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arXiv · 1312.0246

Rejection of randomly coinciding 2ν2β events in ZnMoO4 scintillating bolometers

D. M. Chernyak·F. A. Danevich·A. Giuliani·M. Mancuso·C. Nones·E. Olivieri·M. Tenconi·V. I. Tretyak
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Abstract

Random coincidence of 2ν2β decay events could be one of the main sources of background for 0ν2β decay in cryogenic bolometers due to their poor time resolution. Pulse-shape discrimination by using front edge analysis, the mean-time and \c{hi}2 methods was applied to discriminate randomly coinciding 2ν2β events in ZnMoO4 cryogenic scintillating bolometers. The background can be effectively rejected on the level of 99% by the mean-time analysis of heat signals with the rise time about 14 ms and the signal-to-noise ratio 900, and on the level of 98% for the light signals with 3 ms rise time and signal-to-noise ratio of 30 (under a requirement to detect 95% of single events). Importance of the signal-to-noise ratio, correct finding of the signal start and choice of an appropriate sampling frequency are discussed.

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D. M. Chernyak, F. A. Danevich, A. Giuliani, M. Mancuso, C. Nones, E. Olivieri, M. Tenconi, V. I. Tretyak. 2013-12-01. Rejection of randomly coinciding 2ν2β events in ZnMoO4 scintillating bolometers. https://doi.org/10.1051/epjconf%2F20136504002

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