Low-energy astrophysics with KamLAND

Discussion timeslot (ZOOM-Meeting): 20. July 2021 - 12:00
ZOOM-Meeting URL: https://desy.zoom.us/j/91999581729
ZOOM-Meeting ID: 91999581729
ZOOM-Meeting Passcode: ICRC2021
Corresponding Session: https://icrc2021-venue.desy.de/channel/38-The-Future-of-Neutrino-Telescopes-NU/78
Live-Stream URL: https://icrc2021-venue.desy.de/livestream/Discussion-05/6

Abstract:
'We present two results of a search for MeV-scale neutrino and anti-neutrino events correlated with gravitational wave events/candidates and large solar flares with KamLAND.rnrnThe KamLAND detector is a large-volume neutrino detector using liquid scintillator, which is located at 1 km underground under the top of Mt. Ikenoyama in Kamioka, Japan.rnKamLAND has multiple reaction channels to detect neutrinos. Electron antineutrino can be detected via inverse-beta decay with 1.8 MeV neutrino energy threshold. All flavors of neutrinos can be detected via neutrino-electron scattering without neutrino energy threshold.rnKamLAND has continued the neutrino observation since 2002 March.rnrnWe use the data set of 60 gravitational waves provided by the LIGO/Virgo collaboration during their second and third observing runs and search for coincident electron antineutrino events in KamLAND.rnWe find no significant coincident signals within a $pm$500 s timing window from each gravitational wave and present 90% C.L. upper limits on the electron antineutrino fluence between $10^{8}$--$10^{13}$ cm$^{-2}$ for neutrino energies of 1.8--111 MeV.rnrnFor a solar-flare neutrino search at KamLAND, we determine the timing window using the solar X-ray data set provided by the *GOES* satellite series from 2002 to 2019 and search for the excess of coincident event rate on the all-flavor neutrinos.rnWe find no significant event rate excess in the flare time windows and get 90% C.L. upper limits on the fluence of neutrinos of all flavors (electron anti-neutrinos) between $10^{10}$--$10^{13}$ cm$^{-2}$ ($10^{8}$--$10^{13}$ cm$^{-2}$) for neutrino energies in the energy range of 0.4--35 MeV.'

Authors: Nanami Kawada
Co-Authors: Shuhei Obara | Koji Ishidoshiro | For the KamLAND Collaboration
Collaboration: the KamLAND collaboration

Indico-ID: 1160
Proceeding URL: https://pos.sissa.it/395/1163