongjirad, T. J. Irvine, Shaomin Chen, Yasunari Suzuki, Takaaki Kajita, H. K. Tanaka, Takaaki Mori, M. Miura, B. L. Hartfiel, Atsushi Takeda, Yuichi Oyama, K. Iyogi, S. Nakayama, T. Yano, K. Ieki, Y. Haga, M. Ikeda, Z. Li, M. R. Vagins, T. Ishii, M. J. Wilking, Shigeki Tasaka, R. J. Wilkes, A. Konaka, T. Ishida, M. Friend, J. L. Stone, N. J. Griskevich, E. Richard, R. A. Wendell, K. Abe, Yusuke Koshio, Yoshitaka Itow, R. Tacik, T. Tomura, Kimihiro Okumura, Yusuke Suda, K. Sakashita, I. T. Lim, T. Suzuki, H. Okazawa, S. Moriyama, Masayuki Nakahata, J. Imber, Yasuhiro Kishimoto, M. Goldhaber, K. S. Ganezer, M. B. Smy, Xiao-yan Li, Ll. Marti, Seiko Hirota, T. Kikawa, S. Matsuno, V. Takhistov, T. Kayano, S. N. Smith, Y. Kuno, L. R. Sulak, S. Mine, J. Gustafson, Takehisa Hasegawa, Tomohiko Nakajima, Kate Scholberg, M. Hartz, and Hirokazu Ishino
Subjects: Physics, Particle physics, Physics - Instrumentation and Detectors, Muon, 010308 nuclear & particles physics, Chlorine-36, Order (ring theory), 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Phenomenology, 13. Climate action, 0103 physical sciences, Neutron, Production (computer science), Neutrino, Astrophysics - High Energy Astrophysical Phenomena, 010306 general physics, Super-Kamiokande, Energy (signal processing)
Abstract: Cosmic-ray-muon spallation-induced radioactive isotopes with $\beta$ decays are one of the major backgrounds for solar, reactor, and supernova relic neutrino experiments. Unlike in scintillator, production yields for cosmogenic backgrounds in water have not been exclusively measured before, yet they are becoming more and more important in next generation neutrino experiments designed to search for rare signals. We have analyzed the low-energy trigger data collected at Super-Kamiokande-IV in order to determine the production rates of $^{12}$B, $^{12}$N, $^{16}$N, $^{11}$Be, $^9$Li, $^8$He, $^9$C, $^8$Li, $^8$B and $^{15}$C. These rates were extracted from fits to time differences between parent muons and subsequent daughter $\beta$'s by fixing the known isotope lifetimes. Since $^9$Li can fake an inverse-beta-decay reaction chain via a $\beta + n$ cascade decay, producing an irreducible background with detected energy up to a dozen MeV, a dedicated study is needed for evaluating its impact on future measurements; the application of a neutron tagging technique using correlated triggers was found to improve this $^9$Li measurement. The measured yields were generally found to be comparable with theoretical calculations, except the cases of the isotopes $^8$Li/$^8$B and $^9$Li., Comment: 12 pages, 6 figures, accepted by PRD for publication
Published: 2016
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22. Search for Neutrinos from Annihilation of Captured Low-Mass Dark Matter Particles in the Sun by Super-Kamiokande

Author: K. Iyogi, R. A. Wendell, A. T. Suzuki, J. F. Martin, Y. Kuno, K. Kaneyuki, Atsushi Takeda, T. Sekiguchi, S. Berkman, A. Minamino, T. Nakadaira, Y. Takeuchi, John Hill, K. Ieki, Hirokazu Ishino, Makoto Sakuda, J. L. Raaf, Yasunari Suzuki, J. G. Learned, K. Choi, R. J. Wilkes, Kimihiro Okumura, K. S. Ganezer, S. N. Smith, Seiko Hirota, M. Miura, I. Kametani, T. Kikawa, E. Kearns, T. Tsukamoto, C. W. Walter, L. Labarga, K. Sakashita, T. Kobayashi, Yasuhiro Kishimoto, K. Nakamura, Takaaki Kajita, M. Koshiba, S. Matsuno, Masashi Yokoyama, Shigeki Tasaka, Takaaki Mori, M. Goldhaber, J. L. Stone, Y. Hayato, Yejin Zhang, S. Moriyama, C. Yanagisawa, T. Ishida, R. Tacik, Masayuki Nakahata, Yoshinori Haga, Hiroyuki Sekiya, K. Martens, K. Huang, T. Tomura, A. Kibayashi, T. Ishizuka, J. Kameda, S. Mine, Yoshitaka Itow, H. Okazawa, A. Konaka, Tsuyoshi Nakaya, Y. Fukuda, K. P. Lee, P. Mijakowski, T. J. Irvine, C. K. Jung, J. Imber, H.A. Tanaka, T. McLachlan, M. Ikeda, K. Nishijima, T. Akiri, M. J. Wilking, Kazuhiro Suzuki, Masato Shiozawa, Y. Choi, Song Chen, T. Hasegawa, M. R. Vagins, Yusuke Koshio, C. Bronner, Kate Scholberg, G. Mitsuka, S. Nakayama, T. Ishii, I. T. Lim, J. S. Jang, H. W. Sobel, W. R. Kropp, S. Tobayama, A. Himmel, Yuuki Nakano, S. B. Kim, J. Y. Kim, L. R. Sulak, M. B. Smy, P. de Perio, T. Yano, A. L. Renshaw, Yuichi Oyama, K. Abe, Y. Nishimura, N. Hong, Joshua Hignight, Y. Totsuka, Susumu Takahashi, T. Wongjirad, Ll. Marti, G. Carminati, and UAM. Departamento de Física Teórica
Subjects: Physics, Particle physics, Atmospheric neutrinos, Annihilation, Muon, Physics::Instrumentation and Detectors, Dark matter, General Physics and Astronomy, Física, Surrounding rock, Coupling (probability), Elastic scattering cross sections, Low mass, Upper limits, Nuclear physics, Weakly interacting massive particles, WIMP, Dark matter particles, High Energy Physics::Experiment, Neutrino, Super-Kamiokande
Abstract: Artículo escrito por muchos autores, sólo se referencian el primero, los autores que firman como Universidad Autónoma de Madrid y el grupo de colaboración en el caso de que aparezca en el artículo, Super-Kamiokande (SK) can search for weakly interacting massive particles (WIMPs) by detecting neutrinos produced from WIMP annihilations occurring inside the Sun. In this analysis, we include neutrino events with interaction vertices in the detector in addition to upward-going muons produced in the surrounding rock. Compared to the previous result, which used the upward-going muons only, the signal acceptances for light (few-GeV/c2-200-GeV/c2) WIMPs are significantly increased. We fit 3903 days of SK data to search for the contribution of neutrinos from WIMP annihilation in the Sun. We found no significant excess over expected atmospheric-neutrino background and the result is interpreted in terms of upper limits on WIMP-nucleon elastic scattering cross sections under different assumptions about the annihilation channel. We set the current best limits on the spin-dependent WIMP-proton cross section for WIMP masses below 200 GeV/c2 (at 10 GeV/c2, 1.49×10-39 cm2 for χχ→bb¯ and 1.31×10-40 cm2 for χχ→τ+τ- annihilation channels), also ruling out some fraction of WIMP candidates with spin-independent coupling in the few-GeV/c2 mass range, The Super-Kamiokande experiment was built and has been operated with funding from the Japanese Ministry of Education, Culture, Sports, Science and Technology, the U.S. Department of Energy, and the U.S. National Science Foundation
Published: 2015
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23. Test of Lorentz invariance with atmospheric neutrinos

Author: Susumu Takahashi, T. Wongjirad, H. Okazawa, C. K. Jung, Yuichi Oyama, K. Ieki, T. Ishii, K. Sakashita, Masato Shiozawa, Y. Choi, R. J. Wilkes, R. Yamaguchi, K. Abe, Hirokazu Ishino, M. Ikeda, T. J. Irvine, J. Kameda, P. Fernandez, P. Mijakowski, Kazuhiro Suzuki, K. Martens, Y. Nishimura, M. Goldhaber, Yejin Zhang, S. Matsuno, K. Iyogi, J. S. Jang, S. Moriyama, S. B. Kim, J. Y. Kim, M. Koshiba, Y. Takeuchi, C. Yanagisawa, N. Hong, A. Himmel, Masayuki Nakahata, K. P. Lee, Lawrence Sulak, Atsushi Takeda, Joshua Hignight, Yoshihiro Suzuki, Takaaki Mori, J. L. Stone, A. T. Suzuki, K. Kaneyuki, T. Sekiguchi, K. Nishijima, Kate Scholberg, J. F. Martin, T. Nakadaira, Shigeki Tasaka, A. Konaka, B. L. Hartfiel, John Hill, S. Mine, Makoto Sakuda, J. Gustafson, E. Kearns, Yusuke Suda, Masashi Yokoyama, P. de Perio, T. Yano, A. L. Renshaw, Takehisa Hasegawa, Yusuke Koshio, Kimihiro Okumura, C. W. Walter, S. N. Smith, T. Ishizuka, J. Imber, M. Miura, Tsuyoshi Nakaya, W. E. Keig, M. B. Smy, T. Akiri, G. Carminati, K. Tateishi, Y. Haga, Hiroyuki Sekiya, K. Choi, Ll. Marti, L. Labarga, T. Kobayashi, Yoshitaka Itow, Seiko Hirota, T. Kikawa, Y. Fukuda, Y. Kuno, S. Berkman, J. G. Learned, T. McLachlan, E. Richard, P. Weatherly, Takaaki Kajita, K. Connolly, A. Minamino, Yasuhiro Kishimoto, Y. Hayato, R. A. Wendell, Song Chen, H. K. Tanaka, Yuuki Nakano, H.A. Tanaka, V. Takhistov, H. W. Sobel, C. Bronner, M. R. Vagins, I. Kametani, R. Tacik, A. Murakami, G. Mitsuka, I. T. Lim, K. Huang, S. Nakayama, K. S. Ganezer, A. Kibayashi, T. Tsukamoto, T. Ishida, T. Yokozawa, W. R. Kropp, S. Tobayama, K. Nakamura, J. L. Raaf, M. J. Wilking, Koh Ueno, Y. Totsuka, T. Tomura, and UAM. Departamento de Física Teórica
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Lorentz transformation, High Energy Physics::Phenomenology, Isotropy, FOS: Physical sciences, Física, Lorentz covariance, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), symbols.namesake, Orders of magnitude (time), Standard-Model Extension, 0103 physical sciences, Range (statistics), symbols, High Energy Physics::Experiment, Neutrino, 010306 general physics, Neutrino oscillation
Abstract: Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAM, A search for neutrino oscillations induced by Lorentz violation has been performed using 4,438 live-days of Super-Kamiokande atmospheric neutrino data. The Lorentz violation is included in addition to standard three-flavor oscillations using the nonperturbative standard model extension (SME), allowing the use of the full range of neutrino path lengths, ranging from 15 to 12,800 km, and energies ranging from 100 MeV to more than 100 TeV in the search. No evidence of Lorentz violation was observed, so limits are set on the renormalizable isotropic SME coefficients in the eμ, μτ, and eτ sectors, improving the existing limits by up to 7 orders of magnitude and setting limits for the first time in the neutrino μτ sector of the SME, We would like to thank A. Kostelecky for his advice and support and we are grateful to J. S. Diaz for working closely with us to calculate and implement the Lorentz-violating oscillation probabilities. The authors gratefully acknowledge the cooperation of the Kamioka Mining and Smelting Company. Super-K has been built and operated from funds provided by the Japanese Ministry of Education, Culture, Sports, Science and Technology, the U.S. Department of Energy, and the U.S. National Science Foundation. This work was partially supported by the Research Foundation of Korea (BK21 and KNRC), the Korean Ministry of Science and Technology, the National Science Foundation of China, the European Union FP7 (DS laguna-lbno PN- 284518 and ITN invisibles GA-2011-289442), the National Science and Engineering Research Council (NSERC) of Canada, and the Scinet and Westgrid consortia of Compute Canada
Published: 2015
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24. The Super-Kamiokande detector

