Speaker
Description
Super-Kamiokande is a large water Cherenkov detector located 1,000 m underground in Kamioka, Japan. Cosmic-ray muons incident on Super-Kamiokande induce hadronic showers in water, and the showers producing neutrons and pions as well as unstable radioactive isotopes via spallation. These are a major background source at the MeV scale. Observations in Super-Kamiokande have been performed using ultra-pure water, and gadolinium was introduced into the water to improve the detection efficiency of neutrons and suppress the background due to radioactivities and PMT dark noises. In this study, we analyzed data for about one year after the gadolinium loading and measured the production yield of cosmogenic neutrons. The results will be presented in this poster.
