Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Neutrino Astronomy & Physics (NU)
First result of a search for Diffuse Supernova Neutrino Background in SK-Gd experiment
M. Harada* and  On behalf of the Super-Kamiokande Collaboration
*: corresponding author
Full text: pdf
Pre-published on: July 25, 2023
Published on: September 27, 2024
Abstract
Since 2020, Super-Kamiokande (SK) detector has been updated by loading gadolinium (Gd) as a
new experimental phase, ‘SK-Gd.’ In the SK-Gd experiment, we can search low-energy electron
antineutrinos via inverse-beta decay with efficient neutron identification thanks to high crosssection
and high-energy gamma-ray emission of thermal neutron capture on Gd. Until July 2022,
the observation is operated with the 0.01% Gd mass concentration. The neutron capture fraction
on Gd is about 50% in this situation. In this paper, the first search result for the flux of astrophysical
electron antineutrinos for the energy range of O(10) MeV in SK-Gd with a 22.5 × 552 kton·day
exposure at 0.01% Gd mass concentration of the initial stage of SK-Gd is reported.
DOI: https://doi.org/10.22323/1.444.1173
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