Enhanced light signal for the suppression of pile-up events in Mo-based bolometers for the 0 νββ decay search.
Autor:
Ahmine, A.
; Armatol, A.
; Bandac, Iulian Catalin
; Bergé, L.
; Calvo-Mozota, Jose Maria
; 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.
Fecha:
2023Palabra clave:
Revista / editorial:
European Physical Journal CCitación:
Ahmine, A., Armatol, A., Bandac, I. et al. Enhanced light signal for the suppression of pile-up events in Mo-based bolometers for the 0 decay search.. Eur. Phys. J. C 83, 373 (2023). https://doi.org/10.1140/epjc/s10052-023-11519-6Tipo de Ítem:
Articulo Revista IndexadaResumen:
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.
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