A scintillating bolometer based on a large cubic Li2 100MoO4 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 02 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 Li2 100MoO4 bolometer shows a high energy resolution of 6 keV FWHM at the 2615 keV line. The detection of scintillation light for each event triggered by the Li2 100MoO4 bolometer allowed for a full separation (∼8) between () and events above 2 MeV. The Li2 100MoO4 crystal also shows a high internal radiopurity with 228Th and 226Ra activities of less than 3 and 8 μBq/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 Li2 100MoO4 scintillating bolometers for high-sensitivity searches for the 100Mo 02 decay in CROSS and CUPID projects.

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

Celi, E.;Ferroni, F.;Marini, L.;Pagnanini, L.;Puiu, A.;
2021

Abstract

A scintillating bolometer based on a large cubic Li2 100MoO4 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 02 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 Li2 100MoO4 bolometer shows a high energy resolution of 6 keV FWHM at the 2615 keV line. The detection of scintillation light for each event triggered by the Li2 100MoO4 bolometer allowed for a full separation (∼8) between () and events above 2 MeV. The Li2 100MoO4 crystal also shows a high internal radiopurity with 228Th and 226Ra activities of less than 3 and 8 μBq/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 Li2 100MoO4 scintillating bolometers for high-sensitivity searches for the 100Mo 02 decay in CROSS and CUPID projects.
Cryogenic detectors; Double-beta decay detectors; Particle identification methods; Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators)
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12571/18241
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