Rejection of randomly coinciding events in ZnMoO \(_4\) scintillating bolomete

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• 作者：D. M. Chernyak (1) (2)
  F. A. Danevich (1)
  A. Giuliani (2) (3)
  M. Mancuso (2) (3)
  C. Nones (4)
  E. Olivieri (2)
  M. Tenconi (2)
  V. I. Tretyak (1)
  
• 刊名：The European Physical Journal C - Particles and Fields
• 出版年：2014
• 出版时间：June 2014
• 年：2014
• 卷：74
• 期：6
• 全文大小：
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• 作者单位：D. M. Chernyak (1) (2)
  F. A. Danevich (1)
  A. Giuliani (2) (3)
  M. Mancuso (2) (3)
  C. Nones (4)
  E. Olivieri (2)
  M. Tenconi (2)
  V. I. Tretyak (1)
  
  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, 22100, Como, Italy
  4. Service de Physique des Particules, CEA-Saclay, 91191?, Gif sur Yvette, France
  
• ISSN：1434-6052

文摘

Random coincidence of events (particularly from two neutrino double beta decay) could be one of the main sources of background in the search for neutrinoless double beta decay with cryogenic bolometers due to their poor time resolution. Pulse-shape discrimination by using front edge analysis, mean-time and \(\chi ^2\) methods were applied to discriminate randomly coinciding events in ZnMoO \(_4\) cryogenic scintillating bolometers. These events can be effectively rejected at the level of 99?% by the analysis of the heat signals with rise-time of about 14?ms and signal-to-noise ratio of 900, and at the level of 92?% by the analysis of the light signals with rise-time of about 3?ms and signal-to-noise ratio of 30, under the requirement to detect 95?% of single events. These rejection efficiencies are compatible with extremely low background levels in the region of interest of neutrinoless double beta decay of \(^{100}\) Mo for enriched ZnMoO \(_4\) detectors, of the order of \(10^{-4}\) ?counts/(y?keV?kg). Pulse-shape parameters have been chosen on the basis of the performance of a real massive ZnMoO \(_4\) scintillating bolometer. Importance of the signal-to-noise ratio, correct finding of the signal start and choice of an appropriate sampling frequency are discussed.