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Measurement of the cosmogenic neutron yield in Super-Kamiokande with gadolinium loaded water

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Dec 2022

Cosmic-ray muons that enter the Super-Kamiokande detector cause hadronicshowers due to spallation in water, producing neutrons and radioactiveisotopes. Those are a major background source for studies of MeV-scaleneutrinos and searches for rare events. Since 2020, gadolinium was introducedin the ultra-pure water in the Super-Kamiokande detector to improve thedetection efficiency of neutrons. In this study, the cosmogenic neutron yieldwas measured using data acquired during the period after the gadoliniumloading. The yield was found to be $(2.76 \pm 0.02\,\mathrm{(stat.) \pm0.19\,\mathrm{(syst.)}}) \times 10^{-4}\,\mu^{-1} \mathrm{g^{-1} cm^{2}}$ at259\,GeV of average muon energy at the Super-Kamiokande detector.

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