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Limits on Astrophysical Antineutrinos with the KamLAND Experiment

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dc.contributor.authorAbe, S.
dc.contributor.authorAsami, S.
dc.contributor.authorGando, A.
dc.contributor.authorGando, Y.
dc.contributor.authorKozlov, A.
dc.contributor.authorКозлов, Александр Анатольевич
dc.date.accessioned2024-12-26T08:09:28Z
dc.date.available2024-12-26T08:09:28Z
dc.date.issued2022
dc.description.abstractWe report on a search for electron antineutrinos ((nu) over bar (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 B-8 solar neutrinos converting into (nu) over bar (e), P-nu e ->nu e < 3.5 x 10(-5) (90% CL) assuming an undistorted <(nu)over bar>(e) flux of 60 cm(-2) s(-1) (90% CL) in the analysis energy range.
dc.identifier.citationLimits on Astrophysical Antineutrinos with the KamLAND Experiment / Abe, S [et al.] // Astrophysical Journal. - 2022. - 925. - № 1. - 10.3847/1538-4357/ac32c1
dc.identifier.doi10.3847/1538-4357/ac32c1
dc.identifier.urihttps://www.doi.org/10.3847/1538-4357/ac32c1
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dc.identifier.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000744654000001
dc.identifier.urihttps://openrepository.mephi.ru/handle/123456789/28710
dc.relation.ispartofAstrophysical Journal
dc.titleLimits on Astrophysical Antineutrinos with the KamLAND Experiment
dc.typeArticle
dspace.entity.typePublication
oaire.citation.issue1
oaire.citation.volume925
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