Open AccessSearch for Supernova Relic Neutrinos at KamLAND
Author(s) -
Shigeru Obara,
S. Ieki,
K. Ishidoshiro,
Tadao Mitsui,
H. Watanabe,
M. P. Decowski
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2156/1/012138
Subject(s) - physics , neutrino , supernova , particle physics , flux (metallurgy) , annihilation , solar neutrino , nuclear physics , electron neutrino , dark matter , neutrino oscillation , solar neutrino problem , borexino , astrophysics , materials science , metallurgy
We report a search for electron antineutrinos at KamLAND with an 8.3−30.8 MeV energy range via the inverse beta decay. In 6.72 kton-yr of KamLAND data, we found 18 neutrino candidates and no significant excess over estimated backgrounds. From data interpretation, with the assumption of some supernova relic neutrino spectrum predictions, we give upper flux limits of 60−110 cm −2 s −1 (90% CL) in the analysis range and present a model-independent flux. These upper limits are the most stringent for 8−13 MeV region. We also improve on the upper probability limit of 8 B solar neutrinos converting into antineutrinos via the Resonant Spin Flavor Precession with the neutrino magnetic moment. Besides, we could set limits on the annihilation cross-section for light dark matter pairs to neutrino pairs.