CUPID-Mo is a bolometric experiment to search for neutrinoless double-beta decay (0νβ β ) of 100 Mo. In this article, we detail the CUPID-Mo detector concept, assema e-mail: andrea.giuliani@csnsm.in2p3.fr bly, installation in the underground laboratory in Modane in 2018, and provide results from the first datasets. The demonstrator consists of an array of 20 scintillating bolometers comprised of 100 Mo-enriched 0.2 kg Li 2 MoO 4 crystals. The
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