https://doi.org/10.1140/epjc/s10052-016-4565-z
Regular Article - Experimental Physics
Rejection of randomly coinciding events in Li
scintillating bolometers using light detectors based on the Neganov–Luke effect
1
Institute for Nuclear Research, MSP 03680, Kyiv, Ukraine
2
CSNSM, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405, Orsay, France
3
DISAT, Università dell’Insubria, 22100, Como, Italy
4
CEA Saclay, DSM/IRFU, 91191, Gif-sur-Yvette Cedex, France
5
INFN, sezione di Roma, 00185, Rome, Italy
6
Presently at Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba, 277-8583, Japan
7
Presently at Max-Planck-Institut für Physik, 80805, Munich, Germany
* e-mail: andrea.giuliani@csnsm.in2p3.fr
Received:
9
June
2016
Accepted:
11
December
2016
Published online:
27
December
2016
Random coincidences of nuclear events can be one of the main background sources in low-temperature calorimetric experiments looking for neutrinoless double-beta decay, especially in those searches based on scintillating bolometers embedding the promising double-beta candidate 
Mo, because of the relatively short half-life of the two-neutrino double-beta decay of this nucleus. We show in this work that randomly coinciding events of the two-neutrino double-beta decay of Mo in enriched Li
detectors can be effectively discriminated by pulse-shape analysis in the light channel if the scintillating bolometer is provided with a Neganov–Luke light detector, which can improve the signal-to-noise ratio by a large factor, assumed here at the level of 
on the basis of preliminary experimental results obtained with these devices. The achieved pile-up rejection efficiency results in a very low contribution, of the order of 
counts/(keV
kgy), to the background counting rate in the region of interest for a large volume (
cm
) Li detector. This background level is very encouraging in view of a possible use of the Li solution for a bolometric tonne-scale next-generation experiment as that proposed in the CUPID project.
© The Author(s), 2016
