Li$_2$$^{100\textrm{depl}}$MoO$_4$ Scintillating Bolometers for Rare-Event Search Experiments

• DOI: 10.48550/arxiv.2304.13100
• Publication Date: 2023-01-01
• Authors: I. C. Bandac; A. S. Barabash; L. Bergé; Yu. A. Borovlev; J. M. Calvo-Mozota; P. Carniti; M. Chapellier; I. Dafinei; F. A. Danevich; L. Dumoulin; F. Ferri; A. Giuliani; C. Gotti; Ph. Gras; V. D. Grigorieva; A. Ianni; H. Khalife; V. V. Kobychev; S. I. Konovalov; P. Loaiza; M. Madhukuttan; E. P. Makarov; P. de Marcillac; S. Marnieros; Claire A. Marrach...; M. Martinez; C. Nones; E. Olivieri; A. Órtiz de Solór...; G. Pessina; D. V. Poda; T. Redon; J. A. Scarpaci; V. N. Shlegel; V. I. Tretyak; V. I. Umatov; M. M. Zarytskyy; A. Zolotarova
• Keywords: Crystal (programming language)

We report on the development of scintillating bolometers based lithium molybdate crystals containing molybdenum depleted in double-$\beta$ active isotope $^{100}$Mo (Li$_2$$^{100\textrm{depl}}$MoO$_4$). used two Li$_2$$^{100\textrm{depl}}$MoO$_4$ cubic samples, 45 mm side and 0.28 kg each, produced following purification crystallization protocols developed for search experiments with $^{100}$Mo-enriched Li$_2$MoO$_4$ crystals. Bolometric Ge detectors were utilized to register scintillation photons emitted by crystal scintillators. The measurements performed CROSS cryogenic set-up at Canfranc underground laboratory (Spain). observed that are characterized excellent spectrometric performance ($\sim$3--6 keV FWHM 0.24--2.6 MeV $\gamma$'s), moderate signal ($\sim$0.3--0.6 keV/MeV depending light collection conditions) high radiopurity ($^{228}$Th $^{226}$Ra activities below a few $\mu$Bq/kg), comparable best reported results low-temperature natural or content. Prospects use rare-event briefly discussed.