M
Masatoshi Koshiba
Researcher at University of Tokyo
Publications - 102
Citations - 16220
Masatoshi Koshiba is an academic researcher from University of Tokyo. The author has contributed to research in topics: Neutrino & Neutrino detector. The author has an hindex of 41, co-authored 93 publications receiving 15572 citations. Previous affiliations of Masatoshi Koshiba include Tokai University & Kobe University.
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Journal ArticleDOI
Evidence for oscillation of atmospheric neutrinos
Y. Fukuda,T. Hayakawa,E. Ichihara,Kunio Inoue,K. Ishihara,H. Ishino,Yoshitaka Itow,Takaaki Kajita,J. Kameda,S. Kasuga,Ken-ichiro Kobayashi,Yohei Kobayashi,Yusuke Koshio,M. Miura,Masayuki Nakahata,S. Nakayama,A. Okada,Ko Okumura,N. Sakurai,Masato Shiozawa,Yoshihiro Suzuki,Y. Takeuchi,Y. Totsuka,Shinya Yamada,M. Earl,Alec Habig,E. Kearns,M. D. Messier,Kate Scholberg,J. L. Stone,Lawrence Sulak,C. W. Walter,M. Goldhaber,T. Barszczxak,D. Casper,W. Gajewski,P. G. Halverson,J. Hsu,W. R. Kropp,L. R. Price,Frederick Reines,Michael B. Smy,Henry W. Sobel,Mark R. Vagins,K. S. Ganezer,W. E. Keig,R. W. Ellsworth,S. Tasaka,J. W. Flanagan,A. Kibayashi,John G. Learned,S. Matsuno,V. J. Stenger,D. Takemori,T. Ishii,Junichi Kanzaki,T. Kobayashi,S. Mine,K. Nakamura,K. Nishikawa,Yuichi Oyama,A. Sakai,Makoto Sakuda,Osamu Sasaki,S. Echigo,M. Kohama,A. T. Suzuki,Todd Haines,Todd Haines,E. Blaufuss,B. K. Kim,R. Sanford,R. Svoboda,M. L. Chen,Z. Conner,Z. Conner,J. A. Goodman,G. W. Sullivan,J. Hill,C. K. Jung,K. Martens,C. Mauger,C. McGrew,E. Sharkey,B. Viren,C. Yanagisawa,W. Doki,Kazumasa Miyano,H. Okazawa,C. Saji,M. Takahata,Y. Nagashima,M. Takita,Takashi Yamaguchi,Minoru Yoshida,Soo-Bong Kim,M. Etoh,K. Fujita,Akira Hasegawa,Takehisa Hasegawa,S. Hatakeyama,T. Iwamoto,M. Koga,Tomoyuki Maruyama,Hiroshi Ogawa,J. Shirai,A. Suzuki,F. Tsushima,Masatoshi Koshiba,M. Nemoto,Kyoshi Nishijima,T. Futagami,Y. Hayato,Y. Kanaya,K. Kaneyuki,Y. Watanabe,D. Kielczewska,D. Kielczewska,R. A. Doyle,J. S. George,A. L. Stachyra,L. Wai,L. Wai,R. J. Wilkes,K. K. Young +124 more
Abstract: We present an analysis of atmospheric neutrino data from a 33.0 kton yr (535-day) exposure of the Super-Kamiokande detector. The data exhibit a zenith angle dependent deficit of muon neutrinos which is inconsistent with expectations based on calculations of the atmospheric neutrino flux. Experimental biases and uncertainties in the prediction of neutrino fluxes and cross sections are unable to explain our observation. The data are consistent, however, with two-flavor ${\ensuremath{
u}}_{\ensuremath{\mu}}\ensuremath{\leftrightarrow}{\ensuremath{
u}}_{\ensuremath{\tau}}$ oscillations with ${sin}^{2}2\ensuremath{\theta}g0.82$ and $5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}l\ensuremath{\Delta}{m}^{2}l6\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}3}\mathrm{eV}{}^{2}$ at 90% confidence level.
Journal ArticleDOI
Observation of a neutrino burst from the supernova SN1987A.
K. S. Hirata,Takaaki Kajita,Masatoshi Koshiba,Masayuki Nakahata,Yuichi Oyama,Nobuaki Sato,A. Suzuki,Masato Takita,Y. Totsuka,Tadashi Kifune,Teruhiro Suda,Kasuke Takahashi,T. Tanimori,Kazumasa Miyano,Miho Yamada,E. W. Beier,L. R. Feldscher,Soo-Bong Kim,A.K. Mann,F.M. Newcomer,R. Van,W. Zhang,B. G. Cortez +22 more
TL;DR: A neutrino burst was observed in the Kamiokande II detector on 23 February, 7:35:35 UT (7.1 min) during a time interval of 13 sec as mentioned in this paper.
