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Yoshida, I. Shimizu, J.A. Detwiler, J.G. Learned, J. Maricic, J. Shirai, J.-S. Ricol, KamLAND Collaboration: S. Abe, K.E. Downum, K. Furuno, K. Han, K. Ichimura, K. Inoue, K.M. Heeger, K. Nakajima, K. Nakamura, K. Narita, K. Tamae, K. Tolich, L.A. Winslow, M. Batygov, M. Koga, M. Nakamura, M.P. Decowski, M. Sakai, N. Nagai, N. Takahashi, O. Perevozchikov, R.D. McKeown, R. Kadel, S. Enomoto, S.J. Freedman, S. Matsuno, S. Pakvasa, S. Yoshida, T. Bloxham, T.I. Banks, T. Miletic, T. Mitsui, T. Morikawa, T. O'Donnell, W. Kimura, W. Tornow, Y. Efremenko, Y. Gando, Y. Kamyshkov, Y. Kibe, Y. Kishimoto, Y. Minekawa, Y. Shimizu, Y. Takemoto","submitted_at":"2011-06-04T21:45:46Z","abstract_excerpt":"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. 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