S. Hatakeyama
Tohoku University
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Featured researches published by S. Hatakeyama.
Physical Review Letters | 1998
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
The flux of upward through-going muons of minimum (mean) threshold energy > 1.6 (3.0) GeV is measured, based on a total of 372 events observed by the Kamiokande II+III detector during 2456 detector live days. The observed muon flux was (1.94+-0.10(stat.)+0.07-0.06(sys.))*10^-13 /cm^2/s/sr, which is compared to an expected value of (2.46+-0.54(theo.))*10^-13/cm^2/s/sr. The observation is in agreement with the prediction within the errors. The zenith angle dependence of the observed upward through-going muons supports the previous indication of neutrino oscillations made by Kamiokande using sub- and multi-GeV atmospheric neutrino events.
Physics Letters B | 1996
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
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.
Physical Review Letters | 1996
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
Physical Review D | 1997
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
arXiv: High Energy Physics - Experiment | 1997
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
