First results from KamLAND: evidence for reactor antineutrino disappearance

First results from KamLAND: evidence for reactor antineutrino disappearance

KamLAND has measured the flux of nu;(e)'s from distant nuclear reactors. We find fewer nu;(e) events than expected from standard assumptions about nu;(e) propagation at the 99.95% C.L. In a 162 ton.yr exposure the ratio of the observed inverse beta-decay events to the expected number without nu...

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Veröffentlicht in:Physical review letters 2003-01, Vol.90 (2), p.021802-021802, Article 021802
Hauptverfasser: Eguchi, K, Enomoto, S, Furuno, K, Goldman, J, Hanada, H, Ikeda, H, Ikeda, K, Inoue, K, Ishihara, K, Itoh, W, Iwamoto, T, Kawaguchi, T, Kawashima, T, Kinoshita, H, Kishimoto, Y, Koga, M, Koseki, Y, Maeda, T, Mitsui, T, Motoki, M, Nakajima, K, Nakajima, M, Nakajima, T, Ogawa, H, Owada, K, Sakabe, T, Shimizu, I, Shirai, J, Suekane, F, Suzuki, A, Tada, K, Tajima, O, Takayama, T, Tamae, K, Watanabe, H, Busenitz, J, Djurcic, Z, McKinny, K, Mei, D-M, Piepke, A, Yakushev, E, Berger, B E, Chan, Y D, Decowski, M P, Dwyer, D A, Freedman, S J, Fu, Y, Fujikawa, B K, Heeger, K M, Lesko, K T, Luk, K-B, Murayama, H, Nygren, D R, Okada, C E, Poon, A W P, Steiner, H M, Winslow, L A, Horton-Smith, G A, McKeown, R D, Ritter, J, Tipton, B, Vogel, P, Lane, C E, Miletic, T, Gorham, P W, Guillian, G, Learned, J G, Maricic, J, Matsuno, S, Pakvasa, S, Dazeley, S, Hatakeyama, S, Murakami, M, Svoboda, R C, Dieterle, B D, DiMauro, M, Detwiler, J, Gratta, G, Ishii, K, Tolich, N, Uchida, Y, Batygov, M, Bugg, W, Cohn, H, Efremenko, Y, Kamyshkov, Y, Kozlov, A, Nakamura, Y, De Braeckeleer, L, Gould, C R, Karwowski, H J, Markoff, D M, Messimore, J A, Nakamura, K, Rohm, R M, Tornow, W, Young, A R, Wang, Y-F
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Sprache:eng
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Zusammenfassung:KamLAND has measured the flux of nu;(e)'s from distant nuclear reactors. We find fewer nu;(e) events than expected from standard assumptions about nu;(e) propagation at the 99.95% C.L. In a 162 ton.yr exposure the ratio of the observed inverse beta-decay events to the expected number without nu;(e) disappearance is 0.611+/-0.085(stat)+/-0.041(syst) for nu;(e) energies >3.4 MeV. In the context of two-flavor neutrino oscillations with CPT invariance, all solutions to the solar neutrino problem except for the "large mixing angle" region are excluded.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.90.021802