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7Be Solar Neutrino Measurement with KamLAND

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arxiv 1405.6190 v2 pith:NDAGRYDZ submitted 2014-05-23 hep-ex astro-ph.SRnucl-ex

7Be Solar Neutrino Measurement with KamLAND

A. Gando , Y. Gando , H. Hanakago , H. Ikeda , K. Inoue , K. Ishidoshiro , H. Ishikawa , Y. Kishimoto
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M. Koga R. Matsuda S. Matsuda T. Mitsui D. Motoki K. Nakajima K. Nakamura A. Obata A. Oki Y. Oki M. Otani I. Shimizu J. Shirai A. Suzuki K. Tamae K. Ueshima H. Watanabe B.D. Xu S. Yamada Y. Yamauchi H. Yoshida A. Kozlov Y. Takemoto S. Yoshida C. Grant G. Keefer D.W. McKee A. Piepke T.I. Banks T. Bloxham S.J. Freedman B.K. Fujikawa K. Han L. Hsu K. Ichimura H. Murayama T. O'Donnell H.M. Steiner L.A. Winslow D. Dwyer C. Mauger R.D. McKeown C. Zhang B.E. Berger C.E. Lane J. Maricic T. Miletic J.G. Learned M. Sakai G.A. Horton-Smith A. Tang K.E. Downum K. Tolich Y. Efremenko Y. Kamyshkov O. Perevozchikov H.J. Karwowski D.M. Markoff W. Tornow J.A. Detwiler S. Enomoto K. Heeger M.P. Decowski (The KamLAND Collaboration)
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classification hep-ex astro-ph.SRnucl-ex
keywords solarfluxflavorkamlandneutrinoassumingkton-daymeasurement
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We report a measurement of the neutrino-electron elastic scattering rate of 862 keV 7Be solar neutrinos based on a 165.4 kton-day exposure of KamLAND. The observed rate is 582 +/- 90 (kton-day)^-1, which corresponds to a 862 keV 7Be solar neutrino flux of (3.26 +/- 0.50) x 10^9 cm^-2s^-1, assuming a pure electron flavor flux. Comparing this flux with the standard solar model prediction and further assuming three flavor mixing, a nu_e survival probability of 0.66 +/- 0.14 is determined from the KamLAND data. Utilizing a global three flavor oscillation analysis, we obtain a total 7Be solar neutrino flux of (5.82 +/- 0.98) x 10^9 cm^-2s^-1, which is consistent with the standard solar model predictions.

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