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Published February 20, 2004 | Published
Journal Article Open

High Sensitivity Search for v_e's from the Sun and Other Sources at KamLAND


Data corresponding to a KamLAND detector exposure of 0.28 kton yr has been used to search for ν̅ _e's in the energy range 8.3 < E_(ν̅e) < 14.8  MeV. No candidates were found for an expected background of 1.1±0.4 events. This result can be used to obtain a limit on ν̅_e fluxes of any origin. Assuming that all ν̅_e flux has its origin in the Sun and has the characteristic ^8B solar ν_e energy spectrum, we obtain an upper limit of 3.7×10^2  cm^(-2) ^(s-1) (90% C.L.) on the ν̅_e flux. We interpret this limit, corresponding to 2.8×10^(-4) of the standard solar model ^8B ν_e flux, in the framework of spin-flavor precession and neutrino decay models.

Additional Information

© 2004 The American Physical Society. Received 22 October 2003; published 20 February 2004. The KamLAND experiment is supported by the COE program of the Japanese Ministry of Education, Culture, Sports, Science, and Technology and the U.S. Department of Energy. We are grateful to the Kamioka Mining and Smelting Company for providing services at the experimental site.

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