4.7 Article

Optimization of the first CUPID detector module

期刊

EUROPEAN PHYSICAL JOURNAL C
卷 82, 期 9, 页码 -

出版社

SPRINGER
DOI: 10.1140/epjc/s10052-022-10720-3

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资金

  1. Istituto Nazionale di Fisica Nucleare (INFN)
  2. European Research Council (ERC) under the European Union
  3. ERC [742345]
  4. Italian Ministry of University and Research (MIUR) through the grant Progetti di ricerca di Rilevante Interesse Nazionale (PRIN 2017) [2017FJZMCJ]
  5. US National Science Foundation [NSF-PHY-1401832, NSF-PHY-1614611, NSF-PHY-1913374]
  6. US Department of Energy (DOE) Office of Science [DE-AC02-05CH11231, DE-AC02-06CH11357]
  7. DOE Office of Science, Office of Nuclear Physics [DE-FG02-08ER41551, DE-SC0011091, DE-SC0012654, DE-SC0019316, DE-SC0019368, DE-SC0020423]
  8. National Research Foundation of Ukraine [2020.02/0011]
  9. Marie Sklodowska-Curie Grant Agreement [754496]
  10. U.S. Department of Energy (DOE) [DE-SC0020423, DE-SC0019316, DE-SC0019368] Funding Source: U.S. Department of Energy (DOE)
  11. Marie Curie Actions (MSCA) [754496] Funding Source: Marie Curie Actions (MSCA)
  12. European Research Council (ERC) [742345] Funding Source: European Research Council (ERC)

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CUPID is a next generation experiment aiming to search for neutrinoless double beta decay. Through the use of scintillating crystals coupled to light detectors, CUPID aims to achieve a background free environment. The experiment has demonstrated high particle identification capability and improved light collection efficiency.
CUPID will be a next generation experiment searching for the neutrinoless double beta decay, whose discovery would establish the Majorana nature of the neutrino. Based on the experience achieved with the CUORE experiment, presently taking data at LNOS, CUPID aims to reach a background free environment by means of scintillating (Li2MoO4)-Mo-100 crystals coupled to light detectors. Indeed, the simultaneous heat and light detection allows us to reject the dominant background of alpha particles, as proven by the CUPID-0 and CUPID-Mo demonstrators. In this work we present the results of the first test of the CUPID baseline module. In particular, we propose a new optimized detector structure and light sensors design to enhance the engineering and the light collection, respectively. We characterized the heat detectors, achieving an energy resolution of (5.9 +/- 0.2) keV FWHM at the Q-value of Mo-100 (about 3034 keV). We studied the light collection of the baseline CUPID design with respect to an alternative configuration which features gravity-assisted light detectors' mounting. In both cases we obtained an improvement in the light collection with respect to past measures and we validated the particle identification capability of the detector, which ensures an a particle rejection higher than 99.9%, fully satisfying the requirements for CUPID.

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