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Title: Enriched TeO 2 bolometers with active particle discrimination: Towards the CUPID experiment

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.
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Publication Date:
Report Number(s):
LLNL-JRNL-705527
Journal ID: ISSN 0370-2693
Grant/Contract Number:
AC52-07NA27344; AC02-05CH11231; NA0000979; NA0003180
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 767; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); The Regents of the Univ. of California, Berkeley, CA (United States). Nuclear Science and Security Consortium
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Double beta decay; Bolometers; Isotope enrichment; Cherenkov emission; Neganov–Luke effect; 36 MATERIALS SCIENCE; double beta decay; bolometers; isotope enrichment; Neganov-Luke effect
OSTI Identifier:
1343780
Alternate Identifier(s):
OSTI ID: 1378500; OSTI ID: 1379804; OSTI ID: 1405149