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Title: Characterization of cubic Li2100MoO4 crystals for the CUPID experiment

Journal Article · · European Physical Journal. C, Particles and Fields
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The CUPID Collaboration is designing a tonne-scale, background-free detector to search for double beta decay with sufficient sensitivity to fully explore the parameter space corresponding to the inverted neutrino mass hierarchy scenario. One of the CUPID demonstrators, CUPID-Mo, has proved the potential of enriched Li2100MoO4 crystals as suitable detectors for neutrinoless double beta decay search. In this work, we characterised cubic crystals that, compared to the cylindrical crystals used by CUPID-Mo, are more appealing for the construction of tightly packed arrays. We measured an average energy resolution of (6.7±0.6) keV FWHM in the region of interest, approaching the CUPID target of 5 keV FWHM. We assessed the identification of α particles with and without a reflecting foil that enhances the scintillation light collection efficiency, proving that the baseline design of CUPID already ensures a complete suppression of this α-induced background contribution. We also used the collected data to validate a Monte Carlo simulation modelling the light collection efficiency, which will enable further optimisations of the detector.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); European Commission - Marie Sklodowska-Curie Actions (MSCA); National Science Foundation (NSF); Instituto Nazionale di Fisica Nucleare (INFN); Italian Ministry of Education, Universities and Research (MIUR)
Contributing Organization:
The CUPID Collaboration
Grant/Contract Number:
AC02-05CH11231; AC02-06CH11357; FG02-08ER41551; SC0011091; SC0012654; SC0019316; SC0019368; SC0020423
OSTI ID:
1766545
Alternate ID(s):
OSTI ID: 1735551; OSTI ID: 1840544
Journal Information:
European Physical Journal. C, Particles and Fields, Vol. 81, Issue 2; ISSN 1434-6044
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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