Phys. Rev. Lett.
100,
221803
(2008)
[5 pages]
Precision Measurement of Neutrino Oscillation Parameters with KamLAND
S. Abe et al. The KamLAND Collaboration
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S. Abe1, T. Ebihara1, S. Enomoto1, K. Furuno1, Y. Gando1, K. Ichimura1, H. Ikeda1, K. Inoue1, Y. Kibe1, Y. Kishimoto1, M. Koga1, A. Kozlov1, Y. Minekawa1, T. Mitsui1, K. Nakajima1,*, K. Nakajima1, K. Nakamura1, M. Nakamura1, K. Owada1, I. Shimizu1, Y. Shimizu1, J. Shirai1, F. Suekane1, A. Suzuki1, Y. Takemoto1, K. Tamae1, A. Terashima1, H. Watanabe1, E. Yonezawa1, S. Yoshida1, J. Busenitz2, T. Classen2, C. Grant2, G. Keefer2, D. S. Leonard2, D. McKee2, A. Piepke2, M. P. Decowski3, J. A. Detwiler3, S. J. Freedman3, B. K. Fujikawa3, F. Gray3,†, E. Guardincerri3, L. Hsu3,‡, R. Kadel3, C. Lendvai3, K.-B. Luk3, H. Murayama3, T. O’Donnell3, H. M. Steiner3, L. A. Winslow3, D. A. Dwyer4, C. Jillings4,§, C. Mauger4, R. D. McKeown4, P. Vogel4, C. Zhang4, B. E. Berger5, C. E. Lane6, J. Maricic6, T. Miletic6, M. Batygov7, J. G. Learned7, S. Matsuno7, S. Pakvasa7, J. Foster8, G. A. Horton-Smith8, A. Tang8, S. Dazeley9,**, K. E. Downum10, G. Gratta10, K. Tolich10, W. Bugg11, Y. Efremenko11, Y. Kamyshkov11, O. Perevozchikov11, H. J. Karwowski12, D. M. Markoff12, W. Tornow12, K. M. Heeger13, F. Piquemal14, and J.-S. Ricol14 (The KamLAND Collaboration)
1Research Center for Neutrino Science, Tohoku University, Sendai 980-8578, Japan 2Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama 35487, USA 3Physics Department, University of California, Berkeley and Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA 4W. K. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125, USA 5Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA 6Physics Department, Drexel University, Philadelphia, Pennsylvania 19104, USA 7Department of Physics and Astronomy, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA 8Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA 9Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA 10Physics Department, Stanford University, Stanford, California 94305, USA 11Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA 12Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708, USA and Physics Departments at Duke University, North Carolina Central University, and the University of North Carolina at Chapel Hill, North Carolina, USA 13Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA 14CEN Bordeaux-Gradignan, IN2P3-CNRS and University Bordeaux I, F-33175 Gradignan Cedex, France
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Publisher's Note, Publisher's Note
Received 29 January 2008; published 5 June 2008; publisher error corrected 10 December 2008
The KamLAND experiment has determined a precise value for the neutrino oscillation parameter Δm212 and stringent constraints on θ12. The exposure to nuclear reactor antineutrinos is increased almost fourfold over previous results to 2.44×1032 proton yr due to longer livetime and an enlarged fiducial volume. An undistorted reactor ν̅ 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 Δm212=7.58-0.13+0.14(stat)-0.15+0.15(syst)×10-5 eV2 and tan2θ12=0.56-0.07+0.10(stat)-0.06+0.10(syst). Local Δχ2 minima at higher and lower Δm212 are disfavored at >4σ. Combining with solar neutrino data, we obtain Δm212=7.59-0.21+0.21×10-5 eV2 and tan2θ12=0.47-0.05+0.06.
© 2008 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.221803
DOI:
10.1103/PhysRevLett.100.221803
PACS:
14.60.Pq, 26.65.+t, 28.50.Hw, 91.35.−x
*Present address: Center of Quantum Universe, Okayama University, Okayama 700-8530, Japan. †Present address: Regis University, Denver, CO 80221, USA. ‡Present address: FNAL, Batavia, IL 60510, USA. §Present address: SNOLAB, Lively, ON P3Y 1M3, Canada. **Present address: LLNL, Livermore, CA 94550, USA.
See Also
Publisher's Note:
S. Abe et al. KamLAND Collaboration,
Publisher’s Note: Precision Measurement of Neutrino Oscillation Parameters with KamLAND [Phys. Rev. Lett. 100, 221803 (2008)],
Phys. Rev. Lett. 101, 119904 (2008).
Publisher's Note:
S. Abe et al. KamLAND Collaboration,
Publisher’s Note: Precision Measurement of Neutrino Oscillation Parameters with KamLAND [Phys. Rev. Lett. 100, 221803 (2008)],
Phys. Rev. Lett. 101, 259901 (2008).
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