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The gamma-ray emissions from a radiopure cerium-bromide crystal with a massof 4381 g were measured for a total of 497.4 d by means of high-resolutiongamma-ray spectrometry in the HADES underground laboratory at a depth of 500m.w.e. A search for 0/2nee and 0/2neb+ double beta decay transitions of Ce-136and Ce-138 was performed using Bayesian analysis techniques. No signals wereobserved for a total of 35 investigated decay modes. 90% credibility limitswere set in the order of 1e18-1e19 a. Existing constraints from a cerium oxidepowder measurement were tested with a different cerium compound and half-lifelimits could be improved for most of the decay modes. The most likelyaccessible decay mode of the Ce-136 2nee transition into the 0+1 state ofBa-136 results in a new best 90% credibility limit of 5.0e18 a.

Constraints on partial half-lives of Ce-136 and Ce-138 double electron captures