Abstract
A liquid scintillator containing 96Zr has been developed for ZICOS experiment. We will use 180 tons of liquid scintillator with 64 % photo coverage of 20 inch photomultiplier. In order to reach the sensitivity [math] ≥ 1027 years, we have to achieve 50 % enrichment of 96 Zr and reduce 95 % of 208Tl decay backgrounds. Using Monte Carlo simulation, we could reduce 93 % of 208Tl background with 78 % efficiency for 0νββ signal using difference of Cherenkov hit pattern. For the separation of Cherenkov and scintillation signals, we measured the timing pulse shape of Zr loaded liquid scintillator using FADC digitizer, and we found an inconsistent pulse shape at the rising time with the template of scintillation. Also the event rate with an inconsistent pulse shape seems to have a directionality.
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