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Published November 2015 | Published + Submitted
Journal Article Open

^7Be solar neutrino measurement with KamLAND


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.

Additional Information

© 2015 American Physical Society. Received 23 May 2014; revised manuscript received 22 July 2015; published 30 November 2015. The KamLAND experiment is supported by the Grant-in-Aid for Specially Promoted Research under Grants No. 16002002 and No. 21000001 of the Japanese Ministry of Education, Culture, Sports, Science and Technology; the World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan; Stichting FOM in the Netherlands; and under the US Department of Energy (DOE) Grants No. DE-AC02-05CH11231 and No. DE-FG02-01ER41166, as well as other DOE grants to individual institutions. The Kamioka Mining and Smelting Company has provided service for activities in the mine.

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Submitted - 1405.6190v2.pdf

Published - PhysRevC.92.055808.pdf


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August 20, 2023
August 20, 2023