Author: Kimihiro Okumura, Makoto Sakuda, B. K. Kim, S. Fukuda, K. Martens, S. Moriyama, Toshio Suzuki, Todd Haines, S. B. Boyd, M. L. Chen, T. Hasegawa, Z. Conner, M. Kitaguchi, K. Nishikawa, K. S. Ganezer, Alec Habig, M. Earl, B. Viren, J. Kameda, M. Koga, H. Okazawa, R. W. Ellsworth, A. Okada, M. Takahashi, J. S. George, K. Ishihara, Atsumu Suzuki, T. Inagaki, Shoichi Yamada, Takaaki Kajita, S. Matsuno, T. Iwashita, K. Fujita, H. G. Berns, M. Ishitsuka, S. Desai, Koji Nakamura, M. Miura, Y. Ichikawa, Mikio Morii, E. Guillian, C. K. Jung, M. Takahata, H. Nishihama, J. Hsu, K. Ito, Toshio Namba, D. Kielczewska, T. Ishii, Kunio Inoue, S. Nakayama, John G. Learned, I. Kato, M. Etoh, I. Nishiyama, T. Futagami, A. L. Stachyra, K. Miyano, C. Saji, Y. Hatakeyama, T. Hayakawa, H. Maesaka, R. A. Doyle, Florian Goebel, M. B. Smy, J. L. Stone, D. W. Liu, David William Casper, E. Ichihara, T. Hashimoto, A. K. Ichikawa, C. Yanagisawa, K. Nishijima, S. Hatakeyama, M. Kohama, Akira Hasegawa, G. W. Sullivan, Henry W. Sobel, K. Nitta, Y. Kobayashi, A. Sakai, M. Takita, M. Ackerman, Frederick Reines, L. R. Price, J. Shirai, W. Wang, T. Horiuchi, H. Takeda, V. J. Stenger, M. Masuzawa, E. Sharkey, Minoru Yoshida, Yoshitaka Itow, D. Turcan, S. Inaba, N. Sakurai, T. Takayama, Y. Kanaya, M. Kirisawa, R. Svoboda, M. Koike, J. Hill, Shuji Yamamoto, A. Kusano, K. Higuchi, Hiroaki Nishimura, Masaya Hasegawa, Y. Watanabe, K. Kaneyuki, T. Kobayashi, R. Sanford, Osamu Sasaki, Magdalena Malek, Y. Kajiyama, A. Kibayashi, L. R. Sulak, W. Doki, S. Tasaka, T. Toshito, W. E. Keig, Y. Nagashima, H. Fujiyasu, J. A. Goodman, J. T. Hong, Y. Takeuchi, F. Tsushima, C. W. Walter, Soo-Bong Kim, S. Kasuga, Y. Fukuda, E. Kearns, Y. Totsuka, M. Koshiba, Hyosun Kim, C. McGrew, Yoshihiro Suzuki, K. Kobayashi, M. Nemoto, D. Kerr, T. Maruyama, Takashi Yamaguchi, M. D. Messier, S. Echigo, T. Kato, C. Mitsuda, P. G. Halverson, R. J. Wilkes, U. Golebiewska, K. K. Young, S. Mine, Y. Obayashi, Y. Gando, E. Blaufuss, Junichi Kanzaki, C. Mauger, J. Yoo, Masato Shiozawa, T. Barszczak, T. Oyabu, A. Suzuki, Tsuyoshi Nakaya, Masayuki Nakahata, Hirokazu Ishino, L. Wai, M. Oketa, J. W. Flanagan, Hiroshi Ogawa, M. R. Vagins, H. Kobayashi, W. Gajewski, Kate Scholberg, W. R. Kropp, Y. Oyama, Y. Hayato, T. Iwamoto, and Yusuke Koshio
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, Cherenkov detector, Solar neutrino, High Energy Physics::Phenomenology, T2K experiment, law.invention, Neutrino detector, law, High Energy Physics::Experiment, Neutrino astronomy, Neutrino, Super-Kamiokande, Neutrino oscillation, Instrumentation
Abstract: Super-Kamiokande is the world's largest water Cherenkov detector, with net mass 50,000 tons. During the period April, 1996 to July, 2001, Super-Kamiokande I collected 1678 live-days of data, observing neutrinos from the Sun, Earth's atmosphere, and the K2K long-baseline neutrino beam with high efficiency. These data provided crucial information for our current understanding of neutrino oscillations, as well as setting stringent limits on nucleon decay. In this paper, we describe the detector in detail, including its site, configuration, data acquisition equipment, online and offline software, and calibration systems which were used during Super-Kamiokande I.
Published: 2003
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25. Search for Nucleon and Dinucleon Decays with an Invisible Particle and a Charged Lepton in the Final State at the Super-Kamiokande Experiment

Author: K. Kaneyuki, K. Sakashita, K. Nakamura, T. Sekiguchi, M. Goldhaber, I. Kametani, C. K. Jung, W. R. Kropp, S. Tobayama, S. Moriyama, Yejin Zhang, T. J. Irvine, T. Ishii, R. A. Wendell, T. Tomura, Masayuki Nakahata, Yusuke Suda, Masato Shiozawa, Y. Choi, Y. Totsuka, Song Chen, Susumu Takahashi, M. Hartz, T. Wongjirad, R. Tacik, H. Okazawa, Atsushi Takeda, M. Ikeda, J. Imber, K. Ieki, A. T. Suzuki, T. Tsukamoto, J. L. Raaf, R. J. Wilkes, J. F. Martin, M. B. Smy, Xiao-yan Li, T. Nakadaira, C. W. Walter, T. Ishida, E. Richard, E. Kearns, C. Yanagisawa, Makoto Sakuda, Masashi Yokoyama, B. L. Hartfiel, Ll. Marti, Seiko Hirota, M. J. Wilking, T. Kikawa, K. Nishijima, C. Kachulis, T. Ishizuka, Y. Nishimura, L. R. Sulak, Kimihiro Okumura, Yuichi Oyama, Tsuyoshi Nakaya, Shigeki Tasaka, V. Takhistov, J. S. Jang, Hiroyuki Sekiya, N. Hong, J. L. Palomino, A. Himmel, T. Kayano, Yasuhiro Kishimoto, Joshua Hignight, Yoshihiro Suzuki, Y. Fukuda, K. Abe, L. Labarga, T. Kobayashi, A. Konaka, S. Berkman, Y. Kuno, Y. Takeuchi, P. de Perio, T. Hasegawa, A. L. Renshaw, K. Choi, Pablo Fernandez, K. Iyogi, Yusuke Koshio, K. Frankiewicz, M. Friend, T. Suzuki, Takaaki Kajita, C. Nantais, S. B. Kim, J. Y. Kim, A. Orii, H. W. Sobel, John Hill, K. Huang, A. Kibayashi, M. R. Vagins, I. T. Lim, J. G. Learned, H. K. Tanaka, Yoshitaka Itow, Takaaki Mori, J. L. Stone, Yuuki Nakano, M. Miura, K. S. Ganezer, H.A. Tanaka, G. Carminati, Y. Haga, S. N. Smith, P. Weatherly, C. Bronner, S. Nakayama, T. Yano, K. Martens, A. Minamino, S. Mine, M. Koshiba, S. Matsuno, J. Gustafson, J. Kameda, Hirokazu Ishino, P. Mijakowski, Z. Li, Kazuhiro Suzuki, Tomohiko Nakajima, Y. Hayato, Kate Scholberg, and UAM. Departamento de Física Teórica
Subjects: Physics, Particle physics, High Energy Physics::Phenomenology, Confidence levels, General Physics and Astronomy, Nucleon decays, Física, FOS: Physical sciences, State (functional analysis), Super-Kamiokande experiment, Invisible particle, High Energy Physics - Experiment, Nuclear physics, Massless particle, High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Bound state, Particle, High Energy Physics::Experiment, Nucleon, Super-Kamiokande, Lepton
Abstract: Artículo escrito por muchos autores, sólo se referencian el primero, los autores que firman como Universidad Autónoma de Madrid y el grupo de colaboración en el caso de que aparezca en el artículo, Search results for nucleon decays p→e+X, p→μ+X, n→νγ (where X is an invisible, massless particle) as well as dinucleon decays np→e+ν, np→μ+ν, and np→τ+ν in the Super-Kamiokande experiment are presented. Using single-ring data from an exposure of 273.4 kton·yr, a search for these decays yields a result consistent with no signal. Accordingly, lower limits on the partial lifetimes of τp→e+X>7.9×1032yr, τp→μ+X>4.1×1032yr, τn→νγ>5.5×1032yr, τnp→e+ν>2.6×1032yr, τnp→μ+ν>2.2×1032yr, and τnp→τ+ν>2.9×1031yr at a 90% confidence level are obtained. Some of these searches are novel, The Super- Kamiokande experiment was built and has been operated with funding from the Japanese Ministry of Education, Culture, Sports, Science and Technology, the U.S. Department of Energy, and the U.S. National Science Foundation
Published: 2015
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26. Search for proton decay viap→νK+using260 kiloton·yeardata of Super-Kamiokande

