Bolometric detectors are excellent devices for the investigation of neutrinoless double-beta decay (0νββ). The observation of such decay would demonstrate the violation of lepton number, and at the same time it would necessarily imply that neutrinos have a Majorana character. The sensitivity of cryogenic detectors based on TeO2 is strongly limited by the alpha background in the region of interest for the 0νββ of 130Te. It has been demonstrated that particle discrimination in TeO2 bolometers is possible measuring the Cherenkov light produced by particle interactions. However an event-by-event discrimination with NTD-based light detectors has to be demonstrated. We will discuss the performance of a highly-sensitive light detector exploiting the Neganov-Luke effect for signal amplification. The detector, being operated with NTD-thermistor and coupled to a 750 g TeO2 crystal, shows the ability for an event-by-event identification of electron/gamma and alpha particles. The extremely low detector baseline noise, RMS 19 eV, demonstrates the possibility to enhance the sensitivity of TeO2-based 0νββ experiment to an unprecedented level.
Pattavina, L., Casali, N., Dumoulin, L., Giuliani, A., Mancuso, M., de Marcillac, P., et al. (2016). Background Suppression in Massive TeO 2 Bolometers with Neganov–Luke Amplified Light Detectors. JOURNAL OF LOW TEMPERATURE PHYSICS, 184(1), 286-291 [10.1007/s10909-015-1404-9].
Background Suppression in Massive TeO 2 Bolometers with Neganov–Luke Amplified Light Detectors
Pattavina, L
;
2016
Abstract
Bolometric detectors are excellent devices for the investigation of neutrinoless double-beta decay (0νββ). The observation of such decay would demonstrate the violation of lepton number, and at the same time it would necessarily imply that neutrinos have a Majorana character. The sensitivity of cryogenic detectors based on TeO2 is strongly limited by the alpha background in the region of interest for the 0νββ of 130Te. It has been demonstrated that particle discrimination in TeO2 bolometers is possible measuring the Cherenkov light produced by particle interactions. However an event-by-event discrimination with NTD-based light detectors has to be demonstrated. We will discuss the performance of a highly-sensitive light detector exploiting the Neganov-Luke effect for signal amplification. The detector, being operated with NTD-thermistor and coupled to a 750 g TeO2 crystal, shows the ability for an event-by-event identification of electron/gamma and alpha particles. The extremely low detector baseline noise, RMS 19 eV, demonstrates the possibility to enhance the sensitivity of TeO2-based 0νββ experiment to an unprecedented level.
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