An active discrimination of the dominant a-background is the prerequisite for future neutrinoless dou- ble-beta decay experiments based on TeO2 bolometers. We investigate such a-particle rejection in cryo- genic TeO2 bolometers by the detection of Cherenkov light. For a setup consisting of a massive TeO2 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/c- and a-events. We find in the energy interval ranging from 2400 keV to 2800 keV and covering the Q-value of the neu- trinoless double-beta decay of 130Te a separation of the means of the two populations of 3.7 times their width.
Particle discrimination in TeO2 bolometers using light detectors read out by transition edge sensors / Schäffner, K; Angloher, G.; Bellini, Fabio; Casali, Nicola; Ferroni, Fernando; Hauff, D.; Nagorny, S. S.; Pattavina, L.; Petricca, F.; Pirro, S.; Pröbst, F.; Reindl, F.; Seidel, W.; Strauss, R.. - In: ASTROPARTICLE PHYSICS. - ISSN 0927-6505. - 69:(2015), pp. 30-36. [10.1016/j.astropartphys.2015.03.008]
Particle discrimination in TeO2 bolometers using light detectors read out by transition edge sensors
BELLINI, Fabio;CASALI, NICOLA;FERRONI, Fernando;
2015
Abstract
An active discrimination of the dominant a-background is the prerequisite for future neutrinoless dou- ble-beta decay experiments based on TeO2 bolometers. We investigate such a-particle rejection in cryo- genic TeO2 bolometers by the detection of Cherenkov light. For a setup consisting of a massive TeO2 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/c- and a-events. We find in the energy interval ranging from 2400 keV to 2800 keV and covering the Q-value of the neu- trinoless double-beta decay of 130Te a separation of the means of the two populations of 3.7 times their width.File | Dimensione | Formato | |
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Schäffner_Particle Discrimination_2015.pdf
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