Precision measurement of neutrino oscillation parameters with KamLAND
- Creators
- Abe, S.
- Ebihara, T.
- Enomoto, S.
- Furuno, K.
- Gando, Y.
- Ichimura, K.
- Ikeda, H.
- Inoue, K.
- Kibe, Y.
- Kishimoto, Y.
- Koga, M.
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Kozlov, A.
- Minekawa, Y.
- Mitsui, T.
- Nakajima, K.
- Nakajima, K.
- Nakamura, K.
- Nakamura, M.
- Owada, K.
- Shimizu, I.
- Shimizu, Y.
- Shirai, J.
- Suekane, F.
- Suzuki, A.
- Takemoto, Y.
- Tamae, K.
- Terashima, A.
- Watanabe, H.
- Yonezawa, E.
- Yoshida, S.
- Busenitz, J.
- Classen, T.
- Grant, C.
- Keefer, G.
- Leonard, D. S.
- McKee, D.
- Piepke, A.
- Decowski, M. P.
- Detwiler, J. A.
- Freedman, S. J.
- Fujikawa, B. K.
- Gray, F.
- Guardincerri, E.
- Hsu, L.
- Kadel, R.
- Lendvai, C.
- Luk, K.-B.
- Murayama, H.
- O'Donnell, T.
- Steiner, H. M.
- Winslow, L. A.
- Dwyer, D. A.
- Jillings, C.
- Mauger, C.
- McKeown, R. D.
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Vogel, P.
- Zhang, Z.
- Berger, B. E.
- Lane, C. E.
- Maricic, J.
- Miletic, T.
- Batygov, M.
- Learned, J. G.
- Matsuno, S.
- Pakvasa, S.
- Foster, J.
- Horton-Smith, G. A.
- Tang, A.
- Dazeley, S.
- Downum, K. E.
- Gratta, G.
- Tolich, K.
- Bugg, W.
- Efremenko, Y.
- Kamyshkov, Y.
- Perevozchikov, O.
- Karwowski, H. J.
- Markoff, D. M.
- Tornow, W.
- Heeger, K. M.
- Piquemal, F.
- Ricol, J.-S
Abstract
The KamLAND experiment has determined a precise value for the neutrino oscillation parameter Δm2 21 and stringent constraints on θ12. The exposure to nuclear reactor antineutrinos is increased almost fourfold over previous results to 2:44 x 10 32 proton yr due to longer livetime and an enlarged fiducial volume. An undistorted reactor ∇e energy spectrum is now rejected at >5σ. Analysis of the reactor spectrum above the inverse beta decay energy threshold, and including geoneutrinos, gives a best fit at Δm2 21= 7.58+0.14-0.13(stat)+0.15-0.15(syst)x10-5 eV2 and tan 2θ 2=0.56+0.10-0.07(stat)+0.10-0.06(syst). Local Δχ2 minima at higher and lower Δm2 21 are disfavored at >4σ. Combining with solar neutrino data, we obtain Δm2 21 7.59+0.21-0.21 X 10-5 eV2 and tan2θ12=0.47+0.06-0.05.
Additional Information
© 2008 The American Physical Society.(Received 29 January 2008; published 5 June 2008). The KamLAND experiment is supported by the Japanese Ministry of Education, Culture, Sports, Science and Technology, and under the United States Department of Energy Office Grant No. DEFG03-00ER41138 and other DOE grants to individual institutions. The reactor data are provided by courtesy of the following electric associations in Japan: Hokkaido, Tohoku, Tokyo, Hokuriku, Chubu, Kansai, Chugoku, Shikoku, and Kyushu Electric Power Companies, Japan Atomic Power Co., and Japan Nuclear Cycle Development Institute. The Kamioka Mining and Smelting Company has provided service for activities in the mine. PACS: 14.60.Pq; 26.65.+t; 28.50.Hw; 91.35.-xAttached Files
Published - ABEprl08a.pdf
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Additional details
- Eprint ID
- 13914
- Resolver ID
- CaltechAUTHORS:20090409-152721420
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Department of Energy Office (DOE)
- DE-FG03-00ER41138
- Created
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2009-08-03Created from EPrint's datestamp field
- Updated
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2023-03-16Created from EPrint's last_modified field