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SUMMARY:Seach for supernova relic neutrinos at KamLAND
DTSTART;VALUE=DATE-TIME:20210830T154500Z
DTEND;VALUE=DATE-TIME:20210830T160000Z
DTSTAMP;VALUE=DATE-TIME:20260712T142507Z
UID:indico-contribution-15725@indico.ific.uv.es
DESCRIPTION:Speakers: Shuhei Obara (Tohoku University)\nWe report a search
  for electron antineutrinos at KamLAND with an energy range of 8.3--30.8 M
 eV via the inverse beta decay.\nIn 4528 days of KamLAND data\, we found 18
  event candidates and no significant excess over estimated backgrounds.\nF
 rom data interpretation\, with the assumption of some supernova relic neut
 rino spectrum predictions\, we give upper flux limits of $60$--$110\\\,{\\
 mathrm{cm}^{-2}\\mathrm{s}^{-1}}$ ($90\\%$ CL) in the analysis range and p
 resent a model-independent flux.\nThese upper limits are the most stringen
 t for 8.3--12 MeV region to date.\nWe also improve on the upper probabilit
 y limit of $^8$B solar neutrinos converting into antineutrinos via the Res
 onant Spin Flavor Precession with the neutrino magnetic moment.\nBesides\,
  we could set limits on the annihilation cross section for light dark matt
 er pairs to neutrino pairs.\n\nhttps://indico.ific.uv.es/event/6178/contri
 butions/15725/
LOCATION:
URL:https://indico.ific.uv.es/event/6178/contributions/15725/
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