Detection of accelerator-produced neutrinos at a distance of 250 km
The KEK to Kamioka long-baseline neutrino experiment (K2K) has begun its investigation of neutrino oscillations suggested by atmospheric neutrino observations. Twenty-eight neutrino events have been detected in coincidence with the expected arrival time of the beam in the 22.5 kt fiducial volume of Super-Kamiokande, the far detector at 250 km distance. The expectation is 37.8-3.8+3.5, derived using measurements of neutrino interactions in a near detector and extrapolation using a beam simulation validated by a measurement of pion kinematics after production and focusing. The background is of order 10-3 events. © 2001 Elsevier Science B.V.
Ahn, SH; An, S; Aoki, S; Berns, HG; Bhang, HC; Boyd, S; Casper, D; Chikamatsu, T; Choi, JH; Echigo, S; Etoh, M; Fujii, K; Fukuda, S; Fukuda, Y; Gajewski, W; Golebiewska, U; Hara, T; Hasegawa, T; Hayato, Y; Hill, J; Hong, SJ; Ieiri, M; Inada, T; Inagaki, T; Ishida, T; Ishii, H; Ishii, T; Ishino, H; Ishitsuka, M; Itow, Y; Iwashita, T; Jang, HI; Jang, JS; Jeon, EJ; Jeong, EM; Jung, CK; Kadowaki, T; Kajita, T; Kameda, J; Kaneyuki, K; Kato, I; Kato, Y; Kearns, E; Kenmochi, S; Khang, BH; Kibayashi, A; Kielczewska, D; Kim, BJ; Kim, CO; Kim, HI; Kim, JH; Kim, JY; Kim, SB; Kishi, S; Kitamura, M; Kobayashi, K; Kobayashi, T; Kobayashi, Y; Kohama, M; Koo, DG; Koshio, Y; Kropp, W; Kume, G; Kusano, E; Learned, JG; Lee, HK; Lee, JW; Lee, SB; Lim, IT; Lim, SH; Maesaka, H; Martens, K; Maruyama, T; Matsuno, S; Mauger, C; McGrew, C; Minakawa, M; Mine, S; Miura, M; Miyamoto, S; Miyano, K; Moriyama, S; Mukai, S; Nakahata, M; Nakamura, K; Nakamura, M; Nakano, I; Nakaya, T; Nakayama, S; Nakayoshi, K; Nishijima, K; Nishikawa, K; Nishiyama, S; Noda, S; Noumi, H; Obayashi, Y; Oh, JK; Okada, A; Onchi, M; Otaki, T
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