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25 April 2024

» arxiv » 1710.3459

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Complete event-by-event $alpha$/$gamma(eta)$ separation in a full-size TeO$_2$ CUORE bolometer by simultaneous heat and light detection
L. Bergé ; M. Chapellier ; M. de Combarieu ; L. Dumoulin ; A. Giuliani ; M. Gros ; P. de Marcillac ; S. Marnieros ; C. Nones ; V. Novati ; E. Olivieri ; B. Paul ; D.V. Poda ; T. Redon ; B. Siebenborn ; A.S. Zolotarova ; E. Armengaud ; C. Augier ; A. Benoît ; J. Billard ; A. Broniatowski ; P. Camus ; A. Cazes ; F. Charlieux ; M. De Jesus ; K. Eitel ; N. Foerster ; J. Gascon ; Y. Jin ; A. Juillard ; M. Kleifges ; V. Kozlov ; H. Kraus ; V.A. Kudryavtsev ; H. Le Sueur ; R. Maisonobe ; X-F. Navick ; P. Pari ; E. Queguiner ; S. Rozov ; V. Sanglard ; L. Vagneron ; M. Weber ; E. Yakushev ;
Date:	10 Oct 2017
Abstract:	The CUORE project began recently a search for neutrinoless double-beta decay ($0 uetaeta$) of $^{130}$Te with a $mathcal{O}$(1 ton) TeO$_2$ bolometer array. In this experiment, the background suppression relies essentially on passive shielding, material radiopurity and anti-coincidences. The lack of particle identification in CUORE makes $alpha$ decays at the detector surface the dominant background, at the level of $sim$0.01 counts/(keV kg y) in the region of interest ($Q$-value of $0 uetaeta$ of the order of 2.5 MeV). In the present work we demonstrate, for the first time with a CUORE-size (5$ imes$5$ imes$5 cm) TeO$_2$ bolometer and using the same technology as CUORE for the readout of the bolometric signals, an efficient $alpha$ particle discrimination (99.9\%) with a high acceptance of the $0 uetaeta$ signal (about 96\%). This unprecedented result was possible thanks to the superior performance (10 eV RMS baseline noise) of a Neganov-Luke-assisted germanium bolometer used to detect a tiny (70 eV) light signal dominated by $gamma$($eta$)-induced Cherenkov radiation in the TeO$_2$ detector. The obtained results represent a major breakthrough towards the TeO$_2$-based version of CUPID, a ton-scale cryogenic $0 uetaeta$ experiment proposed as a follow-up to CUORE with particle identification.
Source:	arXiv, 1710.3459
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