Abstract

The topological information (averaged angle) of Cherenkov light was measured by UNI-ZICOS detector. We have retuned the pulse shape discrimination for a selection of the photomultiplier which receives Cherenkov light for Hamamatsu H3164-12, and have developed a method of the vertex reconstruction. An averaged angle for fixed energy fixed direction electron generated by Compton scattering from Y-88 was used for the validity checking of the selection of PMT, and the obtained peak was found around 50 degree which was reproduced by Monte Carlo simulation. A pseudo background events of simultaneous beta and Compton electron scattered by gamma from the decay of Tl-208 was simulated by Co-60 β source. Obtained data indicated that the averaged angle of simultaneous beta with E ≤ 1.48 MeV plus gamma events should have a peak around 60 degree, and the value is different from 48 degree for an usual electron. In conclusion, the averaged angle will be able to use as a reduction method for Tl-208 beta decay backgrounds even though they have an energy around 3.35 MeV which is Q-value of Zr-96 neutrinoless double beta decay.

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