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A CUPID (Li2MoO4)-Mo-100 scintillating bolometer tested in the CROSS underground facility
Journal article   Open access   Peer reviewed

A CUPID (Li2MoO4)-Mo-100 scintillating bolometer tested in the CROSS underground facility

A. Armatol, E. Armengaud, W. Armstrong, C. Augier, F. T. Avignone, O. Azzolini, I. C. Bandac, A. S. Barabash, G. Bari, A. Barresi, …
Journal of instrumentation, v 16(2)
01 Feb 2021
url
http://arxiv.org/abs/2011.13806View

Abstract

Instruments & Instrumentation Science & Technology Technology
A scintillating bolometer based on a large cubic (Li2MoO4)-Mo-100 crystal (45 mm side) and a Ge wafer (scintillation detector) has been operated in the CROSS cryogenic facility at the Canfranc underground laboratory in Spain. The dual-readout detector is a prototype of the technology that will be used in the next-generation 0 nu 2 beta experiment CUPID. The measurements were performed at 18 and 12 mK temperature in a pulse tube dilution refrigerator. This setup utilizes the same technology as the CUORE cryostat that will host CUPID and so represents an accurate estimation of the expected performance. The (Li2MoO4)-Mo-100 bolometer shows a high energy resolution of 6 keV FWHM at the 2615 keV gamma line. The detection of scintillation light for each event triggered by the (Li2MoO4)-Mo-100 bolometer allowed for a full separation (similar to 8 sigma) between gamma(beta) and alpha events above 2 MeV. The (Li2MoO4)-Mo-100 crystal also shows a high internal radiopurity with Th-228 and Ra-226 activities of less than 3 and 8 mu Bq/kg, respectively. Taking also into account the advantage of a more compact and massive detector array, which can be made of cubic-shaped crystals (compared to the cylindrical ones), this test demonstrates the great potential of cubic (Li2MoO4)-Mo-100 scintillating bolometers for high-sensitivity searches for the Mo-100 0 nu 2 beta decay in CROSS and CUPID projects.

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