A study of extraterrestrial antineutrino sources with the KamLAND detector

Journal Article · Wed May 18 00:00:00 EDT 2011 · The Astrophysical Journal

OSTI ID:1017073

Gando, A; Gando, Y; Ichimura, K; Ikeda, H; Inoue, K; Kibe, Y; Kishimoto, Y; Koga, M; Minekawa, Y; Mitsui, T; Morikawa, T; Nagai, N; Nakajima, K; Nakamura, K; Narita, K; Shimizu, I; Shimizu, Y; Shirai, J; Suekane, F; Suzuki, A ; Takahashi, H; Takahashi, N; Takemoto, Y; Tamae, K; Watanabe, H; Xu, B D; Yabumoto, H; Yoshida, H; Yoshida, S; Enomoto, S; Kozlov, A; Murayama, H; Grant, C; Keefer, G; Piepke, A; Banks, T I; Bloxham, T; Detwiler, J A; Freedman, S J; Fujikawa, B K; Han, K; Kadel, R; O'Donnell, T; Steiner, H M; Dwyer, D A; McKeown, R D; Zhang, C; Berger, B E; Lane, C E; Maricic, J; Miletic, T; Batygov, M; Learned, J G; Matsuno, S; Sakai, M; Horton-Smith, G A; Downum, K E; Gratta, G; Efremenko, Y; Kamyshkov, Y; Perevozchikov, O; Karwowski, H J; Markoff, D M; Tornow, W; Heeger, K M; Decowski, M P

We present the results of a search for extraterrestrial electron antineutrinos ({bar {nu}}{sub e}'s) in the energy range 8.3 MeV < E{sub {bar {nu}}}{sub e} < 30.8 MeV 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 {sup 8}B solar {nu}{sub e}'s converting into {bar {nu}}{sub e}'s at 5.3 x 10{sup -5} (90% C.L.). 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.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: Nuclear Science Division; Physics Division
• DOE Contract Number: DE-AC02-05CH11231
• OSTI ID: 1017073
• Report Number(s): LBNL-4610E; TRN: US1103164
• Journal Information: The Astrophysical Journal, Journal Name: The Astrophysical Journal
• Country of Publication: United States
• Language: English

Related Subjects

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ANNIHILATION
ANTINEUTRINOS
ELECTRON ANTINEUTRINOS
ENERGY RANGE
NEUTRAL CURRENTS
NEUTRINOS
NONLUMINOUS MATTER
PROBABILITY