Evaluation of neutron tagging efficiency for SK-Gd experiment
November 16, 2022
June 15, 2023
The world-largest water Cherenkov detector Super-Kamiokande was upgraded by loading 13 tons of gadolinium(Gd) sulfate octahydrate as a new experimental phase “SK-Gd”. Thermal neutron capture on Gd emits gamma-rays with a total energy of about 8 MeV, so we can detect the neutron signal in SK-Gd more efficiently than in the pure-water phase. Therefore, an increase in the sensitivity of the search for the Supernova Relic Neutrino will be expected in the SK-Gd. Accurate evaluation of the neutron tagging efficiency is essential for SK-Gd. For the evaluation of neutron tagging efficiency, measurement using Am/Be neutron source was carried out. In this proceedings, the result of the evaluation of the neutron tagging efficiency and comparison with simulation will be reported.
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