/ physics.ins-det arXiv:1710.03459

Complete event-by-event $\alpha$/$\gamma(\beta)$ separation in a full-size TeO$_2$ CUORE bolometer by simultaneous heat and light detection

Bergé, L. (CSNSM, Orsay) ; Chapellier, M. (CSNSM, Orsay) ; de Combarieu, M. (IRFU, Saclay) ; Dumoulin, L. (CSNSM, Orsay) ; Giuliani, A. (Insubria U., Como) ; Gros, M. (AIM, Saclay) ; de Marcillac, P. (CSNSM, Orsay) ; Marnieros, S. (CSNSM, Orsay) ; Nones, C. (AIM, Saclay) ; Novati, V. (CSNSM, Orsay) ; Olivieri, E. (CSNSM, Orsay) ; Paul, B. (AIM, Saclay) ; Poda, D.V. (Kiev, INR) ; Redon, T. (CSNSM, Orsay) ; Siebenborn, B. (KIT, Karlsruhe, IKP) ; Zolotarova, A.S. (AIM, Saclay) ; Armengaud, E. (AIM, Saclay) ; Augier, C. (Lyon, IPN) ; Benoît, A. (Neel Lab, Grenoble) ; Billard, J. (Lyon, IPN) ; Broniatowski, A. (KIT, Karlsruhe, EKP) ; Camus, P. (Neel Lab, Grenoble) ; Cazes, A. (Lyon, IPN) ; Charlieux, F. (Lyon, IPN) ; De Jesus, M. (Lyon, IPN) ; Eitel, K. (KIT, Karlsruhe, IKP) ; Foerster, N. (KIT, Karlsruhe, EKP) ; Gascon, J. (Lyon, IPN) ; Jin, Y. (Unlisted, FR) ; Juillard, A. (Lyon, IPN) ; Kleifges, M. (KIT, Karlsruhe, IPE) ; Kozlov, V. (KIT, Karlsruhe, EKP) ; Kraus, H. (Oxford U.) ; Kudryavtsev, V.A. (Sheffield U.) ; Le Sueur, H. (CSNSM, Orsay) ; Maisonobe, R. (Lyon, IPN) ; Navick, X-F. (AIM, Saclay) ; Pari, P. (IRFU, Saclay) ; Queguiner, E. (Lyon, IPN) ; Rozov, S. (Dubna, JINR) ; Sanglard, V. (Lyon, IPN) ; Vagneron, L. (Lyon, IPN) ; Weber, M. (KIT, Karlsruhe, IPE) ; Yakushev, E. (Dubna, JINR)

Pages: 5

Abstract: The CUORE project began recently a search for neutrinoless double-beta decay ($0\nu\beta\beta$) 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 $0\nu\beta\beta$ of the order of 2.5 MeV). In the present work we demonstrate, for the first time with a CUORE-size (5$\times$5$\times$5 cm) TeO$_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 $0\nu\beta\beta$ 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 $\gamma$($\beta$)-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 $0\nu\beta\beta$ experiment proposed as a follow-up to CUORE with particle identification.

Web-Page: http://inspirehep.net/record/1629562/files/fig01a.png; http://inspirehep.net/record/1629562/files/fig04.png; http://inspirehep.net/record/1629562/files/fig02b.png; http://inspirehep.net/record/1629562/files/fig03.png; http://inspirehep.net/record/1629562/files/fig02a.png; http://inspirehep.net/record/1629562/files/fig01b.png; http://inspirehep.net/record/1629562/files/arXiv:1710.03459.pdf

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 Record created 2017-11-02, last modified 2017-11-02

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