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Published February 1, 2012 | Published
Journal Article Open

Search for Extraterrestrial Antineutrino Sources with the KamLAND Detector


We present the results of a search for extraterrestrial electron antineutrinos (ν_e's)in the energy range 8.3MeV < E_(νe) < 31.8MeV using the KamLAND detector. In an exposure of 4.53 kton-year, we identify 25 candidate events. All of the candidate events can be attributed to background, most importantly neutral current atmospheric neutrino interactions, setting an upper limit on the probability of ^8B solar ν_e's converting into ν_e's at 5.3 × 10^(–5) (90% CL), if we assume an undistorted v_e shape. This limit corresponds to a solar v_e flux of 93 cm^(–2) s^(–1) or an event rate of 1.6 events (kton–year)^(–1) above the energy threshold (E_(ve) ≥ 8.3MeV). The present data also allows us to set more stringent limits on the diffuse supernova neutrino flux and on the annihilation rates for light dark matter particles.

Additional Information

© 2012 American Astronomical Society. Received 2011 May 17; accepted 2011 October 23; published 2012 January 17. The KamLAND experiment is supported by the 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 U.S. Department of Energy (DOE) grant nos.DE-FG03-00ER41138, DE-AC02-05CH11231, and 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 Company, and Japan Atomic Energy Agency. The Kamioka Mining and Smelting Company has provided service for activities in the mine.

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