Journal
PHYSICS LETTERS B
Volume 767, Issue -, Pages 321-329Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2017.02.011
Keywords
Double beta decay; Bolometers; Isotope enrichment; Cherenkov emission; Neganov-Luke effect
Funding
- LUCIFER experiment - European Research Council under the Seventh Framework Programme (FP7) ERC Grant [247115]
- Italian Ministry of Research [PRIN 2010ZXAZK9]
- US National Science Foundation [0605119, 1307204]
- National Natural Science Foundation of China [51302287, 61405229]
- US Department of Energy National Nuclear Security Administration [DE-NA0000979]
- US Department of Energy by LLNL [DE-AC52-07NA27344]
- LUMINEU program from the Agence Nationale de la Recherche (France)
- Direct For Mathematical & Physical Scien
- Division Of Physics [1307204, 0605119] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1614611] Funding Source: National Science Foundation
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We present the performances of two 92% enriched (TeO2)-Te-130 crystals operated as thermal bolometers in view of a next generation experiment to search for neutrinoless double beta decay of Te-130. The crystals, 435 g each, show an energy resolution, evaluated at the 2615keV gamma-line of Tl-208, of 6.5 and 4.3keV FWHM. The only observable internal radioactive contamination arises from U-238 (15 and 8 mu Bq/kg, respectively). The internal activity of the most problematic nuclei for neutrinoless double beta decay, Ra-226 and Th-228, are both evaluated as < 3.1 mu Bq/kg for one crystal and < 2.3 mu Bq/kg for the second. Thanks to the readout of the weak Cherenkov light emitted by beta/gamma particles by means of Neganov-Luke bolometric light detectors we were able to perform an event-by-event identification of beta/gamma events with a 95% acceptance level, while establishing a rejection factor of 98.21% and 99.99% for alpha particles. (C) 2017 The Authors. Published by Elsevier B.V.
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