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Development of 100 Mo -containing scintillating bolometers for a high-sensitivity neutrinoless double-beta decay search

Development of 100 Mo -containing scintillating bolometers for a high-sensitivity neutrinoless double-beta decay search

E Armengaud, C Augier, A S Barabash, J W Beeman, T B Bekker, F Bellini, A Benoît, L Bergé, T Bergmann, J Billard, R S Boiko, A Broniatowski, V Brudanin, P Camus, S Capelli, L Cardani, N Casali, A Cazes, etc.

Eur Phys J C Part Fields. 2017;77(11):785.

PMID: 31997932

Abstract:

This paper reports on the development of a technology involving 100 Mo -enriched scintillating bolometers, compatible with the goals of CUPID, a proposed next-generation bolometric experiment to search for neutrinoless double-beta decay. Large mass ( ∼ 1 kg ), high optical quality, radiopure 100 Mo -containing zinc and lithium molybdate crystals have been produced and used to develop high performance single detector modules based on 0.2-0.4 kg scintillating bolometers. In particular, the energy resolution of the lithium molybdate detectors near the Q-value of the double-beta transition of 100 Mo (3034 keV) is 4-6 keV FWHM. The rejection of the α -induced dominant background above 2.6 MeV is better than 8 σ . Less than 10 μ Bq/kg activity of 232 Th ( 228 Th ) and 226 Ra in the crystals is ensured by boule recrystallization. The potential of 100 Mo -enriched scintillating bolometers to perform high sensitivity double-beta decay searches has been demonstrated with only 10 kg × d exposure: the two neutrino double-beta decay half-life of 100 Mo has been measured with the up-to-date highest accuracy as T 1 / 2 = [6.90 ± 0.15(stat.) ± 0.37(syst.)] × 10 18 years . Both crystallization and detector technologies favor lithium molybdate, which has been selected for the ongoing construction of the CUPID-0/Mo demonstrator, containing several kg of 100 Mo .

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP13568406	Lithium molybdate		13568-40-6	Price

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