ARAKI, T.; EGUCHI, K.; ENOMOTO, S.; FURUNO, K.; ICHIMURA, K.; IKEDA, H.; INOUE, K.; ISHIHARA, K.; IWAMOTO, T.; KAWASHIMA, T.; KISHIMOTO, Y.; KOGA, M.; KOSEKI, Y.; MAEDA, T.; MITSUI, T.; MOTOKI, M.; NAKAJIMA, K.; OGAWA, H.; OWADA, K.; RICOL, J.-S.; SHIMIZU, I.; SHIRAI, J.; SUEKANE, F.; SUZUKI, A.; TADA, K.; TAJIMA, O.; TAMAE, K.; TSUDA, Y.; WATANABE, H.; BUSENITZ, J.; CLASSEN, T.; DJURCIC, Z.; KEEFER, G.; MCKINNY, K.; MEI, D.-M.; PIEPKE, A.; YAKUSHEV, E.; E. BERGER, B.; D. CHAN, Y.; P. DECOWSKI, M.; DWYER, D.A.; J. FREEDMAN, S.; FU, Y.; K. FUJIKAWA, B.; GOLDMAN, J.; GRAY, F.; M. HEEGER, K.; T. LESKO, K.; LUK, K.-B.; MURAYAMA, H.; W. P. POON, A.; M. STEINER, H.; A. WINSLOW, L.; A. HORTON-SMITH, G.; MAUGER, C.; D. MCKEOWN, R.; VOGEL, P.; E. LANE, C.; MILETIC, T.; W. GORHAM, P.; GUILLIAN, G.; G. LEARNED, J.; MARICIC, J.; MATSUNO, S.; PAKVASA, S.; DAZELEY, S.; HATAKEYAMA, S.; ROJAS, A.; SVOBODA, R.; D. DIETERLE, B.; DETWILER, J.; GRATTA, G.; ISHII, K.; TOLICH, N.; UCHIDA, Y.; BATYGOV, M.; BUGG, W.; EFREMENKO, Y.; KAMYSHKOV, Y.; KOZLOV, A.; NAKAMURA, Y.; R. GOULD, C.; J. KARWOWSKI, H.; M. MARKOFF, D.; A. MESSIMORE, J.; NAKAMURA, K.; M. ROHM, R.; TORNOW, W.; WENDELL, R.; R. YOUNG, A.; CHEN, M.-J.; WANG, Y.-F.; PIQUEMAL, F.

doi:10.1103/PhysRevLett.94.081801

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Physical Review Letters. 2005, vol. 94, p. 081801

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We present results of a study of neutrino oscillation based on a 766 ton/year exposure of KamLAND to reactor antineutrinos. We observe 258 [overline nu ]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 [overline nu ]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 [overline nu ]e oscillation effects. A two-neutrino oscillation analysis of the KamLAND data gives Deltam2=7.9-0.5+0.6×10-5 eV2. A global analysis of data from KamLAND and solar-neutrino experiments yields Deltam2=7.9-0.5+0.6×10-5 eV2 and tan2theta=0.40-0.07+0.10, the most precise determination to date.< Réduire

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Measurement of Neutrino Oscillation with KamLAND: Evidence of Spectral Distortion

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