Be 7 solar neutrino measurement with KamLAND
© 2015 American Physical Society. We report a measurement of the neutrino-electron elastic scattering rate of 862 keV Be7 solar neutrinos based on a 165.4 kt d exposure of KamLAND. The observed rate is 582±94(kt d)-1, which corresponds to an 862-keV Be7 solar neutrino flux of (3.26±0.52)×109cm-2s-1, assuming a pure electron-flavor flux. Comparing this flux with the standard solar model prediction and further assuming three-flavor mixing, a νe survival probability of 0.66±0.15 is determined from the KamLAND data. Utilizing a global three-flavor oscillation analysis, we obtain a total Be7 solar neutrino flux of (5.82±1.02)×109cm-2s-1, which is consistent with the standard solar model predictions.
Gando, A; Gando, Y; Hanakago, H; Ikeda, H; Inoue, K; Ishidoshiro, K; Ishikawa, H; Kishimoto, Y; Koga, M; Matsuda, R; Matsuda, S; Mitsui, T; Motoki, D; Nakajima, K; Nakamura, K; Obata, A; Oki, A; Oki, Y; Otani, M; Shimizu, I; Shirai, J; Suzuki, A; Tamae, K; Ueshima, K; Watanabe, H; Xu, BD; Yamada, S; Yamauchi, Y; Yoshida, H; Kozlov, A; Takemoto, Y; Yoshida, S; Grant, C; Keefer, G; McKee, DW; Piepke, A; Banks, TI; Bloxham, T; Freedman, SJ; Fujikawa, BK; Han, K; Hsu, L; Ichimura, K; Murayama, H; O'Donnell, T; Steiner, HM; Winslow, LA; Dwyer, D; Mauger, C; McKeown, RD; Zhang, C; Berger, BE; Lane, CE; Maricic, J; Miletic, T; Learned, JG; Sakai, M; Horton-Smith, GA; Tang, A; Downum, KE; Tolich, K; Efremenko, Y; Kamyshkov, Y; Perevozchikov, O; Karwowski, HJ; Markoff, DM; Tornow, W; Detwiler, JA; Enomoto, S; Heeger, K; Decowski, MP
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