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Ahmine, A.; Armatol, A.; Bandac, I.; Bergé, L.; Calvo-Mozota, J. M.; Carniti, P.; Chapellier, M.; Dixon, T.; Dumoulin, L.; Giuliani, A.; Gras, Ph; Ferri, F.; Imbert, L.; Khalife, H.; Loaiza, P.; de Marcillac, P.; Marnieros, S.; Marrache-Kikuchi, C. A.; Nones, C.; Olivieri, E.; de Solórzano, A. Ortiz; Pessina, G.; Poda, D. V.; Redon, Th; Scarpaci, J. A.; Velázquez, M.; Zolotarova, A.
The European physical journal. C, Particles and fields, 05/2023, Letnik: 83, Številka: 5Journal Article
Abstract Random coincidences of events could be one of the main sources of background in the search for neutrino-less double-beta decay of $$^{100}$$ 100 Mo with macro-bolometers, due to their modest time resolution. Scintillating bolometers as those based on Li $$_2$$ 2 MoO $$_4$$ 4 crystals and employed in the CROSS and CUPID experiments can eventually exploit the coincident fast signal detected in a light detector to reduce this background. However, the scintillation provides a modest signal-to-noise ratio, making difficult a pile-up pulse-shape recognition and rejection at timescales shorter than a few ms. Neganov–Trofimov–Luke assisted light detectors (NTL-LDs) offer the possibility to effectively increase the signal-to-noise ratio, preserving a fast time-response, and enhance the capability of pile-up rejection via pulse shape analysis. In this article we present: (a) an experimental work performed with a Li $$_2$$ 2 MoO $$_4$$ 4 scintillating bolometer, studied in the framework of the CROSS experiment, and utilizing a NTL-LD; (b) a simulation method to reproduce, synthetically, randomly coincident two-neutrino double-beta decay events; (c) a new analysis method based on a pulse-shape discrimination algorithm capable of providing high pile-up rejection efficiencies. We finally show how the NTL-LDs offer a balanced solution between performance and complexity to reach background index $$\sim $$ ∼ $$10^{-4}$$ 10 - 4 counts/keV/kg/year with 280 g Li $$_2$$ 2 MoO $$_4$$ 4 ( $$^{100}$$ 100 Mo enriched) bolometers at 3034 keV, the Q $$_{\beta \beta }$$ β β of the double-beta decay, and target the goal of a next generation experiment like CUPID.
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