Author: Shigeki Tasaka, E. Kearns, Y. Takeuchi, Masashi Yokoyama, K. Martens, S. Moriyama, M. Miyake, Yuichi Oyama, Masayuki Nakahata, T. Ishizuka, Tsuyoshi Nakaya, C. W. Walter, Takaaki Mori, Takaaki Kajita, K. Abe, A. T. Suzuki, K. P. Lee, K. S. Ganezer, J. L. Stone, L. Labarga, T. Kobayashi, T. Nakadaira, Makoto Sakuda, K. Sakashita, M. Dziomba, K. Choi, K. Ieki, T. Tsukamoto, Joshua Hignight, Yoshihiro Suzuki, Hiroyuki Sekiya, R. J. Wilkes, K. Iyogi, H. Kaji, H. W. Sobel, Y. Totsuka, J. Takeuchi, T. Wongjirad, I. Taylor, Y. Fukuda, H. Okazawa, T. Ishida, M. Goldhaber, C. Yanagisawa, S. B. Kim, J. Y. Kim, Song Chen, H. Sui, A. L. Renshaw, C. K. Jung, M. Ikeda, Masato Shiozawa, Y. Choi, Yoshitaka Itow, K. Nishijima, J. Kameda, J. Imber, T. Ishii, K. Connolly, Y. Hayato, Atsushi Takeda, P. Mijakowski, S. N. Smith, H. Zhang, S. Matsuno, R. A. Wendell, T. McLachlan, A. Kibayashi, Ll. Marti, John Hill, Yusuke Koshio, S. Nakayama, W. E. Keig, K. Kaneyuki, T. Sekiguchi, K. Bays, Justin Albert, Y. Kuno, J. S. Jang, T. Yokozawa, Y. Takenaga, M. Miura, J. L. Raaf, J. G. Learned, L. R. Sulak, M. B. Smy, Koh Ueno, Y. Obayashi, M. R. Vagins, W. R. Kropp, K. Nakamura, A. Murakami, G. Mitsuka, I. T. Lim, A. Minamino, K. Nishikawa, M. Koshiba, Ko Okumura, S. Mine, Takehisa Hasegawa, Hidetoshi Kubo, Hirokazu Ishino, Zishuo Yang, Kate Scholberg, and G. Carminati
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Proton, Proton decay, Super-Kamiokande, Lower limit
Abstract: We have searched for proton decay via p→νK+ using Super-Kamiokande data from April 1996 to February 2013, 260 kiloton•year exposure in total. No evidence for this proton decay mode is found. A lower limit of the proton lifetime is set to τ/B(p→νK+)>5.9×1033 years at 90% confidence level.
Published: 2014
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27. Search for Nucleon Decay vian→ν¯π0andp→ν¯π+in Super-Kamiokande

Author: G. Lopez, Song Chen, R. A. Wendell, A. Minamino, K. Ueshima, T. Iida, M. Vagins, H. Toyota, K. Iyogi, E. Thrane, Makoto Miura, Masayuki Nakahata, Justin Albert, S. B. Kim, K. Abe, S. Nakayama, J. Y. Kim, K. P. Lee, Y. Kuno, S. Mino, T. Tanaka, J. G. Learned, K. Kaneyuki, K. S. Ganezer, H. Kaji, M. Dziomba, Takaaki Mori, J. Schuemann, Y. Totsuka, R. J. Wilkes, Zishuo Yang, N. Tanimoto, T. Sekiguchi, K. Bays, C. Yanagisawa, K. Nishikawa, L. R. Sulak, Koji Nakamura, Kate Scholberg, T. Wongjirad, A. T. Suzuki, Atsushi Takeda, C. Regis, P. Mijakowski, T. Nakadaira, Koh Ueno, J. Kameda, C. K. Jung, J. L. Raaf, D. Kielczewska, K. Martens, Ll. Marti, S. Mine, E. Kearns, Makoto Sakuda, Y. Heng, Y. Shimizu, S. N. Smith, C. Ishihara, Minoru Yoshida, K. Nishijima, A. Kibayashi, M. Koshiba, Hirokazu Ishino, S. Matsuno, T. Yokozawa, K. Sakashita, Ko Okumura, T. Tsukamoto, I. Taylor, H. Zhang, Y. Takenaga, Y. Hayato, M. Goldhaber, J. S. Jang, Y. Kozuma, T. Ishii, L. Labarga, B. S. Yang, T. Kobayashi, W. R. Kropp, K. Connolly, Y. Obayashi, S. Yamada, T. Ishida, Y. Koshio, G. Mitsuka, I. T. Lim, Yoshihiro Suzuki, Henry W. Sobel, Shigetaka Moriyama, A. L. Renshaw, John Hill, W. E. Keig, Yoshitaka Itow, Yuichi Oyama, T. McLachlan, H. Okazawa, C. W. Walter, T. Kajita, Masashi Yokoyama, Hiroyuki Sekiya, Y. Fukuda, T. Ishizuka, Y. Takeuchi, Tsuyoshi Nakaya, M. B. Smy, Michael Litos, M. Ikeda, Masato Shiozawa, Y. Choi, T. Hasegawa, J. L. Stone, and Shigeki Tasaka
Subjects: Physics, Particle physics, Proton, Physics beyond the Standard Model, Higgs boson, General Physics and Astronomy, Neutron, Neutrino, Nucleon, Super-Kamiokande, Mixing (physics)
Abstract: 2Although there is strong theoretical support that na-ture can be described by a grand uni ed theory (GUT) [1,2], there is currently no direct experimental evidence.One of the most powerful ways to test grand uni cationis to look for proton (or bound neutron) decay. MostGUTs have an unstable proton; in the absence of anobservation, setting experimental limits on the protonlifetime can provide useful constraints on the nature ofgrand uni ed theories. Observation, on the other hand,would be tantalizing evidence of new physics beyond theStandard Model.One of the more simple but interesting candidates forgrand uni cation is SO(10), where the Standard Model’sSU(3), SU(2), and U(1) are contained within the largergauge group. The class of models based on SO(10) uni- cation generally make predictions for neutrino massesand mixing that are broadly in accord with all knownneutrino mixing data [3, 4]. The minimal supersym-metric SO(10) model with a 126 Higgs eld describedin Ref. [3] is the particular motivation for the analysispresented here. In addition to predicting neutrino massand mixing in agreement with observations, it leaves R-parity unbroken, which guarantees the existence of stabledark matter. For some region of its allowed parameterspace, this model predicts that the dominant nucleon de-cay modes will be p! ˇ
Published: 2014
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28. Search for Trilepton Nucleon Decay viap→e+ννandp→μ+ννin the Super-Kamiokande Experiment

Author: A. T. Suzuki, J. F. Martin, T. Nakadaira, I. Kametani, Y. Totsuka, Susumu Takahashi, T. Akiri, P. Mijakowski, Makoto Sakuda, A. Minamino, B. L. Hartfiel, T. Wongjirad, T. Ishii, T. Hasegawa, M. Koshiba, W. R. Kropp, Kazuhiro Suzuki, S. Matsuno, S. Tobayama, Yusuke Suda, K. Sakashita, Hirokazu Ishino, Y. Hayato, P. Weatherly, J. S. Jang, E. Kearns, A. Himmel, K. Ieki, J. Imber, R. J. Wilkes, C. W. Walter, L. R. Sulak, Ll. Marti, K. Choi, Pablo Fernandez, J. L. Stone, Masayuki Nakahata, K. S. Ganezer, Yoshitaka Itow, M. Goldhaber, K. Kaneyuki, Y. Nishimura, G. Carminati, Koh Ueno, S. N. Smith, V. Takhistov, Yuichi Oyama, J. L. Raaf, C. Yanagisawa, C. K. Jung, Yejin Zhang, L. Labarga, T. Kobayashi, N. Hong, Masato Shiozawa, Y. Choi, Yuuki Nakano, R. Yamaguchi, Joshua Hignight, Kate Scholberg, T. Kajita, Shigeki Tasaka, T. Tsukamoto, Yoshihiro Suzuki, M. Ikeda, Y. Kishimoto, Hiroyuki Sekiya, Y. Kuno, Y. Fukuda, A. Konaka, K. Martens, Takaaki Mori, K. Nishijima, S. Mine, R. Tacik, Yusuke Koshio, J. Gustafson, P. de Perio, T. Yano, S. Berkman, Y. Takeuchi, T. Ishida, A. L. Renshaw, T. McLachlan, E. Richard, M. B. Smy, Koji Nakamura, K. Tateishi, Atsushi Takeda, H. Okazawa, T. Yokozawa, M. J. Wilking, Masashi Yokoyama, T. J. Irvine, Henry W. Sobel, Shigetaka Moriyama, Yoshinori Haga, T. Ishizuka, S. B. Kim, K. Abe, S. Nakayama, J. Y. Kim, Tsuyoshi Nakaya, T. Tomura, K. Iyogi, John Hill, W. E. Keig, Kimihiro Okumura, Makoto Miura, Song Chen, R. A. Wendell, T. Sekiguchi, J. Kameda, K. Huang, A. Kibayashi, H.A. Tanaka, Seiko Hirota, T. Kikawa, M. Vagins, C. Bronner, J. G. Learned, H. K. Tanaka, K. Connolly, A. Murakami, G. Mitsuka, I. T. Lim, and K. P. Lee
Subjects: Physics, Nuclear physics, Particle physics, General Physics and Astronomy, Grand Unified Theory, Nucleon, Super-Kamiokande
Abstract: The trilepton nucleon decay modes p→e+νν and p→μ+νν violate |Δ(B-L)| by two units. Using data from a 273.4 kt yr exposure of Super-Kamiokande a search for these decays yields a fit consistent with no signal. Accordingly, lower limits on the partial lifetimes of τp→e+νν>1.7×10(32) years and τp→μ+νν>2.2×10(32) years at a 90% confidence level are obtained. These limits can constrain Grand Unified Theories which allow for such processes.
Published: 2014
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29. Search for trilepton nucleon decay via p→e+νν and p→μ+νν in the Super-Kamiokande experiment

Author: V, Takhistov, K, Abe, Y, Haga, Y, Hayato, M, Ikeda, K, Iyogi, J, Kameda, Y, Kishimoto, M, Miura, S, Moriyama, M, Nakahata, Y, Nakano, S, Nakayama, H, Sekiya, M, Shiozawa, Y, Suzuki, A, Takeda, H, Tanaka, T, Tomura, K, Ueno, R A, Wendell, T, Yokozawa, T, Irvine, T, Kajita, I, Kametani, K, Kaneyuki, K P, Lee, T, McLachlan, Y, Nishimura, E, Richard, K, Okumura, L, Labarga, P, Fernandez, S, Berkman, H A, Tanaka, S, Tobayama, J, Gustafson, E, Kearns, J L, Raaf, J L, Stone, L R, Sulak, M, Goldhaber, G, Carminati, W R, Kropp, S, Mine, P, Weatherly, A, Renshaw, M B, Smy, H W, Sobel, K S, Ganezer, B L, Hartfiel, J, Hill, W E, Keig, N, Hong, J Y, Kim, I T, Lim, T, Akiri, A, Himmel, K, Scholberg, C W, Walter, T, Wongjirad, T, Ishizuka, S, Tasaka, J S, Jang, J G, Learned, S, Matsuno, S N, Smith, T, Hasegawa, T, Ishida, T, Ishii, T, Kobayashi, T, Nakadaira, K, Nakamura, Y, Oyama, K, Sakashita, T, Sekiguchi, T, Tsukamoto, A T, Suzuki, Y, Takeuchi, C, Bronner, S, Hirota, K, Huang, K, Ieki, T, Kikawa, A, Minamino, A, Murakami, T, Nakaya, K, Suzuki, S, Takahashi, K, Tateishi, Y, Fukuda, K, Choi, Y, Itow, G, Mitsuka, P, Mijakowski, J, Hignight, J, Imber, C K, Jung, C, Yanagisawa, H, Ishino, A, Kibayashi, Y, Koshio, T, Mori, M, Sakuda, R, Yamaguchi, T, Yano, Y, Kuno, R, Tacik, S B, Kim, H, Okazawa, Y, Choi, K, Nishijima, M, Koshiba, Y, Suda, Y, Totsuka, M, Yokoyama, K, Martens, Ll, Marti, M R, Vagins, J F, Martin, P, de Perio, A, Konaka, M J, Wilking, S, Chen, Y, Zhang, K, Connolly, and R J, Wilkes
Abstract: The trilepton nucleon decay modes p→e+νν and p→μ+νν violate |Δ(B-L)| by two units. Using data from a 273.4 kt yr exposure of Super-Kamiokande a search for these decays yields a fit consistent with no signal. Accordingly, lower limits on the partial lifetimes of τp→e+νν1.7×10(32) years and τp→μ+νν2.2×10(32) years at a 90% confidence level are obtained. These limits can constrain Grand Unified Theories which allow for such processes.
Published: 2014

