Measurement Of Neutrino Oscillation With Kamland: Evidence Of Spectral Distortion

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,Berger B E,Chan Y D,Decowski M P,Dwyer D A,Freedman S J,Fu Y,Fujikawa B K,Goldman J,Gray F,Heeger K M,Lesko K T,Luk K-B,Murayama H,Poon A W P,Steiner H M,Winslow L A,Horton-Smith G A,Mauger C,McKeown R D,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, Rojas A,Svoboda R, Dieterle B D,Detwiler J,Gratta G,Ishii K,Tolich N,Uchida Y,Batygov M,Bugg W,Efremenko Y,Kamyshkov Y,Kozlov A,Nakamura Y,Gould C R,Karwowski H J,Markoff D M,Messimore J A,Nakamura K,Rohm R M,Tornow W,Wendell R,Young A R,Chen M-J,Wang Y-F,Piquemal F, Null Null

PHYSICAL REVIEW LETTERS（2005）

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摘要

We present results of a study of neutrino oscillation based on a 766 ton/year exposure of KamLAND to reactor antineutrinos. We observe 258 (nu) over bar (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 (nu) over bar (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 (nu) over bar (e) oscillation effects. A two-neutrino oscillation analysis of the KamLAND data gives Deltam(2)=7.9(-0.5)(+0.6)x10(-5) eV(2). A global analysis of data from KamLAND and solar-neutrino experiments yields Deltam(2)=7.9(-0.5)(+0.6)x10(-5) eV(2) and tan(2)theta=0.40(-0.07)(+0.10), the most precise determination to date.

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