Limits on Astrophysical Antineutrinos with the KamLAND Experiment
-
Published:2022-01-01
Issue:1
Volume:925
Page:14
-
ISSN:0004-637X
-
Container-title:The Astrophysical Journal
-
language:
-
Short-container-title:ApJ
Author:
Abe S., Asami S., Gando A., Gando Y., Gima T., Goto A., Hachiya T.ORCID, Hata K., Hayashida S., Hosokawa K., Ichimura K.ORCID, Ieki S.ORCID, Ikeda H., Inoue K., Ishidoshiro K.ORCID, Kamei Y., Kawada N.ORCID, Kishimoto Y., Kinoshita T., Koga M., Maemura N., Mitsui T., Miyake H., Nakamura K., Nakamura K., Nakamura R., Ozaki H., Sakai T., Sambonsugi H., Shimizu I., Shirahata Y., Shirai J.ORCID, Shiraishi K., Suzuki A., Suzuki Y., Takeuchi A., Tamae K., Ueshima K., Wada Y., Watanabe H.ORCID, Yoshida Y., Obara S.ORCID, Ichikawa A. K., Kozlov A., Chernyak D., Takemoto Y., Yoshida S., Umehara S., Fushimi K., Hirata S., Nakamura K. Z., Yoshida M., Berger B. E., Fujikawa B. K.ORCID, Learned J. G., Maricic J., Axani S. N., Winslow L. A., Fu Z., Ouellet J., Efremenko Y., Karwowski H. J., Markoff D. M., Tornow W., Li A.ORCID, Detwiler J. A., Enomoto S., Decowski M. P.ORCID, Grant C., O’Donnell T., Dell’Oro S.
Abstract
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−2 s−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 of 8B solar neutrinos converting into
ν
¯
e
,
P
ν
e
→
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−2 s−1 (90% CL) in the analysis energy range.
Funder
MEXT ∣ Japan Society for the Promotion of Science U.S. Department of Energy National Science Foundation
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
23 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|