7Be solar neutrino measurement with KamLAND
/ Authors
A. Gando, Y. Gando, H. Hanakago, H. Ikeda, K. Inoue, K. Ishidoshiro, H. Ishikawa, Y. Kishimoto, M. Koga, R. Matsuda
and 61 more authors
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. McKee, A. Piepke, T. Banks, T. Bloxham, S. Freedman, B. Fujikawa, K. Han, L. Hsu, K. Ichimura, H. Murayama, T. O’Donnell, H. Steiner, L. Winslow, D. Dwyer, C. Mauger, R. Mckeown, C. Zhang, B. Berger, C. Lane, J. Maricic, T. Miletić, J. Learned, M. Sakai, G. Horton-Smith, A. Tang, K. Downum, K. Tolich, Y. Efremenko, Y. Kamyshkov, O. Perevozchikov, H. Karwowski, D. Markoff, W. Tornow, J. Detwiler, S. Enomoto, K. Heeger, M. Decowski
/ Abstract
We report a measurement of the neutrino-electron elastic scattering rate of 862 keV ^7Be 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)×10^9cm^(−2)s^(−1), assuming a pure electron-flavor flux. Comparing this flux with the standard solar model prediction and further assuming three-flavor mixing, a ν_e survival probability of 0.66±0.15 is determined from the KamLAND data. Utilizing a global three-flavor oscillation analysis, we obtain a total ^7Be solar neutrino flux of (5.82±1.02)×10^9cm^(−2)s^(−1), which is consistent with the standard solar model predictions.
Journal: Physical Review C