Limits on Astrophysical Antineutrinos with the KamLAND Experiment
Abstract

We report on a search for electron antineutrinos ($ν¯e$) from astrophysical sources in the neutrino energy range 8.3–30.8 MeV with the KamLAND detector. In an exposure of 6.72 kton-year of the liquid scintillator, we observe 18 candidate events via the inverse beta decay reaction. Although there is a large background uncertainty from neutral current atmospheric neutrino interactions, we find no significant excess over background model predictions. Assuming several supernova relic neutrino spectra, we give upper flux limits of 60–110 cm−2s−1(90% confidence level, CL) in the analysis range and present a model-independent flux. We also set limits on the annihilation rates for light dark matter pairs to neutrino pairs. These data improve on the upper probability limit of8B solar neutrinos converting into$ν¯e$,$Pνe→ν¯e<3.5×10−5$(90% CL) assuming an undistorted$ν¯e$shape. This corresponds to a solar$ν¯e$flux of 60 cm−2s−1(90% CL) in the analysis energy range.

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Award ID(s):
Publication Date:
NSF-PAR ID:
10361844
Journal Name:
The Astrophysical Journal
Volume:
925
Issue:
1
Page Range or eLocation-ID:
Article No. 14
ISSN:
0004-637X
Publisher:
DOI PREFIX: 10.3847
National Science Foundation
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