Measurement of the flux and zenith-angle distribution of upward throughgoing muons by super-kamiokande
A total of 614 upward throughgoing muons of minimum energy 1.6 GeV are observed by Super-Kamiokande during 537 detector live days. The measured muon flux is [1.74±0.07(stat)±0.02(sys)]×10-13cm-2s-1sr-1 compared to an expected flux of [1.97±0.44(theor)]×10-13cm-2s-1sr-1. The absolute measured flux is in agreement with the prediction within the errors. However, the zenith-angle dependence of the observed upward throughgoing muon flux does not agree with no-oscillation predictions. The observed distortion in shape is consistent with the vμ⟷vτ oscillation hypothesis with sin22θ> 0.4 and 1×10-3Δm2<1×10-1eV2 at 90% confidence level. © 2000 The American Physical Society.
Fukuda, Y; Hayakawa, T; Ichihara, E; Inoue, K; Ishihara, K; Ishino, H; Itow, Y; Kajita, T; Kameda, J; Kasuga, S; Kobayashi, K; Kobayashi, Y; Koshio, Y; Miura, M; Nakahata, M; Nakayama, S; Okada, A; Okumura, K; Sakurai, N; Shiozawa, M; Suzuki, Y; Takeuchi, Y; Totsuka, Y; Yamada, S; Earl, M; Habig, A; Kearns, E; Messier, MD; Scholberg, K; Stone, JL; Sulak, LR; Walter, CW; Goldhaber, M; Barszczak, T; Casper, D; Gajewski, W; Kropp, WR; Price, LR; Reines, F; Smy, M; Sobel, HW; Vagins, MR; Haines, TJ; Kielczewska, D; Ganezer, KS; Keig, WE; Ellsworth, RW; Tasaka, S; Flanagan, JW; Kibayashi, A; Learned, JG; Matsuno, S; Stenger, VJ; Takemori, D; Ishii, T; Kanzaki, J; Kobayashi, T; Mine, S; Nakamura, K; Nishikawa, K; Oyama, Y; Sakai, A; Sakuda, M; Sasaki, O; Echigo, S; Kohama, M; Suzuki, AT; Blaufuss, E; Kim, BK; Sanford, R; Svoboda, R; Chen, ML; Goodman, JA; Sullivan, GW; Hill, J; Jung, CK; Martens, K; Mauger, C; Mc Grew, C; Sharkey, E; Viren, B; Yanagisawa, C; Doki, W; Miyano, K; Okazawa, H; Saji, C; Takahata, M; Nagashima, Y; Takita, M; Yamaguchi, T; Yoshida, M; Kim, SB; Etoh, M; Fujita, K; Hasegawa, A; Hasegawa, T; Hatakeyama, S; Iwamoto, T; Koga, M
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