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Published September 13, 2011 | Published
Journal Article Open

Measurement of the ^8B solar neutrino flux with the KamLAND liquid scintillator detector


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) ×10^6 cm^(−2_s^(−1). The analysis threshold is driven by ^(208)Tl present in the liquid scintillator, and the main source of systematic uncertainty is due to background from cosmogenic ^(11)Be. The measured rate is consistent with existing measurements and with standard solar model predictions which include matter-enhanced neutrino oscillation.

Additional Information

© 2011 American Physical Society. Received 8 June 2011; published 13 September 2011. The KamLAND experiment is supported by a Grant-in-Aid for Specially Promoted Research under Grant No. 16002002 of the Japanese Ministry of Education, Culture, Sports, Science and Technology; the World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan; and under the US Department of Energy (DOE) Grants No. DE-FG03-00ER41138, No. DE-AC02-05CH11231, and No. DE-FG02-01ER41166, as well as other DOE grants to individual institutions. The reactor data are provided by courtesy of the following electric associations in Japan: Hokkaido, Tohoku, Tokyo, Hokuriku, Chubu, Kansai, Chugoku, Shikoku, and Kyushu Electric Power Companies, Japan Atomic Power Co., and Japan Atomic Energy Agency. The Kamioka Mining and Smelting Company provided service for activities in the mine.

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Published - Abe2011p15938Phys_Rev_C.pdf


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