| Abstract: | Cosmic-ray muons that enter the Super-Kamiokande detector cause hadronic
showers due to spallation in water, producing neutrons and radioactive
isotopes. Those are a major background source for studies of MeV-scale
neutrinos and searches for rare events. Since 2020, gadolinium was introduced
in the ultra-pure water in the Super-Kamiokande detector to improve the
detection efficiency of neutrons. In this study, the cosmogenic neutron yield
was measured using data acquired during the period after the gadolinium
loading. The yield was found to be $(2.76 pm 0.02,mathrm{(stat.) pm
0.19,mathrm{(syst.)}}) imes 10^{-4},mu^{-1} mathrm{g^{-1} cm^{2}}$ at
259,GeV of average muon energy at the Super-Kamiokande detector. |
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