30. Search for Dinucleon Decay into Kaons in Super-Kamiokande

Author: T. Tsukamoto, A. T. Suzuki, T. Nakadaira, Makoto Sakuda, Masato Shiozawa, Y. Choi, Minoru Yoshida, B. S. Yang, T. Ishida, M. Ikeda, Haoxiong Zhang, S. Hazama, R. Terri, T. Hasegawa, T. Ishizuka, K. Sakashita, Y. Takenaga, C. McGrew, Yoshihiro Suzuki, M. Miura, N. Tamura, Takaaki Mori, Y. Totsuka, T. Wongjirad, J. L. Stone, Ken-ichiro Kobayashi, Koji Nakamura, Henry W. Sobel, K. Iyogi, Y. Takeuchi, B. Henning, M. Goldhaber, J. P. Cravens, Shigeki Tasaka, E. Thrane, N. Tanimoto, K. Ueshima, T. Kajita, A. Kibayashi, Shigetaka Moriyama, Yoshitaka Itow, T. Ishii, H. Kaji, J. S. Jang, Tsutomu Yokozawa, T. McLachlan, Hiroshi Watanabe, M. B. Smy, K. Connolly, Zishuo Yang, Kate Scholberg, Michael Litos, Atsushi Takeda, C. W. Walter, John Hill, Justin Albert, H. Okazawa, Y. Kuno, T. Kobayashi, G. Mitsuka, S. B. Kim, J. Y. Kim, R. J. Wilkes, S. Mino, Hirokazu Ishino, I. T. Lim, W. E. Keig, Masashi Yokoyama, David William Casper, M. Vagins, K. Kaneyuki, H. Nishino, H. Ogawa, Y. Shimizu, J. G. Learned, Yuichi Oyama, M. Dziomba, K. Nishijima, K. Nishikawa, Y. Kozuma, K. Abe, C. Ishihara, Masayuki Nakahata, S. Mine, Tsuyoshi Nakaya, M. Koshiba, S. Matsuno, Tetsuya S. Tanaka, Ko Okumura, Y. Hayato, L. R. Sulak, K. S. Ganezer, G. Lopez, Yusuke Koshio, Koh Ueno, A. Minamino, C. Yanagisawa, S. Nakayama, R. A. Wendell, J. Kameda, P. Mijakowski, E. Kearns, T. Sekiguchi, K. Bays, Hiroyuki Sekiya, Y. Fukuda, Y. Heng, Frédéric Dufour, Song Chen, T. Iida, H. Toyota, C. Regis, C. K. Jung, J. L. Raaf, D. Kielczewska, Y. Watanabe, Y. Yokosawa, Y. Obayashi, W. R. Kropp, and S. Yamada
Subjects: Physics, Particle physics, Bound state, General Physics and Astronomy, Atmospheric neutrino, Super-Kamiokande, Lower limit
Abstract: A search for the dinucleon decay $pp\ensuremath{\rightarrow}{K}^{+}{K}^{+}$ has been performed using $91.6\text{ }\text{ }\mathrm{kton}\ifmmode\cdot\else\textperiodcentered\fi{}\text{yr}$ data from Super-Kamiokande-I. This decay provides a sensitive probe of the $R$-parity-violating parameter ${{\ensuremath{\lambda}}_{112}}^{\ensuremath{'}\ensuremath{'}}$. A boosted decision tree analysis found no signal candidates in the data. The expected background was $0.28\ifmmode\pm\else\textpm\fi{}0.19$ atmospheric neutrino induced events and the estimated signal detection efficiency was $12.6%\ifmmode\pm\else\textpm\fi{}3.2%$. A lower limit of $1.7\ifmmode\times\else\texttimes\fi{}{10}^{32}\text{ }\text{ }\text{years}$ has been placed on the partial lifetime of the decay $^{16}\mathrm{O}\ensuremath{\rightarrow}^{14}\mathrm{C}{K}^{+}{K}^{+}$ at 90% C.L. A corresponding upper limit of $7.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}9}$ has been placed on the parameter ${{\ensuremath{\lambda}}_{112}}^{\ensuremath{'}\ensuremath{'}}$.
Published: 2014
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31. Search for Proton Decay throughp→ν¯K+in a Large Water Cherenkov Detector

Author: C. W. Walter, C. Mauger, M. Koshiba, A. Okada, T. Kobayashi, Y. Hatakeyama, K. Nakamura, John G. Learned, T. Futagami, M. R. Vagins, Ko Okumura, J. Hill, V. J. Stenger, S. Kasuga, Y. Fukuda, Yuichi Oyama, G. W. Sullivan, T. Hayakawa, Ken-ichiro Kobayashi, A. T. Suzuki, Masayuki Nakahata, F. Tsushima, Akira Hasegawa, Y. Takeuchi, K. Ishihara, David William Casper, Makoto Sakuda, Kunio Inoue, S. Mine, A. Sakai, Nobuyuki Sakurai, L. R. Price, J. Shirai, Yoshitaka Itow, K. Martens, M. Kirisawa, Hiroshi Ogawa, J. S. George, Y. Kanaya, K. Nishikawa, M. Koike, H. W. Sobel, Yasunari Suzuki, M. Nemoto, J. L. Stone, K. Higuchi, Shigeki Tasaka, E. Sharkey, J. Kameda, S. Hatakeyama, Osamu Sasaki, Takehisa Hasegawa, Y. Watanabe, L. R. Sulak, R. Sanford, S. Inaba, M. B. Smy, Takaaki Kajita, H. Ishino, J. A. Goodman, Kazumasa Miyano, D. Takemori, M. Takahata, Y. Kobayashi, E. Blaufuss, S. Nakayama, K. Kaneyuki, C. Saji, M. Etoh, W. Doki, H. Okazawa, K. S. Ganezer, W. Gajewski, Kate Scholberg, D. Kielczewska, Y. Totsuka, C. McGrew, M. Earl, T. Ishii, Alec Habig, H. Fujiyasu, S. Matsuno, M. Koga, Minoru Yoshida, L. Wai, Tomoyuki Maruyama, T. J. Haines, Y. Obayashi, M. Takita, M. Miura, Takashi Yamaguchi, B. Viren, M. Takahashi, W. R. Kropp, S. Yamada, M. D. Messier, S. Echigo, R. J. Wilkes, K. K. Young, C. Yanagisawa, K. Nishijima, R. W. Ellsworth, A. Kibayashi, Y. Nagashima, H. Takeuchi, B. K. Kim, W. E. Keig, M. L. Chen, M. Goldhaber, Y. Hayato, T. Iwamoto, Yusuke Koshio, S. B. Kim, A. L. Stachyra, M. Kohama, C. K. Jung, Masato Shiozawa, T. Barszczak, E. Kearns, A. Suzuki, R. Svoboda, and Junichi Kanzaki
Subjects: Nuclear physics, Physics, Particle physics, Proton, Proton decay, Cherenkov detector, law, High Energy Physics::Phenomenology, General Physics and Astronomy, High Energy Physics::Experiment, Neutrino, Lower limit, law.invention
Abstract: We present results of a search for proton decays, $p\ensuremath{\rightarrow}\overline{\ensuremath{\nu}}{K}^{+}$, using data from a $33\mathrm{kt}\ifmmode \dot{}\else \.{}\fi{}\mathrm{yr}$ exposure of the Super-Kamiokande detector. Two decay modes of the kaon, ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\nu}}_{\ensuremath{\mu}}$ and ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}$, were studied. The data were consistent with the background expected from atmospheric neutrinos; therefore a lower limit on the partial lifetime of the proton $\ensuremath{\tau}/B(p\ensuremath{\rightarrow}\overline{\ensuremath{\nu}}{K}^{+})$ was found to be $6.7\ifmmode\times\else\texttimes\fi{}{10}^{32}\mathrm{years}$ at $90%$ confidence level.
Published: 1999
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32. Comments

Author: M. Koshiba
Subjects: Nuclear and High Energy Physics, Atomic and Molecular Physics, and Optics
Published: 1999
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33. Search for Proton Decay viap→e+π0in a Large Water Cherenkov Detector

