We present the performances of two 92% enriched130TeO2crystals operated as thermal bolometers in view of a next generation experiment to search for neutrinoless double beta decay of130Te. The crystals, 435 g each, show an energy resolution, evaluated at the 2615 keV γ-line of208Tl, of 6.5 and 4.3 keV FWHM. The only observable internal radioactive contamination arises from238U (15 and 8 μBq/kg, respectively). The internal activity of the most problematic nuclei for neutrinoless double beta decay,226Ra and228Th, are both evaluated as <3.1 μBq/kg for one crystal and <2.3 μBq/kg for the second. Thanks to the readout of the weak Cherenkov light emitted by β/γ particles by means of Neganov–Luke bolometric light detectors we were able to perform an event-by-event identification of β/γ events with a 95% acceptance level, while establishing a rejection factor of 98.21% and 99.99% for α particles

Enriched TeO2bolometers with active particle discrimination: Towards the CUPID experiment

Pagnanini, L.;
2017

Abstract

We present the performances of two 92% enriched130TeO2crystals operated as thermal bolometers in view of a next generation experiment to search for neutrinoless double beta decay of130Te. The crystals, 435 g each, show an energy resolution, evaluated at the 2615 keV γ-line of208Tl, of 6.5 and 4.3 keV FWHM. The only observable internal radioactive contamination arises from238U (15 and 8 μBq/kg, respectively). The internal activity of the most problematic nuclei for neutrinoless double beta decay,226Ra and228Th, are both evaluated as <3.1 μBq/kg for one crystal and <2.3 μBq/kg for the second. Thanks to the readout of the weak Cherenkov light emitted by β/γ particles by means of Neganov–Luke bolometric light detectors we were able to perform an event-by-event identification of β/γ events with a 95% acceptance level, while establishing a rejection factor of 98.21% and 99.99% for α particles
Bolometers
Cherenkov emission
Double beta decay
Isotope enrichment
Neganov–Luke effect
Nuclear and High Energy Physics
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12571/6912
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