Particle Discrimination in TeO${}_2$ Bolometers using Light Detectors read out by Transition Edge Sensors

Abstract

An active discrimination of the dominant $\alpha$-background is the prerequisite for future neutrinoless double-beta decay experiments based on TeO${}_2$ bolometers. We investigate such $\alpha$-particle rejection in cryogenic TeO${}_2$ bolometers by the detection of Cherenkov light. For a setup consisting of a massive TeO${}_2$ crystal (285 g) and a separate cryogenic light detector, both using transition edge sensors as temperature sensors operated at around 10 mK, we obtain an event-by-event identification of e/$\gamma$- and $\alpha$-events. We find in the energy interval ranging from 2400 keV to 2800 keV and covering the Q-value of the neutrinoless double-beta decay of ${}^{130}$Te a separation of the means of the two populations of 3.7 times their width.

arXiv comment8 pages, 7 figures

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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
• Background suppression in massive TeO${}_2$ bolometers with Neganov-Luke amplified light detectors
• Performance of a Large Area Photon Detector For Rare Event Search Applications
• A CsI low temperature detector for dark matter search
• The saga of neutrinoless double beta decay search with TeO2 thermal detectors
• First measurements of remoTES cryogenic calorimeters: easy-to-fabricate particle detectors for a wide choice of target materials
• Cryogenic light detectors with enhanced performance for rare events physics
• Cerenkov light identification with Si low-temperature detectors with Neganov-Luke effect-enhanced sensitivity
• Radiopure tungstate and molybdate crystal scintillators for double beta decay experiments
• Potentialities of the future technical improvements in the search of rare nuclear decays by bolometers
• Final results of CALDER: Kinetic inductance light detectors to search for rare events
• New application of superconductors: high sensitivity cryogenic light detectors