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Article Dans Une Revue Eur.Phys.J.C Année : 2023

Enhanced light signal as a powerful method to mitigate random coincidence background in double beta decay search with Mo-containing scintillating bolometers

I Bandac
  • Fonction : Auteur
J.M Calvo-Mozota
  • Fonction : Auteur
P Carniti
  • Fonction : Auteur
A. Ortiz de Solórzano
  • Fonction : Auteur
G Pessina
  • Fonction : Auteur

Résumé

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 $\sim$$10^{-4}$ counts/keV/kg/year with 280~g Li$_2$MoO$_4$ ($^{100}$Mo enriched) bolometers at 3034 keV, the Q-value of the double-beta decay, and target the goal of a next generation experiment like CUPID.

Dates et versions

hal-04020071 , version 1 (08-03-2023)

Identifiants

Citer

A Armatol, I Bandac, L Bergé, J.M Calvo-Mozota, P Carniti, et al.. Enhanced light signal as a powerful method to mitigate random coincidence background in double beta decay search with Mo-containing scintillating bolometers. Eur.Phys.J.C, 2023, 83 (5), pp.373. ⟨10.1140/epjc/s10052-023-11519-6⟩. ⟨hal-04020071⟩
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