This paper reports on the development of a technology involving100Mo -enriched scintillating bolometers, compatible with the goals of CUPID, a proposed next-generation bolometric experiment to search for neutrinoless double-beta decay. Large mass (â¼1kg), high optical quality, radiopure100Mo -containing zinc and lithium molybdate crystals have been produced and used to develop high performance single detector modules based on 0.2â0.4Â kg scintillating bolometers. In particular, the energy resolution of the lithium molybdate detectors near the Q-value of the double-beta transition of100Mo (3034Â keV) is 4â6Â keV FWHM. The rejection of the Î±-induced dominant background above 2.6Â MeV is better than 8 Ï. Less than 10Î¼Bq/kg activity of 232Th(228Th) and226Ra in the crystals is ensured by boule recrystallization. The potential of100Mo -enriched scintillating bolometers to perform high sensitivity double-beta decay searches has been demonstrated with only 10kgÃd exposure: the two neutrino double-beta decay half-life of100Mo has been measured with the up-to-date highest accuracy as T1 / 2= [6.90 Â± 0.15(stat.) Â± 0.37(syst.)] Ã1018years. 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 of100Mo.
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|Titolo:||Development of100Mo -containing scintillating bolometers for a high-sensitivity neutrinoless double-beta decay search|
|Data di pubblicazione:||2017|
|Appare nelle tipologie:||01.01 - Articolo su rivista|