Measurement of a small atmospheric νμ
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 pe > 100 MeV/c, pμ > 200 MeV/c, and with visible energy less than 1.33 GeV. Using a detailed Monte Carlo simulation, the ratio (μ/e)DATA/(μ/e)MC was measured to be 0.61 ± 0.03(stat.) ± 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. © 1998 Published by Elsevier Science B.V. All rights reserved.
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; Martens, K; Miura, M; Nakahata, M; Nakayama, S; Okada, A; Oketa, M; Okumura, K; Ota, M; Sakurai, N; Shiozawa, M; Suzuki, Y; Takeuchi, Y; Totsuka, Y; Yamada, S; Earl, M; Habig, A; Hong, JT; Kearns, E; Kim, SB; Masuzawa, M; Messier, MD; Scholberg, K; Stone, JL; Sulak, LR; Walter, CW; Goldhaber, M; Barszczak, T; Gajewski, W; Halverson, PG; Hsu, J; Kropp, WR; Price, LR; Reines, F; Sobel, HW; Vagins, MR; Ganezer, KS; Keig, WE; Ellsworth, RW; Tasaka, S; Flanagan, JW; Kibayashi, A; Learned, JG; Matsuno, S; Stenger, V; Takemori, D; Ishii, T; Kanzaki, J; Kobayashi, T; Nakamura, K; Nishikawa, K; Oyama, Y; Sakai, A; Sakuda, M; Sasaki, O; Echigo, S; Kohama, M; Suzuki, AT; Haines, TJ; Blaufuss, E; Sanford, R; Svoboda, R; Chen, ML; Conner, Z; Goodman, JA; Sullivan, GW; Mori, M; Goebel, F; Hill, J; Jung, CK; Mauger, C; McGrew, C; Sharkey, E; Viren, B; Yanagisawa, C; Doki, W; Ishizuka, T; Kitaguchi, Y; Koga, H; Miyano, K; Okazawa, H; Saji, C; Takahata, M; Kusano, A; Nagashima, Y; Takita, M; Yamaguchi, T; Yoshida, M; Etoh, M; Fujita, K; Hasegawa, A; Hasegawa, T; Hatakeyama, S; Iwamoto, T; Kinebuchi, T; Koga, M; Maruyama, T; Ogawa, H; Saito, M; Suzuki, A; Tsushima, F; Koshiba, M; Nemoto, M; Nishijima, K; Futagami, T; Hayato, Y; Kanaya, Y; Kaneyuki, K; Watanabe, Y; Kielczewska, D; Doyle, R; George, J; Stachyra, A; Wai, L; Wilkes, J; Young, K
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