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Open Access Publications from the University of California

Be 7 solar neutrino measurement with KamLAND

  • Author(s): 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
  • et al.

© 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.

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