|author(s)||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, M. Chapellier, F. Charlieux, D. M. Chernyak, M. de Combarieu, N. Coron, F. A. Danevich, I. Dafinei, M. De Jesus, L. Devoyon, S. Di Domizio, L. Dumoulin, K. Eitel, C. Enss, F. Ferroni, A. Fleischmann, N. Foerster, J. Gascon, L. Gastaldo et al., ...|
|title||Development of 100Mo-containing scintillating bolometers for a high-sensitivity neutrinoless double-beta decay search|
|source||Eur. Phys. J. C 77, 785 (2017)|
This paper reports on the development of a tech- nology involving 100Mo-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 100Mo-containing zinc and lithium molybdate crystals have been produced and used to develop high perfor- mance single detector modules based on 0.2–0.4 kg scintil- lating bolometers. In particular, the energy resolution of the lithium molybdate detectors near the Q-value of the double- beta transition of 100Mo (3034 keV) is 4–6 keV FWHM. The rejection of the α-induced dominant background above 2.6 MeV is better than 8σ . Less than 10 μBq/kg activity of 232Th (228Th) and 226Ra in the crystals is ensured by boule recrystallization. The potential of 100Mo-enriched scintillat- ing 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 100Mo has been measured with the up-to-date highest accuracy as T1/2 = [6.90 ± 0.15(stat.) ± 0.37(syst.)] × 1018 years. Both crystal- lization and detector technologies favor lithium molybdate, which has been selected for the ongoing construction of the CUPID-0/Mo demonstrator, containing several kg of 100Mo.