Background suppression in massive TeO${}_2$ bolometers with Neganov-Luke amplified light detectors

Abstract

Bolometric detectors are excellent devices for the investigation of neutrinoless double-beta decay (0$\nu \beta \beta$). 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 TeO${}_2$ is strongly limited by the alpha background in the region of interest for the 0$\nu \beta \beta$ of ${}^{130}$Te. It has been demonstrated that particle discrimination in TeO${}_2$ 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 TeO${}_2$ 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 TeO${}_2$-based 0$\nu \beta \beta$ experiment to an unprecedented level.

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Cited by in corpus (16)

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• Enriched TeO${}_2$ bolometers with active particle discrimination: towards the CUPID experiment
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• Complete event-by-event $\alpha$/$\gamma (\beta )$ separation in a full-size TeO${}_2$ CUORE bolometer by Neganov-Luke-magnified light detection
• Performance of a Large Area Photon Detector For Rare Event Search Applications
• Rejection of randomly coinciding events in Li${}_2$${}^{100}$MoO${}_4$ scintillating bolometers using light detectors based on the Neganov-Luke effect
• Charge-to-heat transducers exploiting the Neganov-Trofimov-Luke effect for light detection in rare-event searches
• The saga of neutrinoless double beta decay search with TeO2 thermal detectors
• Cryogenic light detectors with enhanced performance for rare events physics
• Cerenkov light identification with Si low-temperature detectors with Neganov-Luke effect-enhanced sensitivity
• Potentialities of the future technical improvements in the search of rare nuclear decays by bolometers
• Radiopurity of a kg-scale PbWO${}_4$ cryogenic detector produced from archaeological Pb for the RES-NOVA experiment
• Cryogenic phonon-scintillation detectors with PMT readout for rare event search experiments
• Characterization of Light Production and Transport in Tellurium Dioxide Crystals
• Online triggers for supernova and pre-supernova neutrino detection with cryogenic detectors