Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5495427 | Physics Letters B | 2017 | 9 Pages |
Abstract
We present the performances of two 92% enriched 130TeO2 crystals operated as thermal bolometers in view of a next generation experiment to search for neutrinoless double beta decay of 130Te. The crystals, 435 g each, show an energy resolution, evaluated at the 2615 keV γ-line of 208Tl, of 6.5 and 4.3 keV FWHM. The only observable internal radioactive contamination arises from 238U (15 and 8 μBq/kg, respectively). The internal activity of the most problematic nuclei for neutrinoless double beta decay, 226Ra and 228Th, 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.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
D.R. Artusa, F.T. III, J.W. Beeman, I. Dafinei, L. Dumoulin, Z. Ge, A. Giuliani, C. Gotti, P. de Marcillac, S. Marnieros, S. Nagorny, S. Nisi, C. Nones, E.B. Norman, V. Novati, E. Olivieri, D. Orlandi, L. Pagnanini, Y. Zhu,