The γ -ray emissions from a radiopure cerium-bromide crystal with a mass of 4381 g were measured for a total of 497.4 d by means of high-resolution γ -ray spectrometry in the HADES underground laboratory at a depth of 500 m.w.e. A search for 0/2ν and 0/2νβ + double beta decay transitions of 136Ce and 138Ce was performed using Bayesian analysis techniques. No signals were observed for a total of 35 investigated decay modes. 90% credibility limits were set in the order of 1018–1019 yr. Existing constraints from a cerium oxide powder measurement were tested with a different cerium compound and half-life limits could be improved for most of the decay modes. The most likely accessible decay mode of the 136Ce 2ν transition into the 0+ 1 state of 136Ba results in a new best 90% credibility limit of 5.0 × 1018 yr.
LEHNERT B.;
HULT Mikael;
LUTTER Guillaume;
MARISSENS Gerd;
OBERSTEDT Stephan;
STROH Heiko;
KOTILA Jenni;
OBERSTEDT A.;
ZUBER K.;
2022-04-08
AMER PHYSICAL SOC
JRC126342
2469-9985 (online),
https://journals.aps.org/prc/abstract/10.1103/PhysRevC.105.045801,
https://publications.jrc.ec.europa.eu/repository/handle/JRC126342,
10.1103/PhysRevC.105.045801 (online),
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