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Featured researches published by K. Ishihara.


Physical Review Letters | 2005

Measurement of neutrino oscillation with KamLAND: Evidence of spectral distortion

T. Araki; K. Eguchi; S. Enomoto; K. Furuno; K. Ichimura; H. Ikeda; K. Inoue; K. Ishihara; T. Iwamoto; T. Kawashima; Y. Kishimoto; M. Koga; Y. Koseki; T. Maeda; T. Mitsui; M. Motoki; Kazuo Nakajima; H. Ogawa; K. Owada; J.-S. Ricol; I. Shimizu; J. Shirai; F. Suekane; A. Suzuki; K. Tada; O. Tajima; K. Tamae; Y. Tsuda; H. Watanabe; J. Busenitz

We present results of a study of neutrino oscillation based on a 766 ton-year exposure of KamLAND to reactor anti-neutrinos. We observe 258 \nuebar\ candidate events with energies above 3.4 MeV compared to 365.2 events expected in the absence of neutrino oscillation. Accounting for 17.8 expected background events, the statistical significance for reactor \nuebar disappearance is 99.998%. The observed energy spectrum disagrees with the expected spectral shape in the absence of neutrino oscillation at 99.6% significance and prefers the distortion expected from \nuebar oscillation effects. A two-neutrino oscillation analysis of the KamLAND data gives \DeltaMSq = 7.9


Physical Review Letters | 1998

Measurement of the flux and zenith angle distribution of upward through going muons in Kamiokande II + III

S. Hatakeyama; T. Hara; Y. Fukuda; T. Hayakawa; Koji Inoue; K. Ishihara; H. Ishino; S. Joukou; T. Kajita; S. Kasuga; Y. Koshio; T. Kumita; K. Matsumoto; M. Nakahata; K. Nakamura; K. Okumura; A. Sakai; M. Shiozawa; J. Suzuki; Y. Suzuki; T. Tomoeda; Y. Totsuka; K.S. Hirata; K. Kihara; Y. Oyama; M. Koshiba; K. Nishijima; T. Horiuchi; K. Fujita; M. Koga

^{+0.6}_{-0.5}\times10^{-5}


Physics Letters B | 1996

Study of neutron background in the atmospheric neutrino sample in Kamiokande

Y. Fukuda; T. Hayakawa; Koji Inoue; K. Ishihara; H. Ishino; S. Joukou; T. Kajita; S. Kasuga; Y. Koshio; T. Kumita; K. Matsumoto; M. Nakahata; K. Nakamura; K. Okumura; A. Sakai; M. Shiozawa; J. Suzuki; Y. Suzuki; T. Tomoeda; Y. Totsuka; K.S. Hirata; K. Kihara; Y. Oyama; M. Koshiba; T. Horiuchi; K. Nishijima; K. Fujita; S. Hatakeyama; M. Koga; Tomoyuki Maruyama

eV


Astroparticle Physics | 2012

Self-shielding effect of a single phase liquid xenon detector for direct dark matter search

A. Minamino; Ko Abe; Y. Ashie; J. Hosaka; K. Ishihara; K. Kobayashi; Y. Koshio; C. Mitsuda; S. Moriyama; M. Nakahata; Y. Nakajima; T. Namba; H. Ogawa; H. Sekiya; M. Shiozawa; Y. Suzuki; Atsushi Takeda; Y. Takeuchi; K. Taki; K. Ueshima; Y. Ebizuka; A. Ota; Shinsuke Suzuki; H. Hagiwara; Y. Hashimoto; Shintaro Kamada; Masato Kikuchi; N. Kobayashi; T. Nagase; Shogo Nakamura

^2


Physical Review Letters | 1996

SOLAR NEUTRINO DATA COVERING SOLAR CYCLE 22

Y. Fukuda; T. Hayakawa; Koji Inoue; K. Ishihara; H. Ishino; S. Joukou; T. Kajita; S. Kasuga; Y. Koshio; T. Kumita; K. Matsumoto; M. Nakahata; K. Nakamura; K. Okumura; Akito Sakai; M. Shiozawa; J. Suzuki; Y. Suzuki; T. Tomoeda; Y. Totsuka; K.S. Hirata; K. Kihara; Y. Oyama; M. Koshiba; K. Nishijima; T. Horiuchi; K. Fujita; S. Hatakeyama; M. Koga; Tomoyuki Maruyama

. A global analysis of data from KamLAND and solar neutrino experiments yields \DeltaMSq = 7.9


Physical Review D | 1997

Large scale anisotropy of the cosmic ray muon flux in Kamiokande

K. Munakata; T. Kiuchi; S. Yasue; C. Kato; S. Mori; K.S. Hirata; K. Kihara; Y. Oyama; Masaki Mori; K. Fujita; S. Hatakeyama; M. Koga; Tomoyuki Maruyama; A. Suzuki; T. Ishizuka; K. Miyano; H. Okazawa; Y. Fukuda; T. Hayakawa; K. Inoue; K. Ishihara; H. Ishino; S. Joukou; T. Kajita; S. Kasuga; Y. Koshio; T. Kumita; K. Matsumoto; Masayuki Nakahata; K. Nakamura

^{+0.6}_{-0.5}\times10^{-5}


Physical Review D | 2004

Publisher's Note: Search for dark matter WIMPs using upward through-going muons in Super-Kamiokande [Phys. Rev. D 70, 083523 (2004)]

S. Desai; Y. Ashie; S. Fukuda; Y. Fukuda; K. Ishihara; Y. Itow; Y. Koshio; A. Minamino; M. Miura; S. Moriyama; M. Nakahata; T. Namba; R. Nambu; Y. Obayashi; N. Sakurai; M. Shiozawa; Y. Suzuki; H. Takeuchi; Y. Takeuchi; S. Yamada

eV


Physical Review Letters | 2004

High Sensitivity Search for ν̄e's from the Sun and Other Sources at KamLAND

K. Eguchi; S. Enomoto; K. Furuno; H. Ikeda; Kiyohiro Ikeda; Katsuya Inoue; K. Ishihara; Iwamoto; T. Kawashima; Y. Kishimoto; M. Koga; Y. Koseki; T. Maeda; T. Mitsui; M. Motoki; K. Nakajima; H. Ogawa; K. Owada; F. Piquemal; I. Shimizu; J. Shirai; F. Suekane; Akira Suzuki; K. Tada; O. Tajima; T. Takayama; K. Tamae; H. Watanabe; J. Busenitz; Z. Djurcic

^2


arXiv: High Energy Physics - Experiment | 1997

Experimental study of high-energy atmospheric neutrinos in Kamiokande

Y. Oyama; Y. Fukuda; T. Hayakawa; M. Takita; K. Okumura; K. Ishihara; K. Kihara; T. Yamaguchi; Koji Inoue; T. Kajita; M. Shiozawa; T. Ishizuka; K.S. Hirata; E. Ichihara; A. T. Suzuki; T. Tomoeda; S. Hatakeyama; Masaki Mori; A. Sakai; A. Suzuki; Tomoyuki Maruyama; K. Nakamura; K. Kaneyuki; Y. Nagashima; Y. Hayato; H. Ishino; J. Suzuki; Masayuki Nakahata; K. Miyano; Y. Totsuka

and \ThetaParam = 0.40

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Y. Fukuda

Miyagi University of Education

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