Abstract

JSNS^2 (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source) is an experiment that is searching for sterile neutrinos via the observation of {bar{nu }}_{mu } rightarrow {bar{nu }}_{e} appearance oscillations using muon decay-at-rest neutrinos. Before dedicated data taking in the first-half of 2021, we performed a commissioning run for 10 days in June 2020. Using the data obtained in this commissioning run, in this paper, we present an estimate of the correlated background which imitates the {bar{nu }}_{e} signal in a sterile neutrino search. In addition, in order to demonstrate future prospects of the JSNS^2 experiment, possible pulse shape discrimination improvements towards reducing cosmic ray induced fast neutron background are described.

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