Complete event-by-event $\alpha/\gamma(\beta)$ separation in a full-size ${\mathrm{TeO}}_{2}$ CUORE bolometer by Neganov-Luke-magnified light detection
L. Bergé
(1)
,
M. Chapellier
(1)
,
M. de Combarieu
(2, 3)
,
L. Dumoulin
(1)
,
A. Giuliani
(1)
,
M. Gros
(4)
,
P. de Marcillac
(1)
,
S. Marnieros
(1)
,
C. Nones
(4)
,
V. Novati
(1)
,
E. Olivieri
(1)
,
B. Paul
(4)
,
D.V. Poda
(1)
,
T. Redon
(1)
,
B. Siebenborn
(5)
,
A.S. Zolotarova
(4, 6)
,
E. Armengaud
(4)
,
C. Augier
(7)
,
A. Benoît
(8)
,
J. Billard
(7)
,
A. Broniatowski
(1)
,
P. Camus
(9)
,
A. Cazes
(7)
,
F. Charlieux
(7)
,
M. de Jesus
(7)
,
K. Eitel
(5)
,
N. Foerster
(10)
,
J. Gascon
(7)
,
Y. Jin
(11)
,
A. Juillard
(7)
,
M. Kleifges
(12)
,
V. Kozlov
(10)
,
H. Kraus
(13)
,
V.A. Kudryavtsev
(14)
,
H. Le Sueur
(2, 15)
,
R. Maisonobe
(7)
,
X-F. Navick
(4, 16)
,
P. Pari
(2, 3)
,
E. Queguiner
(7)
,
S. Rozov
(17)
,
V. Sanglard
(7)
,
L. Vagneron
(7)
,
M. Weber
(12)
,
E. Yakushev
(17)
1
CSNSM -
Centre de Sciences Nucléaires et de Sciences de la Matière
2 SPEC - UMR3680 - Service de physique de l'état condensé
3 LC - Laboratoire de Cryogénie
4 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
5 EKP - Institut für Experimentelle Kernphysik [Karlsruhe]
6 DPhP - Département de Physique des Particules (ex SPP)
7 IPNL - Institut de Physique Nucléaire de Lyon
8 NEEL - HELFA - Hélium : du fondamental aux applications
9 NEEL - Cryo - Cryogénie
10 KIT - Karlsruhe Institute of Technology = Karlsruher Institut für Technologie
11 C2N - Centre de Nanosciences et de Nanotechnologies [Orsay]
12 IPE - Institut für Prozessdatenverarbeitung und Elektronik
13 Department of Physics [Oxford]
14 Department of Physics and Astronomy [Sheffield]
15 QUANTRONICS - Quantronics Group
16 DEDIP - Département d'Electronique, des Détecteurs et d'Informatique pour la Physique (ex SEDI)
17 DLNP - Dzhelepov Laboratory of Nuclear Problems [Dubna]
2 SPEC - UMR3680 - Service de physique de l'état condensé
3 LC - Laboratoire de Cryogénie
4 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
5 EKP - Institut für Experimentelle Kernphysik [Karlsruhe]
6 DPhP - Département de Physique des Particules (ex SPP)
7 IPNL - Institut de Physique Nucléaire de Lyon
8 NEEL - HELFA - Hélium : du fondamental aux applications
9 NEEL - Cryo - Cryogénie
10 KIT - Karlsruhe Institute of Technology = Karlsruher Institut für Technologie
11 C2N - Centre de Nanosciences et de Nanotechnologies [Orsay]
12 IPE - Institut für Prozessdatenverarbeitung und Elektronik
13 Department of Physics [Oxford]
14 Department of Physics and Astronomy [Sheffield]
15 QUANTRONICS - Quantronics Group
16 DEDIP - Département d'Electronique, des Détecteurs et d'Informatique pour la Physique (ex SEDI)
17 DLNP - Dzhelepov Laboratory of Nuclear Problems [Dubna]
E. Armengaud
- Fonction : Auteur
- PersonId : 980046
- IdRef : 117614165
H. Le Sueur
- Fonction : Auteur
- PersonId : 180518
- IdHAL : helene-le-sueur
Résumé
In the present work, we describe the results obtained with a large (≈133cm3) TeO2 bolometer, with a view to a search for neutrinoless double-β decay (0νββ) of Te130. We demonstrate an efficient α-particle discrimination (99.9%) with a high acceptance of the 0νββ signal (about 96%), expected at ≈2.5 MeV. 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 from the TeO2 detector, dominated by γ(β)-induced Cherenkov radiation but exhibiting also a clear scintillation component. The obtained results represent a major breakthrough toward the TeO2-based version of the CUORE Upgrade with Particle IDentification (CUPID), a ton-scale cryogenic 0νββ experiment proposed as a followup to the Cryogenic Underground Observatory for Rare Events (CUORE) project with particle identification. The CUORE experiment recently began a search for neutrinoless double-β decay of Te130 with an array of 988 125-cm3TeO2 bolometers. The lack of α discrimination in CUORE makes α decays at the detector surface the dominant background component, at the level of ≈0.01 counts/(keV kg y) in the region of interest. We show here, for the first time with a CUORE-size bolometer and using the same technology as CUORE for the readout of both heat and light signals, that surface α background can be fully rejected.