New limits on 2β processes in 106Cd

Tretyak, V I
Belli, P
Bernabei, R
Brudanin, V B
Cappella, F
Caracciolo, V
Cerulli, R
Chernyak, D M
Danevich, F A
d'Angelo, S
Di Marco, A
Incicchitti, A
Laubenstein, M
Mokina, V M
Poda, D V
Polischuk, O G
Tupitsyna, I A

Open link

Publication date

January 2016

DOI

10.1088/1742-6596/718/6/062062

Publisher

Institute of Physics Publishing

ISSN

1742-6588

Abstract

A radiopure cadmium tungstate crystal scintillator, enriched in 106 Cd to 66%, with mass of 216 g (106CdWO4) was used in coincidence with four ultra-low background HPGe detectors contained in a single cryostat to search for double beta (2β) decay processes in 106 Cd. New improved half-life limits on the 2β processes in 106 Cd have been set on the level of 1020 — 1021 yr after 13085 h of data taking deep underground (3600 m w.e.) at the Gran Sasso National Laboratories of INFN (Italy). In particular, the limit on the two neutrino electron capture with positron emission, Tεβ+2 1/2≥ 1.1 × 1021 yr, has reached the region of theoretical predictions. The resonant neutrinoless double electron captures to the 2718, 2741 and 2748 keV excited states ...