https://doi.org/10.1051/epjconf/20136504002
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: chernyak@kinr.kiev.ua
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.
© Owned by the authors, published by EDP Sciences, 2014
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
