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Measurement of the 8B Solar Neutrino Flux with the KamLAND Liquid Scintillator Detector

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arxiv 1106.0861 v3 pith:ZYNMM36Z submitted 2011-06-04 hep-ex astro-ph.SRnucl-ex

Measurement of the 8B Solar Neutrino Flux with the KamLAND Liquid Scintillator Detector

KamLAND Collaboration: S. Abe , K. Furuno , A. Gando , Y. Gando , K. Ichimura , H. Ikeda , K. Inoue , Y. Kibe
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W. Kimura Y. Kishimoto M. Koga Y. Minekawa T. Mitsui T. Morikawa N. Nagai K. Nakajima K. Nakamura M. Nakamura K. Narita I. Shimizu Y. Shimizu J. Shirai F. Suekane A. Suzuki H. Takahashi N. Takahashi Y. Takemoto K. Tamae H. Watanabe B.D. Xu H. Yabumoto E. Yonezawa H. Yoshida S. Yoshida S. Enomoto A. Kozlov H. Murayama C. Grant G. Keefer D. McKee A. Piepke T.I. Banks T. Bloxham J.A. Detwiler S.J. Freedman B.K. Fujikawa K. Han R. Kadel T. O'Donnell H.M. Steiner L.A. Winslow D.A. Dwyer C. Mauger R.D. McKeown C. Zhang B.E. Berger C.E. Lane J. Maricic T. Miletic M. Batygov J.G. Learned S. Matsuno S. Pakvasa M. Sakai G.A. Horton-Smith A. Tang K.E. Downum G. Gratta K. Tolich Y. Efremenko Y. Kamyshkov O. Perevozchikov H.J. Karwowski D.M. Markoff W. Tornow K.M. Heeger F. Piquemal J.-S. Ricol M.P. Decowski
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classification hep-ex astro-ph.SRnucl-ex
keywords fluxneutrinoratesolaranalysiselectronkamlandkton-day
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report a measurement of the neutrino-electron elastic scattering rate from 8B solar neutrinos based on a 123 kton-day exposure of KamLAND. The background-subtracted electron recoil rate, above a 5.5 MeV analysis threshold is 1.49+/-0.14(stat)+/-0.17(syst) events per kton-day. Interpreted as due to a pure electron flavor flux with a 8B neutrino spectrum, this corresponds to a spectrum integrated flux of 2.77+/-0.26(stat)+/-0.32(syst) x 10^6 cm^-2s^-1. The analysis threshold is driven by 208Tl present in the liquid scintillator, and the main source of systematic uncertainty is due to background from cosmogenic 11Be. The measured rate is consistent with existing measurements and with Standard Solar Model predictions which include matter enhanced neutrino oscillation.

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