Author: A. T. Suzuki, Makoto Sakuda, John G. Learned, T. Futagami, K. Martens, T. Ishizuka, M. Ota, T. Hayakawa, G. W. Sullivan, Yuichi Oyama, Frederick Reines, R. W. Ellsworth, F. Tsushima, K. Ishihara, K. Nakamura, W. Gajewski, Kate Scholberg, T. Kobayashi, E. Ichihara, Y. Kobayashi, Ken-ichiro Kobayashi, H. W. Sobel, M. D. Messier, A. Sakai, B. Viren, M. L. Chen, Y. Nagashima, Junichi Kanzaki, Nobuyuki Sakurai, A. Kusano, T. J. Haines, R. A. Doyle, S. Echigo, H. Koga, Osamu Sasaki, Masayuki Nakahata, Y. Takeuchi, E. Kearns, A. Suzuki, J. Kameda, J. W. Flanagan, P. G. Halverson, W. R. Kropp, Minoru Yoshida, Takaaki Kajita, S. Hatakeyama, M. Goldhaber, Hiroshi Ogawa, R. Svoboda, Z. Conner, J. L. Stone, S. Yamada, K. Fujita, Y. Hayato, Takehisa Hasegawa, J. A. Goodman, Masaki Mori, K. K. Young, Y. Totsuka, T. Iwamoto, M. R. Vagins, M. Kohama, C. Yanagisawa, M. Miura, J. Hsu, C. K. Jung, M. Takahata, T. Kinebuchi, M. Earl, Yusuke Koshio, W. E. Keig, Masato Shiozawa, H. Okazawa, Yoshitaka Itow, J. Wilkes, L. R. Sulak, K. Nishijima, T. Barszczak, C. W. Walter, T. Ishii, J. Hill, A. Kibayashi, M. Takita, M. Oketa, Alec Habig, Tomoyuki Maruyama, D. Takemori, S. Matsuno, M. Koga, A. L. Stachyra, S. Kasuga, Y. Fukuda, C. Mauger, Takashi Yamaguchi, A. Okada, J. S. George, K. Nishikawa, Kazumasa Miyano, S. Nakayama, M. Nemoto, M. Etoh, K. S. Ganezer, S. B. Kim, Akira Hasegawa, L. R. Price, W. Doki, Shigeki Tasaka, E. Sharkey, M. Koshiba, Ko Okumura, Hirokazu Ishino, Kunio Inoue, Yasunari Suzuki, L. Wai, E. Blaufuss, K. Kaneyuki, C. Saji, C. McGrew, V. J. Stenger, Y. Kitaguchi, Y. Kanaya, Y. Watanabe, R. Sanford, and D. Kielczewska
Subjects: Physics, Particle decay, Particle physics, Proton, Cherenkov detector, law, Proton decay, General Physics and Astronomy, Neutrino, Lower limit, law.invention
Abstract: We have searched for proton decay via $p\ensuremath{\rightarrow}{e}^{+}{\ensuremath{\pi}}^{0}$ using data from a $25.5\mathrm{kton}\ifmmode \dot{}\else \.{}\fi{}\mathrm{yr}$ exposure of the Super-Kamiokande detector. We find no candidate events with an expected background induced by atmospheric neutrinos of 0.1 events. From these data, we set a lower limit on the partial lifetime of the proton $\ensuremath{\tau}{/B}_{p\ensuremath{\rightarrow}{e}^{+}{\ensuremath{\pi}}^{0}}$ to be $1.6\ifmmode\times\else\texttimes\fi{}{10}^{33}\mathrm{years}$ at a 90% confidence level.
Published: 1998
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34. Measurement of a small atmospheric ν/ν ratio

Author: Y. Fukuda, T. Hayakawa, E. Ichihara, K. Inoue, K. Ishihara, H. Ishino, Y. Itow, T. Kajita, J. Kameda, S. Kasuga, K. Kobayashi, Y. Kobayashi, Y. Koshio, K. Martens, M. Miura, M. Nakahata, S. Nakayama, A. Okada, M. Oketa, K. Okumura, M. Ota, N. Sakurai, M. Shiozawa, Y. Suzuki, Y. Takeuchi, Y. Totsuka, S. Yamada, M. Earl, A. Habig, J.T. Hong, E. Kearns, S.B. Kim, M. Masuzawa, M.D. Messier, K. Scholberg, J.L. Stone, L.R. Sulak, C.W. Walter, M. Goldhaber, T. Barszczak, W. Gajewski, P.G. Halverson, J. Hsu, W.R. Kropp, L.R. Price, F. Reines, H.W. Sobel, M.R. Vagins, K.S. Ganezer, W.E. Keig, R.W. Ellsworth, S. Tasaka, J.W. Flanagan, A. Kibayashi, J.G. Learned, S. Matsuno, V. Stenger, D. Takemori, T. Ishii, J. Kanzaki, T. Kobayashi, K. Nakamura, K. Nishikawa, Y. Oyama, A. Sakai, M. Sakuda, O. Sasaki, S. Echigo, M. Kohama, A.T. Suzuki, T.J. Haines, E. Blaufuss, R. Sanford, R. Svoboda, M.L. Chen, Z. Conner, J.A. Goodman, G.W. Sullivan, M. Mori, F. Goebel, J. Hill, C.K. Jung, C. Mauger, C. McGrew, E. Sharkey, B. Viren, C. Yanagisawa, W. Doki, T. Ishizuka, Y. Kitaguchi, H. Koga, K. Miyano, H. Okazawa, C. Saji, M. Takahata, A. Kusano, Y. Nagashima, M. Takita, T. Yamaguchi, M. Yoshida, M. Etoh, K. Fujita, A. Hasegawa, T. Hasegawa, S. Hatakeyama, T. Iwamoto, T. Kinebuchi, M. Koga, T. Maruyama, H. Ogawa, M. Saito, A. Suzuki, F. Tsushima, M. Koshiba, M. Nemoto, K. Nishijima, T. Futagami, Y. Hayato, Y. Kanaya, K. Kaneyuki, Y. Watanabe, D. Kielczewska, R. Doyle, J. George, A. Stachyra, L. Wai, J. Wilkes, and K. Young
Subjects: Momentum, Physics, Nuclear and High Energy Physics, Particle physics, High Energy Physics::Phenomenology, Monte Carlo method, Detector, Theoretical models, High Energy Physics::Experiment, Production (computer science), Atmospheric neutrino, Nuclear Experiment, Visible energy
Abstract: From an exposure of 25.5~kiloton-years of the Super-Kamiokande detector, 900 muon-like and 983 electron-like single-ring atmospheric neutrino interactions were detected with momentum $p_e > 100$ MeV/$c$, $p_\mu > 200$ MeV/$c$, and with visible energy less than 1.33 GeV. Using a detailed Monte Carlo simulation, the ratio $(\mu/e)_{DATA}/(\mu/e)_{MC}$ was measured to be $0.61 \pm 0.03(stat.) \pm 0.05(sys.)$, consistent with previous results from the Kamiokande, IMB and Soudan-2 experiments, and smaller than expected from theoretical models of atmospheric neutrino production.
Published: 1998
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35. Limits on sterile neutrino mixing using atmospheric neutrinos in Super-Kamiokande

Author: E. Richard, Atsushi Takeda, T. Tomura, J. S. Jang, H. Okazawa, A. Minamino, A. Himmel, John Hill, S. Moriyama, Yasuhiro Kishimoto, Masayuki Nakahata, A. T. Suzuki, M. Koshiba, J. F. Martin, K. Martens, Y. Takeuchi, T. Nakadaira, W. E. Keig, Y. Nishimura, S. Matsuno, Makoto Sakuda, Yuichi Oyama, K. Sakashita, C. Yanagisawa, Song Chen, K. P. Lee, J. L. Raaf, N. Hong, Yoshitaka Itow, E. Kearns, H. W. Sobel, Yuuki Nakano, T. Tsukamoto, M. Miura, R. Yamaguchi, K. Abe, Masashi Yokoyama, Joshua Hignight, T. McLachlan, K. Nishijima, Yoshihiro Suzuki, K. Choi, Pablo Fernandez, Takaaki Mori, M. Goldhaber, Yejin Zhang, T. Ishida, T. Ishizuka, C. W. Walter, I. Kametani, P. de Perio, T. Yano, Tsuyoshi Nakaya, Y. Totsuka, Susumu Takahashi, C. K. Jung, B. L. Hartfiel, S. Berkman, T. Akiri, J. L. Stone, Hiroyuki Sekiya, A. L. Renshaw, K. Connolly, Y. Fukuda, T. Wongjirad, Kimihiro Okumura, Masato Shiozawa, Y. Choi, Takaaki Kajita, K. Kaneyuki, Shigeki Tasaka, K. Ieki, M. Ikeda, M. J. Wilking, Y. Haga, R. J. Wilkes, P. Weatherly, T. Sekiguchi, S. B. Kim, J. Y. Kim, H.A. Tanaka, T. Ishii, R. Tacik, C. Bronner, J. G. Learned, S. N. Smith, W. R. Kropp, S. Tobayama, K. Nakamura, T. J. Irvine, K. Tateishi, Yusuke Suda, H. K. Tanaka, J. Imber, M. B. Smy, Ll. Marti, A. Konaka, K. Huang, A. Kibayashi, Yusuke Koshio, M. R. Vagins, A. Murakami, Seiko Hirota, T. Kikawa, G. Mitsuka, I. T. Lim, Y. Hayato, Y. Kuno, R. A. Wendell, L. Labarga, T. Kobayashi, G. Carminati, K. Iyogi, S. Mine, J. Gustafson, Takehisa Hasegawa, Kate Scholberg, Hirokazu Ishino, K. S. Ganezer, S. Nakayama, J. Kameda, P. Mijakowski, Kazuhiro Suzuki, V. Takhistov, L. R. Sulak, Koh Ueno, T. Yokozawa, and UAM. Departamento de Física Teórica
Subjects: Nuclear and High Energy Physics, Particle physics, Sterile neutrino, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, 010306 general physics, Neutrino oscillation, Mixing (physics), Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Física, Solar neutrino problem, High Energy Physics - Phenomenology, High Energy Physics::Experiment, Neutrino, Atmospheric neutrino, Super-Kamiokande
Abstract: Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAM, We present limits on sterile neutrino mixing using 4,438 live-days of atmospheric neutrino data from the Super-Kamiokande experiment. We search for fast oscillations driven by an eV2-scale mass splitting and for oscillations into sterile neutrinos instead of tau neutrinos at the atmospheric mass splitting. When performing both of these searches we assume that the sterile mass splitting is large, allowing sin2(Δm2L/4E) to be approximated as 0.5, and we assume that there is no mixing between electron neutrinos and sterile neutrinos (|Ue4|2=0). No evidence of sterile oscillations is seen and we limit |Uμ4|2 to less than 0.041 and |Uτ4|2 to less than 0.18 for Δm2>0.1eV2 at the 90% C.L. in a 3+1 framework. The approximations that can be made with atmospheric neutrinos allow these limits to be easily applied to 3+N models, and we provide our results in a generic format to allow comparisons with other sterile neutrino models, The authors gratefully acknowledge the cooperation of the Kamioka Mining and Smelting Company. Super-K has been built and operated from funds provided by the Japanese Ministry of Education, Culture, Sports, Science and Technology, the U.S. Department of Energy, and the U.S. National Science Foundation. This work was partially supported by the Research Foundation of Korea (BK21 and KNRC), the Korean Ministry of Science and Technology, the National Science Foundation of China, the European Union FP7 (DS laguna-lbno PN- 284518 and ITN invisibles GA-2011-289442) the National Science and Engineering Research Council (NSERC) of Canada, and the Scinet and Westgrid consortia of Compute Canada
Published: 2014
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36. Large-scale anisotropy of the cosmic-ray muon flux in Kamiokande

