Enriched TeO\(_2\) bolometers with active particle discrimination: towards the CUPID experiment
We present the performances of two 92% enriched \(^{130}\)TeO\(_2\) crystals operated as thermal bolometers in view of a next generation experiment to search for neutrinoless double beta decay of \(^{130}\)Te. The crystals, 435 g each, show an energy resolution, evaluated at the 2615 keV \(\gamma\)-...
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Published in | arXiv.org |
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Main Authors | , , , , , , , , , , , , , , , , , , , , , , , , , |
Format | Paper |
Language | English |
Published |
Ithaca
Cornell University Library, arXiv.org
10.10.2016
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Subjects | |
Online Access | Get full text |
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Summary: | We present the performances of two 92% enriched \(^{130}\)TeO\(_2\) crystals operated as thermal bolometers in view of a next generation experiment to search for neutrinoless double beta decay of \(^{130}\)Te. The crystals, 435 g each, show an energy resolution, evaluated at the 2615 keV \(\gamma\)-line of \(^{208}\)Tl, of 6.5 and 4.3 keV FWHM. The only observable internal radioactive contamination arises from \(^{238}\)U (15 and 8 \(\mu\)Bq/kg, respectively). The internal activity of the most problematic nuclei for neutrinoless double beta decay, \(^{226}\)Ra and \(^{228}\)Th, 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. |
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ISSN: | 2331-8422 |
DOI: | 10.48550/arxiv.1610.03513 |