Autores
T Araki, K Eguchi, S Enomoto, K Furuno, K Ichimura, H Ikeda, K Inoue, K Ishihara, T Iwamoto, T Kawashima, Y Kishimoto, M Koga, Y Koseki, T Maeda, T Mitsui, M Motoki, K Nakajima, H Ogawa, K Owada, J-S Ricol, I Shimizu, J Shirai, F Suekane, A Suzuki, K Tada, O Tajima, K Tamae, Y Tsuda, H Watanabe, J Busenitz, T Classen, Z Djurcic, G Keefer, K McKinny, D-M Mei, A Piepke, E Yakushev, BE Berger, YD Chan, MP Decowski, DA Dwyer, SJ Freedman, Y Fu, BK Fujikawa, J Goldman, F Gray, KM Heeger, KT Lesko, K-B Luk, H Murayama, AWP Poon, HM Steiner, LA Winslow, GA Horton-Smith, C Mauger, RD McKeown, P Vogel, CE Lane, T Miletic, PW Gorham, G Guillian, JG Learned, J Maricic, S Matsuno, S Pakvasa, S Dazeley, S Hatakeyama, A Rojas, R Svoboda, BD Dieterle, J Detwiler, G Gratta, K Ishii, N Tolich, Y Uchida, M Batygov, W Bugg, Y Efremenko, Y Kamyshkov, A Kozlov, Y Nakamura, CR Gould, HJ Karwowski, DM Markoff, JA Messimore, K Nakamura, RM Rohm, W Tornow, R Wendell, AR Young, M-J Chen, Y-F Wang, F Piquemal, KamLAND Collaboration
Fecha de publicación
2005/3/1
Revista
Physical Review Letters
Volumen
94
Número
8
Páginas
081801
Editor
American Physical Society
Descripción
We present results of a study of neutrino oscillation based on a 766 ton/year exposure of KamLAND to reactor antineutrinos. We observe 258 ν e candidate events with energies above 3.4 MeV compared to 365.2±23.7 events expected in the absence of neutrino oscillation. Accounting for 17.8±7.3 expected background events, the statistical significance for reactor ν e disappearance is 99.998%. The observed energy spectrum disagrees with the expected spectral shape in the absence of neutrino oscillation at 99.6% significance and prefers the distortion expected from ν e oscillation effects. A two-neutrino oscillation analysis of the KamLAND data gives Δ m 2= 7.9− 0.5+ 0.6× 10− 5 e V 2. A global analysis of data from KamLAND and solar-neutrino experiments yields Δ m 2= 7.9− 0.5+ 0.6× 10− 5 e V 2 and tan 2 θ= 0.40− 0.07+ 0.10, the most precise determination to date.
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T Araki, K Eguchi, S Enomoto, K Furuno, K Ichimura… - Physical Review Letters, 2005
