Scintillator Detectors of Charged Particles for a Cherenkov Neutrino Detector.

The parameters of scintillator veto detectors that should be installed in an intermediate water Cherenkov detector of the Hyper-Kamiokande project have been measured. The veto detectors are disc scintillators with embedded wavelength-shifting fibers and with compact photosensors, i.e., silicon photomultipliers. It is shown that the detection efficiency of these detectors for cosmic muons is larger than 99%. [ABSTRACT FROM AUTHOR]