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. 2003 Jan 17;90(2):021802.
doi: 10.1103/PhysRevLett.90.021802. Epub 2003 Jan 17.

First results from KamLAND: evidence for reactor antineutrino disappearance

K Eguchi  1 , S Enomoto, K Furuno, J Goldman, H Hanada, H Ikeda, K Ikeda, K Inoue, K Ishihara, W Itoh, T Iwamoto, T Kawaguchi, T Kawashima, H Kinoshita, Y Kishimoto, M Koga, Y Koseki, T Maeda, T Mitsui, M Motoki, K Nakajima, M Nakajima, T Nakajima, H Ogawa, K Owada, T Sakabe, I Shimizu, J Shirai, F Suekane, A Suzuki, K Tada, O Tajima, T Takayama, K Tamae, H Watanabe, J Busenitz, Z Djurcic, K McKinny, D-M Mei, A Piepke, E Yakushev, B E Berger, Y D Chan, M P Decowski, D A Dwyer, S J Freedman, Y Fu, B K Fujikawa, K M Heeger, K T Lesko, K-B Luk, H Murayama, D R Nygren, C E Okada, A W P Poon, H M Steiner, L A Winslow, G A Horton-Smith, R D McKeown, J Ritter, B Tipton, P Vogel, C E Lane, T Miletic, P W Gorham, G Guillian, J G Learned, J Maricic, S Matsuno, S Pakvasa, S Dazeley, S Hatakeyama, M Murakami, R C Svoboda, B D Dieterle, M DiMauro, J Detwiler, G Gratta, K Ishii, N Tolich, Y Uchida, M Batygov, W Bugg, H Cohn, Y Efremenko, Y Kamyshkov, A Kozlov, Y Nakamura, L De Braeckeleer, C R Gould, H J Karwowski, D M Markoff, J A Messimore, K Nakamura, R M Rohm, W Tornow, A R Young, Y-F Wang; KamLAND Collaboration
Affiliations
Free article

First results from KamLAND: evidence for reactor antineutrino disappearance

K Eguchi et al. Phys Rev Lett. .
Free article

Abstract

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.

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