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Search for Extraterrestrial Antineutrino Sources with the KamLAND Detector

Gando, A. and Dwyer, D. A. and McKeown, R. D. and Zhang, C. (2012) Search for Extraterrestrial Antineutrino Sources with the KamLAND Detector. Astrophysical Journal, 745 (2). Art. No. 193. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20120320-080033682

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/745/2/193DOIUNSPECIFIED
http://iopscience.iop.org/0004-637X/745/2/193/PublisherUNSPECIFIED
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.
Funders:
Funding AgencyGrant Number
Japanese Ministry of Education, Culture, Sports, Science and Technology 16002002
World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan UNSPECIFIED
Department of Energy (DOE)DE-FG03-00ER41138
Department of Energy (DOE)DE-AC02-05CH11231
Department of Energy (DOE)DE-FG02-01ER41166
Department of Energy (DOE)UNSPECIFIED
Subject Keywords: dark matter; ISM: supernova remnants; neutrinos; Sun: particle emission
Issue or Number:2
Record Number:CaltechAUTHORS:20120320-080033682
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120320-080033682
Official Citation: Search for Extraterrestrial Antineutrino Sources with the KamLAND Detector A. Gando et al. 2012 ApJ 745 193
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29775
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:20 Mar 2012 15:29
Last Modified:03 Oct 2019 03:44

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