Author: Yuichi Oyama, M. Takita, S. Kasuga, Y. Fukuda, A. T. Suzuki, Y. Totsuka, Akito Sakai, H. Okazawa, M. Koshiba, S. Hatakeyama, K. Kihara, T. Kumita, Takayuki Suzuki, T. Horiuchi, E. Ichihara, Yasunari Suzuki, K. Matsumoto, Y. Takeuchi, T. Tomoeda, K. S. Hirata, Ko Okumura, Masayuki Nakahata, T. Yamaguchi, J. Suzuki, Y. Hayato, T. Hara, T. Suda, C. Kato, T. Ishizuka, Yusuke Koshio, Takaaki Kajita, H. Ishino, Kunio Inoue, S. Yasue, Masaki Mori, Toru Tanimori, Kyoshi Nishijima, K. Ishihara, M. Koga, K. Fujita, K. Kaneyuki, K. Nishikawa, S. Miyamoto, Kazuoki Munakata, Kazumasa Miyano, K. Nakamura, T. Hayakawa, S. Joukou, Shigeki Tasaka, T. Kiuchi, Masato Shiozawa, A. Suzuki, Tomoyuki Maruyama, Y. Nagashima, and S. Mori
Subjects: Physics, Astrophysics and Astronomy, Nuclear and High Energy Physics, Particle physics, Muon, Physics::Instrumentation and Detectors, Cherenkov detector, Astrophysics::High Energy Astrophysical Phenomena, Isotropy, Astrophysics::Instrumentation and Methods for Astrophysics, Scale (descriptive set theory), Cosmic ray, Astrophysics, law.invention, Amplitude, law, High Energy Physics::Experiment, Ultra-high-energy cosmic ray, Anisotropy
Abstract: The large-scale anisotropy of cosmic-ray primaries in the celestial coordinate was studied using cosmic-ray muons recorded in a large water Cherenkov detector, Kamiokande. The right-ascension distribution of the muon arrival directions deviated from an isotropic distribution with a 2.8 standard deviation, and agreed well with the first harmonics with an amplitude of $(5.6\ifmmode\pm\else\textpm\fi{}1.9)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ and a phase of $8.0\ifmmode^\circ\else\textdegree\fi{}\ifmmode\pm\else\textpm\fi{}19.1\ifmmode^\circ\else\textdegree\fi{}$. This is the deepest underground observation of the large-scale anisotropy of cosmic rays, and agrees with observations with other underground experiments and extensive air-shower array experiments.
Published: 1997
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37. Effects of extracellular ATP and adenosine on different thymocyte subsets: possible role of ATP-gated channels and G protein-coupled purinergic receptor

Author: S G Apasov, M Koshiba, T M Chused, and M V Sitkovsky
Subjects: Immunology, Immunology and Allergy
Abstract: To explore the possible role of purinergic receptors in thymocyte development and in pathogenesis of adenosine deaminase SCID, we studied effects of extracellular adenosine triphosphate (ATP(ext)) and adenosine on TCR- and steroid hormone-triggered processes in mouse thymocytes. Reverse transcriptase-PCR analysis confirms the mRNA expression of several types of purinergic receptors, while the functioning of ATP receptors in thymocytes is reflected by ATP(ext)-induced intracellular calcium increases and by thymocyte subset-specific sensitivity to the effects of ATP(ext) and adenosine. Only ATP(ext), but not the ATP catabolites, adenosine, dexamethasone, or TCR cross-linking, was efficient in triggering rapid protein synthesis independent lysis of CD4+8- thymocytes and peripheral CD4+ T cells. In contrast, extracellular adenosine specifically induced the apoptosis of CD4+8+ thymocytes. ATP(ext) also induced a slower process of DNA fragmentation and protein synthesis-dependent apoptosis in all thymocyte subsets. ATP(ext) had an additive effect with TCR cross-linking in the induction of thymocyte death, but, unexpectedly, the effects of ATP(ext) at high concentration were antagonistic to steroid-induced apoptosis. Described here, the properties of ATP(ext) and adenosine are consistent with their involvement in the regulation of T cell development due to differential expression and signaling through purinergic receptors in different thymocyte subsets. The possible role of purinergic receptor signaling in T cell differentiation and adenosine deaminase SCID is discussed.
Published: 1997
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38. A vector finite element formulation for general bi-anisotropic waveguides

Author: S. Maruyama and M. Koshiba
Subjects: Physics, business.industry, Wave propagation, Mathematical analysis, Physics::Optics, Edge (geometry), Boundary knot method, Finite element method, Electronic, Optical and Magnetic Materials, Optics, Boundary value problem, Electrical and Electronic Engineering, Element (category theory), business, Anisotropy, Extended finite element method
Abstract: A numerical approach based on the vector finite element method is described for the analysis of most general bi-anisotropic waveguides. In this approach hybrid edge/nodal triangular elements are used, and therefore, the boundary condition on each element side is automatically satisfied. To confirm the validity and usefulness of the present formulation, numerical examples are shown for metal ferrite-chiral circular waveguides and ferrite-chiral circular waveguides.
Published: 1997
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39. Search for nucleon decay via n→ν[over ¯]π0 and p→ν[over ¯]π+ in Super-Kamiokande

Author: K, Abe, Y, Hayato, T, Iida, K, Iyogi, J, Kameda, Y, Koshio, Y, Kozuma, Ll, Marti, M, Miura, S, Moriyama, M, Nakahata, S, Nakayama, Y, Obayashi, H, Sekiya, M, Shiozawa, Y, Suzuki, A, Takeda, Y, Takenaga, K, Ueno, K, Ueshima, S, Yamada, T, Yokozawa, C, Ishihara, H, Kaji, T, Kajita, K, Kaneyuki, K P, Lee, T, McLachlan, K, Okumura, Y, Shimizu, N, Tanimoto, L, Labarga, E, Kearns, M, Litos, J L, Raaf, J L, Stone, L R, Sulak, M, Goldhaber, K, Bays, W R, Kropp, S, Mine, C, Regis, A, Renshaw, M B, Smy, H W, Sobel, K S, Ganezer, J, Hill, W E, Keig, J S, Jang, J Y, Kim, I T, Lim, J B, Albert, K, Scholberg, C W, Walter, R, Wendell, T M, Wongjirad, T, Ishizuka, S, Tasaka, J G, Learned, S, Matsuno, S N, Smith, T, Hasegawa, T, Ishida, T, Ishii, T, Kobayashi, T, Nakadaira, K, Nakamura, K, Nishikawa, Y, Oyama, K, Sakashita, T, Sekiguchi, T, Tsukamoto, A T, Suzuki, Y, Takeuchi, M, Ikeda, A, Minamino, T, Nakaya, Y, Fukuda, Y, Itow, G, Mitsuka, T, Tanaka, C K, Jung, G D, Lopez, I, Taylor, C, Yanagisawa, H, Ishino, A, Kibayashi, S, Mino, T, Mori, M, Sakuda, H, Toyota, Y, Kuno, M, Yoshida, S B, Kim, B S, Yang, H, Okazawa, Y, Choi, K, Nishijima, M, Koshiba, M, Yokoyama, Y, Totsuka, K, Martens, J, Schuemann, M R, Vagins, S, Chen, Y, Heng, Z, Yang, H, Zhang, D, Kielczewska, P, Mijakowski, K, Connolly, M, Dziomba, E, Thrane, and R J, Wilkes
Abstract: We present the results of searches for nucleon decay via n→ν[over ¯]π0 and p→ν[over ¯]π+ using data from a combined 172.8 kt·yr exposure of Super-Kamiokande-I,-II, and-III. We set lower limits on the partial lifetime for each of these modes: τn→ν[over ¯]π01.1×10(33) years and τp→ν[over ¯]π+3.9×10(32) years at a 90% confidence level.
Published: 2013

40. Study of neutron background in the atmospheric neutrino sample in Kamiokande

Author: H. Okazawa, Tomoyuki Maruyama, Masaki Mori, S. Kasuga, Y. Fukuda, Y. Totsuka, A. Suzuki, A.T. Suzuki, Toru Tanimori, K. Ishihara, Y. Takeuchi, K. Nishikawa, E. Ichihara, K. S. Hirata, J. Suzuki, Masato Shiozawa, T. Hara, T. Tomoeda, T. Ishizuka, K. Kaneyuki, M. Koshiba, Takaaki Kajita, H. Ishino, A. Sakai, Yuichi Oyama, Masayuki Nakahata, T. Suda, Ko Okumura, Kazumasa Miyano, Kunio Matsumoto, K. Nakamura, Y. Hayato, Kunio Inoue, S. Joukou, K. Fujita, Shigeki Tasaka, Kyoshi Nishijima, T. Hayakawa, Toshiharu Suzuki, Yusuke Koshio, S. Hatakeyama, K. Kihara, T. Kumita, T. Horiuchi, Y. Nagashima, M. Koga, Yasunari Suzuki, M. Takita, Takashi Yamaguchi, and S. Miyamoto
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Neutrino detector, Astrophysics::High Energy Astrophysical Phenomena, Neutron, Atmospheric neutrino, Neutrino, Nuclear Experiment, Neutrino oscillation, Neutron contamination, Sample (graphics)
Abstract: Neutron background in the atmospheric neutrino sample was studied based on the vertex position distribution of the fully contained π 0 events. No evidence for the background contamination was observed. The neutron contamination in the sub-GeV e-like sample was less than 1.2% at 90% C.L.
Published: 1996
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41. First Indication of Terrestrial Matter Effects on Solar Neutrino Oscillation

Author: Hirokazu Ishino, Kimihiro Okumura, S. N. Smith, A. T. Suzuki, J. F. Martin, T. Nakadaira, John Hill, J. G. Learned, K. Martens, K. Sakashita, Shigeki Tasaka, T. J. Irvine, H. A. Tanaka, Makoto Sakuda, W. R. Kropp, Y. Nishimura, A. Minamino, S. Tobayama, K. Nakamura, S. Berkman, L. R. Sulak, P. de Perio, T. Yano, H. W. Sobel, N. Hong, A. L. Renshaw, W. E. Keig, J. S. Jang, Song Chen, Yejin Zhang, Joshua Hignight, K. Iyogi, A. Himmel, M. B. Smy, Koh Ueno, K. S. Ganezer, Y. Totsuka, Susumu Takahashi, S. Mine, M. J. Wilking, K. Choi, Takaaki Mori, T. Wongjirad, C. W. Walter, M. Koshiba, R. Tacik, K. Huang, K. Ieki, A. Kibayashi, Yuichi Oyama, Atsushi Takeda, J. L. Stone, Yasuhiro Kishimoto, T. Yokozawa, Takehisa Hasegawa, T. Tomura, T. Ishii, R. J. Wilkes, Yuuki Nakano, K. Abe, J. L. Raaf, Hiroyuki Sekiya, Yoshitaka Itow, H. Okazawa, Y. Takenaga, M. Miura, Y. Hayato, Y. Fukuda, A. Konaka, R. A. Wendell, M. R. Vagins, Y. Takeuchi, J. Imber, T. Akiri, Kate Scholberg, T. McLachlan, E. Kearns, Yusuke Koshio, Masashi Yokoyama, Ll. Marti, S. Matsuno, J. Kameda, G. Mitsuka, G. Carminati, T. Ishizuka, Tsuyoshi Nakaya, I. T. Lim, C. K. Jung, M. Ikeda, Masato Shiozawa, Y. Choi, P. Mijakowski, C. Bronner, M. Goldhabar, Kazuhiro Suzuki, C. Yanagisawa, S. Nakayama, Seiko Hirota, T. Kikawa, K. P. Lee, K. Kaneyuki, S. B. Kim, J. Y. Kim, T. Sekiguchi, K. Bays, Y. Kuno, Yasunari Suzuki, K. Nishijima, S. Moriyama, Masayuki Nakahata, T. Tsukamoto, T. Ishida, Takaaki Kajita, L. Labarga, and T. Kobayashi
Subjects: Elastic scattering, Physics, Solar neutrino, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, General Physics and Astronomy, FOS: Physical sciences, Solar neutrino problem, High Energy Physics - Experiment, Nuclear physics, Cosmic neutrino background, High Energy Physics - Experiment (hep-ex), Neutrino detector, Measurements of neutrino speed, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Neutrino, Neutrino oscillation
Abstract: We report an indication that the elastic scattering rate of solar $^8$B neutrinos with electrons in the Super-Kamiokande detector is larger when the neutrinos pass through the Earth during nighttime. We determine the day/night asymmetry, defined as the difference of the average day rate and average night rate divided by the average of those two rates, to be $(-3.2\pm1.1(\text{stat})\pm0.5(\text{syst}))\%$, which deviates from zero by 2.7 $\sigma$. Since the elastic scattering process is mostly sensitive to electron-flavored solar neutrinos, a non-zero day/night asymmetry implies that the flavor oscillations of solar neutrinos are affected by the presence of matter within the neutrinos' flight path. Super-Kamiokande's day/night asymmetry is consistent with neutrino oscillations for $4\times10^{-5}$eV$^2\leq\Delta m^2_{21}\leq7\times10^{-5}$eV$^2$ and large mixing values of $\theta_{12}$, at the $68\%$ C.L., Comment: 6 pages, 4 figures
Published: 2013
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42. Calibration of the Super-Kamiokande Detector

