Test of <sup>116 CdWO<sub>4 and Li<sub>2 MoO<sub>4 scintillating bolometers in the CROSS underground facility with upgraded detector suspension

Ahmine, A. ; Bandac, I. C. ; Barabash, A. S. ; Berest, V. ; Bergé, L. ; Calvo-Mozota, J. M. ; Carniti, P. ; Chapellier, M. ; Dafinei, I. ; Danevich, F. A. ; Dixon, T. ; Dumoulin, L. ; Ferri, F. ; Giuliani, A. ; Gotti, C. ; Gras, P. ; Helis, D. L. ; Ianni, A. ; Imbert, L. ; Khalife, H. ; Kobychev, V. V. ; Konovalov, S. I. ; Loaiza, P. ; Marcillac, P. de ; Marnieros, S. ; Marrache-Kikuchi, C. A. ; Martinez, M. (Universidad de Zaragoza) ; Nones, C. ; Olivieri, E. ; Ortiz de Solórzano, A. (Universidad de Zaragoza) ; Peinaud, Y. ; Pessina, G. ; Poda, D.V. ; Redon, Th. ; Rosier, Ph. ; Scarpaci, J. A. ; Tretyak, V. I. ; Umatov, V. I. ; Velázquez, M. ; Zarytskyy, M. M. ; Zolotarova, A.

Resumen: In preparation for the CROSS experiment to search for double-beta (2β) decay of 100Mo, we upgraded a low-background facility at the Canfranc underground laboratory (Spain) by installing a magnetic damping-based detector suspension inside a pulse-tube cryostat. We tested the suspension in low-temperature (15 mK) measurements with two scintillating bolometers made of large-volume crystals of 116CdWO4(reference of the set-up) and Li2MoO4 (R&D; of the CLYMENE project in view of the CUPID 2β experiment), each coupled to a thin Ge bolometric light detector. Despite the evidence of a residual pulse-tube-induced noise, picked up by cabling, we achieved high performance with all tested devices. In particular, the energy resolution for 2615 keV γ-ray measured with both116CdWO4 and Li2MoO4 bolometers is ∼6 keV FWHM, among the best-reported results for thermal detectors based on such compounds representing a great interest to searches for 2β decay in 116Cd (Q-value is 2813 keV) and 100Mo (3034 keV) respectively. Highly efficient particle identification (α vs. β/γ) is achieved also with the scintillating bolometer made of a low light yield crystal (Li2MoO4), thanks to the low noise (10 eV RMS) exhibited by the light detector exploiting the Neganov-Trofimov-Luke effect for signal amplification. We also found a rather high level of radiopurity in the Li2MoO4 crystal; only traces of 210Po and 226Ra were detected (∼0.1 mBq/kg each), while the228Th activity is expected to be at least an order of magnitude lower, as well as a 40K activity is below 6 mBq/kg.

Idioma: Inglés

DOI: 10.1088/1748-0221/18/12/P12004

Año: 2023

Publicado en: Journal of Instrumentation 18, 12 (2023), P12004 [22 pp.]
ISSN: 1748-0221

Factor impacto JCR: 1.3 (2023)

Categ. JCR: INSTRUMENTS & INSTRUMENTATION rank: 57 / 76 = 0.75 (2023) - Q3 - T3

Factor impacto CITESCORE: 2.4 - Mathematical Physics (Q2) - Instrumentation (Q3)

Factor impacto SCIMAGO: 0.58 - Mathematical Physics (Q2) - Instrumentation (Q2)

Financiación: info:eu-repo/grantAgreement/EC/H2020/742345/EU/Cryogenic Rare-event Observatory with Surface Sensitivity/CROSS

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Técnica. Lab. y Talleres (Dpto. Física Teórica)
Área (Departamento): Área Física Atóm.Molec.y Nucl. (Dpto. Física Teórica)