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Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)
A major background for the → 0¯s earch at the KOTO experiment is caused by neutrons generating two showers in the calorimeter made of 50 cm-long 2760 undoped CsI crystals stacked in a 1.9 m-diameter cylinder. Neutrons tend to have interactions deeper than photons. In 2018 we upgraded the calorimeter by installing 4080 silicon photomultipliers (SiPMs) on the front surface. Each crystal has been read out with a PMT on the back surface of the crystal. The depth and timing information on eachdoi:10.22323/1.390.0749 fatcat:xwopmlt26nernop5tnkldy7y4u