Author: H.A. Tanaka, Hirokazu Ishino, Justin Albert, Y. Kuno, J. Imber, K. P. Lee, T. Akiri, P. de Perio, Y. Takeuchi, H. Kaji, M. R. Vagins, Ll. Marti, A. T. Suzuki, Song Chen, K. Martens, Minoru Otani, T. Iida, R. Yamaguchi, A. L. Renshaw, J. F. Martin, Yasuhiro Nishimura, A. Murakami, S. B. Kim, T. Nakadaira, G. Mitsuka, Takaaki Kajita, T. J. Irvine, J. Y. Kim, I. T. Lim, Makoto Sakuda, N. Hong, Kimihiro Okumura, T. Yokozawa, C. W. Walter, S. Mine, K. Huang, A. Kibayashi, S. Moriyama, Y. Takenaga, M. Miura, Joshua Hignight, Yoshihiro Suzuki, J. Kameda, A. Minamino, S. Berkman, Masayuki Nakahata, M. J. Wilking, S. N. Smith, M. Miyake, R. Tacik, P. Mijakowski, J. S. Jang, Y. Totsuka, Susumu Takahashi, Takehisa Hasegawa, Yuichi Oyama, Kazuhiro Suzuki, Hidetoshi Kubo, Hiroyuki Sekiya, T. Wongjirad, K. Connolly, Y. Fukuda, Takaaki Mori, John G. Learned, H. Sui, T. Yano, K. Abe, Yusuke Koshio, J. L. Stone, M. Dziomba, K. S. Ganezer, L. Labarga, T. Kobayashi, H. K. Tanaka, T. Ishii, T. Tsukamoto, G. Carminati, J. L. Raaf, Zishuo Yang, Kate Scholberg, H. Zhang, B. S. Yang, H. W. Sobel, Yoshitaka Itow, M. Koshiba, T. Ishida, S. Nakayama, L. R. Sulak, I. Taylor, Yuuki Nakano, Atsushi Takeda, M. B. Smy, Y. Zhenwei, Y. Obayashi, Koh Ueno, W. R. Kropp, S. Tobayama, K. Nakamura, Y. Idehara, K. Nishikawa, Yasuhiro Kishimoto, Shigeki Tasaka, Y. Heng, T. McLachlan, A. Konaka, T. Tomura, H. Okazawa, John Hill, K. Sakashita, S. Matsuno, M. Goldhaber, W. E. Keig, K. Choi, K. Iyogi, R. A. Wendell, Y. Hayato, A. Himmel, T. Kikawa, C. K. Jung, M. Ikeda, Masato Shiozawa, Y. Choi, K. Kaneyuki, T. Sekiguchi, K. Bays, E. Kearns, Masashi Yokoyama, C. Yanagisawa, T. Ishizuka, Tsuyoshi Nakaya, K. Nishijima, K. Ieki, and R. J. Wilkes
Subjects: Physics, Nuclear and High Energy Physics, Photomultiplier, Photon, Physics - Instrumentation and Detectors, business.industry, Physics::Instrumentation and Detectors, Detector, Monte Carlo method, FOS: Physical sciences, Context (language use), Instrumentation and Detectors (physics.ins-det), High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Optics, Calibration, Quantum efficiency, business, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation, Instrumentation and Methods for Astrophysics (astro-ph.IM), Energy (signal processing)
Abstract: Procedures and results on hardware level detector calibration in Super-Kamiokande (SK) are presented in this paper. In particular, we report improvements made in our calibration methods for the experimental phase IV in which new readout electronics have been operating since 2008. The topics are separated into two parts. The first part describes the determination of constants needed to interpret the digitized output of our electronics so that we can obtain physical numbers such as photon counts and their arrival times for each photomultiplier tube (PMT). In this context, we developed an in-situ procedure to determine high-voltage settings for PMTs in large detectors like SK, as well as a new method for measuring PMT quantum efficiency and gain in such a detector. The second part describes the modeling of the detector in our Monte Carlo simulation, including in particular the optical properties of its water target and their variability over time. Detailed studies on the water quality are also presented. As a result of this work, we achieved a precision sufficient for physics analysis over a wide energy range (from a few MeV to above a TeV). For example, the charge determination was understood at the 1% level, and the timing resolution was 2.1 nsec at the one-photoelectron charge level and 0.5 nsec at the 100-photoelectron charge level., Comment: 75 pages, 35 figures
Published: 2013
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43. Unique spatial solitons in Gunn‐instability semiconductors

Author: M. Koshiba and K. Hayata
Subjects: Physics, Beam diameter, Condensed matter physics, business.industry, General Physics and Astronomy, Soliton (optics), Electromagnetic radiation, Condensed Matter::Materials Science, Nonlinear Sciences::Exactly Solvable and Integrable Systems, Amplitude, Semiconductor, Electric field, Charge carrier, business, Nonlinear Sciences::Pattern Formation and Solitons, Gunn diode
Abstract: A novel and unique principle for generating spatial solitons is presented, which is based on a balance between the diffusion of carriers and their nonlinear velocity‐field characteristic in a compound semiconductor such as GaAs. In striking contrast to conventional solitons for electromagnetic radiation, the present soliton is supported solely by the longitudinal electric field. The soliton parameters such as the peak amplitude and the beam width can be controlled with varying the concentration of ionized donors.A novel and unique principle for generating spatial solitons is presented, which is based on a balance between the diffusion of carriers and their nonlinear velocity‐field characteristic in a compound semiconductor such as GaAs. In striking contrast to conventional solitons for electromagnetic radiation, the present soliton is supported solely by the longitudinal electric field. The soliton parameters such as the peak amplitude and the beam width can be controlled with varying the concentration of ionized donors.
Published: 1995
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44. Dynamic stabilization of self-trapped solitary waves in cubic nonlinear media: A route to multidimensional solitons

Author: Y. Uehira, M. Koshiba, and K. Hayata
Subjects: Physics, Nonlinear system, Classical mechanics, Photon, Transverse dimension, Self-phase modulation, Atomic and Molecular Physics, and Optics, Expression (mathematics), Parametric statistics
Abstract: We show numerically that, contrary to what has been believed so far, multidimensional quasisolitons can propagate in cubic nonlinear media. To avoid the blowup along the propagation axis, we take advantage of cross-phase modulations and two-wave parametric interactions under a balanced photon exchange. A compact analytical expression for the new solitons with arbitrary transverse dimension is derived through self-consistent-field approximation.
Published: 1995
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45. Behavior of the first higher-order modes of a circular core optical fiber whose core cross-section changes into an ellipse

Author: M. Koshiba and M. Eguchi
Subjects: Physics, Optical fiber, Birefringence, business.industry, Degenerate energy levels, Ellipse, Atomic and Molecular Physics, and Optics, law.invention, Core (optical fiber), Cross section (geometry), Optics, law, Atomic physics, business, Refractive index, Order of magnitude
Abstract: The vector finite element method is used for investigating the behavior of a set of the first higher-order, four-fold degenerate modes (TE/sub 01/, TM/sub 01/, and two-fold degenerate HE/sub 21/ modes) of a circular core optical fiber whose core cross-section changes into an ellipse. It is found that the TE/sub 01/ mode becomes the first higher-order mode polarized along the minor axis, E/sub 21//sup y/ mode, in a dual-mode region. The remaining three modes become, respectively, the first higher-order mode polarized along the major axis, E/sub 21//sup x/ mode, and the second higher-order modes polarized along the major and minor axes, E/sub 12//sup x/ and E/sub 12//sup y/ modes, in the order of magnitude of the effective index. It is also found that the effective index of the E/sub 21//sup x/ mode is smaller than that of the E/sub 21//sup y/ mode in a small ellipticity region. >
Published: 1995
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46. Search for proton decay viap→μ+K0in Super-Kamiokande I, II, and III

Author: M. Koshiba, J. S. Jang, Takaaki Mori, Ko Okumura, E. Kearns, K. Connolly, J. L. Stone, K. Choi, Y. Totsuka, K. P. Lee, J. G. Learned, Masashi Yokoyama, Yusuke Koshio, T. Wongjirad, Ke. Abe, H. W. Sobel, A. T. Suzuki, K. Iyogi, T. Tsukamoto, L. Labarga, H. Sui, T. Nakadaira, T. Ishizuka, Tsuyoshi Nakaya, W. R. Kropp, K. Nishijima, S. Mine, T. Kobayashi, Makoto Sakuda, T. Ishii, Shigeki Tasaka, K. Nishikawa, Song Chen, J. C. Hill, H. Zhang, C. K. Jung, T. Ishida, Y. Takenaga, M. Miura, M. Ikeda, K. Kaneyuki, Masato Shiozawa, Y. Choi, K. S. Ganezer, Takehisa Hasegawa, W. E. Keig, C. Regis, Hidetoshi Kubo, T. Sekiguchi, A. Kibayashi, S. B. Kim, J. L. Raaf, Hirokazu Ishino, Yoshitaka Itow, K. Bays, J. Y. Kim, G. Carminati, S. N. Smith, H. Okazawa, Atsushi Takeda, K. Nakamura, H. Kaji, Joshua Hignight, A. Minamino, Yasunari Suzuki, C. W. Walter, T. McLachlan, Y. Obayashi, Ian Taylor, K. Ieki, R. J. Wilkes, S. Moriyama, Masayuki Nakahata, S. Matsuno, J. Takeuchi, Y. Hayato, K. Sakashita, Zishuo Yang, Justin Albert, Kate Scholberg, Y. Kuno, Hiroyuki Sekiya, Y. Fukuda, C. Yanagisawa, M. Goldhaber, M. Dziomba, Y. Takeuchi, T. Kajita, M. R. Vagins, A. Murakami, S. Nakayama, G. Mitsuka, I. T. Lim, R. A. Wendell, J. Kameda, P. Mijakowski, Kalen Martens, L. R. Sulak, M. B. Smy, Koh Ueno, T. Yokozawa, J. Imber, Ll. Marti, M. Miyake, Yuichi Oyama, and A. L. Renshaw
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Proton, Proton decay, Atmospheric neutrino, Super-Kamiokande, Lower limit
Abstract: We have searched for proton into muon plus neutral kaon using data from a 91.7 kiloton-year exposure of Super-Kamiokande-I, a 49.2 kiloton-year exposure of Super-Kamiokande-II, and a 31.9 kiloton-year exposure of Super-Kamiokande-III. The number of candidate events in the data was consistent with the atmospheric neutrino background expectation and no evidence for proton decay in this mode was found. We set a partial lifetime lower limit of 1.6x10^33 years at the 90% confidence level.
Published: 2012
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47. Search for nucleon decay into charged antilepton plus meson in Super-Kamiokande I and II

