Random coincidences of events could be one of the main sources of background in the search for neutrino-less double-beta decay of 100 Mo with macro-bolometers, due to their modest time resolution. Scintillating bolometers as those based on Li 2 MoO 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 MoO 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 ∼ 10 - 4 counts/keV/kg/year with 280 g Li 2 MoO 4 (100 Mo enriched) bolometers at 3034 keV, the Q ββ of the double-beta decay, and target the goal of a next generation experiment like CUPID.

Ahmine, A., Armatol, A., Bandac, I., Bergé, L., Calvo-Mozota, J., Carniti, P., et al. (2023). Enhanced light signal for the suppression of pile-up events in Mo-based bolometers for the 0 νββ decay search. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 83(5) [10.1140/epjc/s10052-023-11519-6].

Enhanced light signal for the suppression of pile-up events in Mo-based bolometers for the 0 νββ decay search

Carniti P.;Pessina G.;
2023

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 Mo with macro-bolometers, due to their modest time resolution. Scintillating bolometers as those based on Li 2 MoO 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 MoO 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 ∼ 10 - 4 counts/keV/kg/year with 280 g Li 2 MoO 4 (100 Mo enriched) bolometers at 3034 keV, the Q ββ of the double-beta decay, and target the goal of a next generation experiment like CUPID.
Articolo in rivista - Articolo scientifico
bolometer; scintillating bolometer; light detection; pile-up; cryogenic calorimeter; Neganov-Trofimov-Luke effect
English
6-mag-2023
2023
83
5
373
open
Ahmine, A., Armatol, A., Bandac, I., Bergé, L., Calvo-Mozota, J., Carniti, P., et al. (2023). Enhanced light signal for the suppression of pile-up events in Mo-based bolometers for the 0 νββ decay search. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 83(5) [10.1140/epjc/s10052-023-11519-6].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/460804
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