Abstract
Hyper-Kamiokande is a next generation water Cherenkov detector for the study of neutrino oscillations including the search for leptonic CP violation. In order to reduce the systematic uncertainty, a 1 kton scale intermediate water Cherenkov detector (IWCD) is planned to be constructed at around 1 km downstream the J-PARC neutrino beamline. The multi-PMT modules, which consist of 19 3 inch PMTs will be installed in the IWCD to improve the detector performance with their higher granularity. We have measured the characteristics of candidate 3-inch PMTs such as gain, peak to valley ratio, timing resolution and after pulses, and checked the impact to the detector performance.
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