Rejection of randomly coinciding 2ν2β events in ZnMoO4 scintillating bolometers
1 Institute for Nuclear Research, MSP 03680 Kyiv, Ukraine
2 Centre de Sciences Nucléaires et de Sciences de la Matière, 91405 Orsay, France
3 Dipartimento di Scienza e Alta Tecnologia dell'Università dell'Insubria, I-22100 Como, Italy
4 Service de Physique des Particules, CEA-Saclay, F-91191 Gif sur Yvette, France
a e-mail: email@example.com
Published online: 10 January 2014
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 χ2 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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