Персона: Козлов, Александр Анатольевич
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Институт ядерной физики и технологий
Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.
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Александр Анатольевич
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- ПубликацияТолько метаданныеSearch for Low-energy Electron Antineutrinos in KamLAND Associated with Gravitational Wave Events(2021) Abe, S.; Asami, S.; Gando, A.; Gando, Y.; Kozlov, A.; Козлов, Александр АнатольевичWe present the results of a search for MeV-scale electron antineutrino events in KamLAND coincident with the 60 gravitational wave events/candidates reported by the LIGO/Virgo collaboration during their second and third observing runs. We find no significant coincident signals within a 500 s timing window from each gravitational wave and present 90% C.L. upper limits on the electron antineutrino fluence between 10(8) and 10(13) cm(-2) for neutrino energies in the energy range of 1.8-111 MeV.
- ПубликацияТолько метаданныеLimits on Astrophysical Antineutrinos with the KamLAND Experiment(2022) Abe, S.; Asami, S.; Gando, A.; Gando, Y.; Kozlov, A.; Козлов, Александр АнатольевичWe 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.
- ПубликацияТолько метаданныеSearch for Solar Flare Neutrinos with the KamLAND Detector(2022) Collaboration, K.; Abe, S.; Asami, S.; Gando, A.; Kozlov, A.; Козлов, Александр Анатольевич© 2022. The Author(s). Published by the American Astronomical Society.We report the result of a search for neutrinos in coincidence with solar flares from the GOES flare database. The search was performed on a 10.8 kton-year exposure of KamLAND collected from 2002 to 2019. This large exposure allows us to explore previously unconstrained parameter space for solar flare neutrinos. We found no statistical excess of neutrinos and established 90% confidence level upper limits of 8.4 × 107 cm-2 (3.0 × 109 cm-2) on the electron antineutrino (electron neutrino) fluence at 20 MeV normalized to the X12 flare, assuming that the neutrino fluence is proportional to the X-ray intensity.
- ПубликацияОткрытый доступSearch for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen(2023) Abe, S.; Asami, S.; Eizuka, M.; Futagi, S.; Kozlov, A.; Козлов, Александр Анатольевич