Author: Atsushi Takeda, A. T. Suzuki, Y. Totsuka, T. Nakadaira, T. Tsukamoto, H. W. Sobel, Makoto Sakuda, C. W. Walter, Takaaki Kajita, G. D. Lopez, C. Yanagisawa, J. Liu, Yoshitaka Itow, B. S. Yang, Y. Idehara, J. G. Learned, T. Ishida, G. Mitsuka, Y. Furuse, N. Tanimoto, Shigeki Tasaka, Frédéric Dufour, K. Nishikawa, K. Nishijima, C. McGrew, N. Tamura, K. Ueshima, K. Sakashita, Hiroyuki Sekiya, Y. Hayato, John Hill, J. P. Cravens, Y. Fukuda, J. L. Stone, W. E. Keig, K. Kaneyuki, Shaomin Chen, Minoru Yoshida, S. Moriyama, R. J. Wilkes, M. Koshiba, T. Sekiguchi, Yuichi Oyama, M. Goldhaber, L. R. Sulak, Tetsuya S. Tanaka, Ko Okumura, Y. Takeuchi, K. Bays, Masayuki Nakahata, H. Nishino, E. Kearns, Y. Takenaga, M. Miura, Masashi Yokoyama, M. B. Smy, Yasunari Suzuki, K. Abe, H. Kaji, M. R. Vagins, J. S. Jang, Koh Ueno, Hiroshi Watanabe, Michael Litos, H. Okazawa, S. Mine, K. Connolly, T. Ishizuka, M. Ikeda, Yusuke Koshio, T. Ishii, T. Kobayashi, Tsuyoshi Nakaya, I. T. Lim, A. Minamino, C. K. Jung, Masato Shiozawa, Y. Choi, Takehisa Hasegawa, C. Ishihara, Haoxiong Zhang, S. Hazama, S. B. Kim, S. Matsuno, E. Thrane, J. Y. Kim, Justin Albert, Y. Kuno, Zishuo Yang, Kate Scholberg, C. Regis, J. L. Raaf, D. Kielczewska, Y. Watanabe, Y. Yokosawa, Y. Obayashi, W. R. Kropp, K. Nakamura, S. Yamada, I. Higuchi, Y. Heng, H. Seo, T. Iida, J. Kameda, S. Nakayama, R. A. Wendell, and K. S. Ganezer
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, FOS: Physical sciences, 01 natural sciences, 7. Clean energy, Omega, High Energy Physics - Experiment, 3. Good health, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, High Energy Physics::Experiment, Atmospheric neutrino, 010306 general physics, Nucleon, Super-Kamiokande
Abstract: Searches for a nucleon decay into a charged anti-lepton (e^+ or {\mu}^+) plus a light meson ({\pi}^0, {\pi}^-, {\eta}, {\rho}^0, {\rho}^-, {\omega}) were performed using the Super-Kamiokande I and II data. Twelve nucleon decay modes were searched for. The total exposure is 140.9 kiloton \cdot years, which includes a 91.7 kiloton \cdot year exposure (1489.2 live days) of Super-Kamiokande-I and a 49.2 kiloton \cdot year exposure (798.6 live days) of Super-Kamiokande-II. The number of candidate events in the data was consistent with the atmospheric neutrino background expectation. No significant evidence for a nucleon decay was observed in the data. Thus, lower limits on the nucleon partial lifetime at 90% confidence level were obtained. The limits range from 3.6 \times 10^31 to 8.2 \times 10^33 years, depending on the decay modes., Comment: 25 pages, 18 figures
Published: 2012
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48. Supernova relic neutrino search at super-Kamiokande

Author: P. Mijakowski, K. Martens, G. Mitsuka, Michael Litos, Yoshitaka Itow, K. Ueshima, T. Tanaka, Y. Takeuchi, J. G. Learned, Song Chen, L. Marti, Y. Takenaga, Joshua Hignight, Yoshihiro Suzuki, M. Dziomba, S. Nakayama, R. A. Wendell, M. Miura, L. R. Sulak, J. Imber, A. T. Suzuki, T. McLachlan, C. Regis, Y. Totsuka, T. Nakadaira, M. B. Smy, Hirokazu Ishino, Koh Ueno, T. Wongjirad, J. L. Raaf, A. L. Renshaw, J. S. Jang, Makoto Sakuda, Atsushi Takeda, T. Iida, K. Connolly, H. W. Sobel, Y. Heng, C. W. Walter, H. Toyota, A. Minamino, I. Taylor, A. Kibayashi, K. S. Ganezer, M. Miyake, T. Tsukamoto, Yuichi Oyama, Hiroyuki Sekiya, John Hill, M. R. Vagins, Y. Fukuda, S. Moriyama, Masayuki Nakahata, K. Abe, T. Yokozawa, Y. Obayashi, K. Sakashita, A. Murakami, W. E. Keig, B. S. Yang, T. Ishida, I. T. Lim, K. P. Lee, H. Kaji, K. Nishikawa, T. Ishii, C. Yanagisawa, M. Koshiba, Ko Okumura, E. Kearns, Kodai Matsuoka, K. Nishijima, W. R. Kropp, Masashi Yokoyama, S. Yamada, T. Ishizuka, Tsuyoshi Nakaya, R. J. Wilkes, L. Labarga, T. Kobayashi, C. K. Jung, H. Okazawa, M. Ikeda, Masato Shiozawa, Y. Choi, Takaaki Kajita, Zishuo Yang, Kate Scholberg, Haoxiong Zhang, S. Matsuno, Shigeki Tasaka, S. Mine, Takehisa Hasegawa, Justin Albert, Y. Kuno, S. Mino, K. Iyogi, S. N. Smith, Takaaki Mori, J. L. Stone, K. Kaneyuki, Koji Nakamura, T. Sekiguchi, K. Bays, Y. Hayato, Sunghoon Cho, Yusuke Koshio, S. B. Kim, J. Y. Kim, J. Kameda, and UAM. Departamento de Física Teórica
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, FOS: Physical sciences, Física, Lower energy, Positron energy, High Energy Physics - Experiment, Nuclear physics, Supernova, High Energy Physics - Experiment (hep-ex), High Energy Physics::Experiment, Sensitivity (control systems), Neutrino, Super-Kamiokande
Abstract: Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAM, A new Super-Kamiokande search for supernova relic neutrinos was conducted using 2853 live days of data. Sensitivity is now greatly improved compared to the 2003 Super-Kamiokande result, which placed a flux limit near many theoretical predictions. This more detailed analysis includes a variety of improvements such as increased efficiency, a lower energy threshold, and an expanded data set. New combined upper limits on supernova relic neutrino flux are between 2.8 and 3.1ν̄e cm-2 s-1 > 16 MeV total positron energy (17.3 MeV Eν), The Super-Kamiokande experiment has been built and operated from funding by the Japanese Ministry of Education, Culture, Sports, Science and Technology, the United States Department of Energy, and the U.S. National Science Foundation. Some of us have been supported by funds from the Korean Research Foundation (BK21), the National Research Foundation of Korea (NRF- 20110024009), the Japan Society for the Promotion of Science, and the National Natural Science Foundation of China (Grants No. 10875062 and No. 10911140109)
Published: 2012

49. Atmospheric ratio in the multi-GeV energy range

Author: H. Miyata, J. Suzuki, Y. Takeuchi, Kazumasa Miyano, Masaki Mori, K. Nakamura, Y. Nagashima, Akito Sakai, Atsumu Suzuki, E. W. Beier, Masato Shiozawa, Soo-Bong Kim, S. Kasuga, Y. Fukuda, A. T. Suzuki, K. S. Hirata, Toru Tanimori, T. Hara, K. Kaneyuki, E. D. Frank, M. Koga, Takaaki Kajita, M. Koshiba, R. Van Berg, H. Okazawa, T. Ishizuka, Weiya Zhang, S. Joukou, Shigeki Tasaka, Takanori Ishida, Kunio Inoue, K. Kihara, T. Kumita, H. Takei, Yasunari Suzuki, F. M. Newcomer, K. Nishijima, M. Takita, T. Hayakawa, Y. Totsuka, K. Nishikawa, A. Yoshimoto, Yuichi Oyama, Kunio Matsumoto, A.K. Mann, W. Frati, M. Yamada, T. Kajimura, T. Suda, Masayuki Nakahata, Y. Hayato, Yusuke Koshio, and N. Kishi
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Range (particle radiation), Neutrino, Neutrino oscillation, Energy (signal processing)
Abstract: Data from the Kamiokande detector were used to study the atmospheric (v μ + v μ ) (v e + v e ) ratio in the multi-GeV energy range. The observed ratio of μ-like to e-like events relative to the calculated ratio, ( μ /e) data /( μ /e) MC = 0.57 -0.07 +0.08 ± 0.07, suggests that the atmospheric (v μ + v μ ) (v e + v e ) ratio is smaller than expected for these neutrino energies. Also studied was the zenith-angle dependence of the above ratio. Results of an analysis of neutrino oscillations are presented.
Published: 1994
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50. Analysis of curvature losses of whispering gallery modes in an optical dielectric disk by the finite-element method

Author: T. Yamamoto and M. Koshiba
Subjects: Physics, business.industry, Physics::Optics, Radius, Dielectric, Curvature, Waveguide (optics), Atomic and Molecular Physics, and Optics, Finite element method, Optics, Integrated optics, Mathematics::Differential Geometry, Astrophysics::Earth and Planetary Astrophysics, Whispering-gallery wave, business
Abstract: The finite-element method is applied to the analysis of curvature losses of whispering gallery modes in an optical dielectric disk. Numerical examples on the dielectric disks with various side shapes are given. We also demonstrate that when the curvature radius of the disk is large enough, the difference between the propagation constants obtained by considering and by ignoring the curvature loss is very small. >
Published: 1994
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