Journal ArticleDOI
Solar 8B and hep Neutrino Measurements from 1258 Days of Super-Kamiokande Data
Y. Fukuda,M. Ishitsuka,Yoshitaka Itow,Takaaki Kajita,J. Kameda,K. Kaneyuki,K. Kobayashi,Yusuke Koshio,M. Miura,S. Moriyama,Masayuki Nakahata,S. Nakayama,A. Okada,N. Sakurai,Masato Shiozawa,Yoshihiro Suzuki,H. Takeuchi,Y. Takeuchi,T. Toshito,Y. Totsuka,Shoichi Yamada,Shantanu Desai,M. Earl,E. Kearns,M. D. Messier,Kate Scholberg,Kate Scholberg,J. L. Stone,L. R. Sulak,C. W. Walter,M. Goldhaber,T. Barszczak,David William Casper,W. Gajewski,W. R. Kropp,S. Mine,D. W. Liu,L. R. Price,M. B. Smy,Henry W. Sobel,M. R. Vagins,Todd Haines,D. Kielczewska,K. S. Ganezer,W. E. Keig,R. W. Ellsworth,S. Tasaka,A. Kibayashi,John G. Learned,S. Matsuno,D. Takemori,Y. Hayato,T. Ishii,Takashi Kobayashi,Koji Nakamura,Y. Obayashi,Y. Oyama,A. Sakai,Makoto Sakuda,M. Kohama,Atsumu Suzuki,T. Inagaki,Tsuyoshi Nakaya,K. Nishikawa,E. Blaufuss,S. Dazeley,R. Svoboda,J. A. Goodman,G. Guillian,G. W. Sullivan,D. Turcan,Alec Habig,J. Hill,C. K. Jung,K. Martens,K. Martens,Magdalena Malek,C. Mauger,C. McGrew,E. Sharkey,B. Viren,C. Yanagisawa,C. Mitsuda,K. Miyano,C. Saji,T. Shibata,Y. Kajiyama,Y. Nagashima,K. Nitta,M. Takita,Minoru Yoshida,Heekyong Kim,Soo-Bong Kim,J. Yoo,H. Okazawa,T. Ishizuka,M. Etoh,Y. Gando,Takehisa Hasegawa,Kunio Inoue,K. Ishihara,Tomoyuki Maruyama,J. Shirai,A. Suzuki,Masatoshi Koshiba,Y. Hatakeyama,Y. Ichikawa,M. Koike,Kyoshi Nishijima,H. Fujiyasu,Hirokazu Ishino,M. Morii,Y. Watanabe,U. Golebiewska,S. C. Boyd,A. L. Stachyra,R. J. Wilkes,B. Lee +117 more
TL;DR: Solar neutrino measurements from 1258 days of data from the Super-Kamiokande detector are presented and the recoil electron energy spectrum is consistent with no spectral distortion.
Journal ArticleDOI
Measurement of atmospheric neutrino oscillation parameters by Super-Kamiokande I
Y. Ashie,J. Hosaka,K. Ishihara,Yoshitaka Itow,J. Kameda,Yusuke Koshio,A. Minamino,C. Mitsuda,M. Miura,Shigetaka Moriyama,Masayuki Nakahata,Toshio Namba,R. Nambu,Y. Obayashi,Masato Shiozawa,Yoshihiro Suzuki,Y. Takeuchi,K. Taki,Shinya Yamada,M. Ishitsuka,Takaaki Kajita,K. Kaneyuki,Shoei Nakayama,A. Okada,Ko Okumura,C. Saji,Y. Takenaga,S. Clark,Shantanu Desai,E. Kearns,S. Likhoded,J. L. Stone,L. R. Sulak,W. Wang,M. Goldhaber,David William Casper,J. P. Cravens,W. Gajewski,W. R. Kropp,D. W. Liu,S. Mine,Michael B. Smy,Henry W. Sobel,C. W. Sterner,Mark R. Vagins,K. S. Ganezer,John Hill,W. E. Keig,J. S. Jang,J. Y. Kim,I. T. Lim,Kate Scholberg,C. W. Walter,R. W. Ellsworth,S. Tasaka,G. Guillian,A. Kibayashi,John G. Learned,S. Matsuno,D. Takemori,M. D. Messier,Y. Hayato,A. K. Ichikawa,T. Ishida,T. Ishii,T. Iwashita,Takashi Kobayashi,T. Maruyama,Koji Nakamura,K. Nitta,Yuichi Oyama,Makoto Sakuda,Y. Totsuka,Atsumu Suzuki,Masaya Hasegawa,K. Hayashi,I. Kato,H. Maesaka,Taichi Morita,Tsuyoshi Nakaya,K. Nishikawa,T. Sasaki,S. Ueda,Shoji Yamamoto,Todd Haines,Todd Haines,S. Dazeley,S. Hatakeyama,R. Svoboda,E. Blaufuss,J. A. Goodman,G. W. Sullivan,D. Turcan,Alec Habig,Y. Fukuda,C. K. Jung,T. Kato,Katsuhiro Kobayashi,Magdalena Malek,C. Mauger,C. McGrew,A. Sarrat,E. Sharkey,C. Yanagisawa,T. Toshito,Kazumasa Miyano,N. Tamura,J. Ishii,Y. Kuno,Minoru Yoshida,S. B. Kim,J. Yoo,H. Okazawa,T. Ishizuka,Y. Choi,H. Seo,Y. Gando,Takehisa Hasegawa,Kunio Inoue,J. Shirai,A. Suzuki,Masatoshi Koshiba,Y. Nakajima,Kyoshi Nishijima,T. Harada,Hirokazu Ishino,Y. Watanabe,D. Kielczewska,D. Kielczewska,J. Zalipska,H. G. Berns,R. Gran,K. K. Shiraishi,A. L. Stachyra,K. Washburn,R. J. Wilkes +135 more
TL;DR: In this article, a combined analysis of fully-contained, partially-contained and upward-going muon atmospheric neutrino data from a 1489 d exposure of the Super-Kamiokande detector is presented.
Journal ArticleDOI
Determination of solar neutrino oscillation parameters using 1496 days of Super-Kamiokande-I data
S. Fukuda,Y. Fukuda,M. Ishitsuka,Yoshitaka Itow,Takaaki Kajita,J. Kameda,K. Kaneyuki,K. Kobayashi,Yusuke Koshio,M. Miura,S. Moriyama,Masayuki Nakahata,S. Nakayama,Toshio Namba,A. Okada,N. Sakurai,Masato Shiozawa,Yoshihiro Suzuki,H. Takeuchi,Y. Takeuchi,Y. Totsuka,Shoichi Yamada,Shantanu Desai,M. Earl,E. Kearns,M. D. Messier,J. L. Stone,L. R. Sulak,C. W. Walter,M. Goldhaber,T. Barszczak,David William Casper,W. Gajewski,W. R. Kropp,S. Mine,D. W. Liu,M. B. Smy,Henry W. Sobel,M. R. Vagins,A. M. Gago,K. S. Ganezer,W. E. Keig,R. W. Ellsworth,S. Tasaka,A. Kibayashi,John G. Learned,S. Matsuno,D. Takemori,Y. Hayato,T. Ishii,Takashi Kobayashi,T. Maruyama,Koji Nakamura,Y. Obayashi,Y. Obayashi,Y. Oyama,Makoto Sakuda,Minoru Yoshida,M. Kohama,T. Iwashita,Atsumu Suzuki,A. K. Ichikawa,A. K. Ichikawa,T. Inagaki,I. Kato,Tsuyoshi Nakaya,K. Nishikawa,Todd Haines,Todd Haines,S. Dazeley,S. Hatakeyama,R. Svoboda,E. Blaufuss,M. L. Chen,J. A. Goodman,G. Guillian,G. W. Sullivan,D. Turč,Kate Scholberg,Alec Habig,M. Ackermann,J. Hill,C. K. Jung,Magdalena Malek,K. Martens,C. Mauger,C. McGrew,E. Sharkey,B. Viren,B. Viren,C. Yanagisawa,T. Toshito,C. Mitsuda,K. Miyano,C. Saji,T. Shibata,Y. Kajiyama,Y. Nagashima,K. Nitta,M. Takita,Hyosun Kim,S. B. Kim,J. Yoo,H. Okazawa,T. Ishizuka,M. Etoh,Y. Gando,Takehisa Hasegawa,Kunio Inoue,K. Ishihara,J. Shirai,A. Suzuki,Masatoshi Koshiba,Y. Hatakeyama,Y. Ichikawa,M. Koike,Kyoshi Nishijima,Hirokazu Ishino,Mikio Morii,R. Nishimura,Y. Watanabe,D. Kielczewska,D. Kielczewska,H. G. Berns,S. C. Boyd,A. L. Stachyra,R. J. Wilkes +126 more
TL;DR: In this paper, a number of different fits to solar neutrino mixing and mass square difference were performed using 1496 days of Super-Kamiokande-I's solar NE data.