Abstract
A search for double processes in Cd was carried out at the Gran Sasso National Laboratories of the INFN (Italy) with the help of a CdWO crystal scintillator (215 g) enriched in Cd up to 66. After 6590 h of data taking, new improved half-life limits on the double decay processes in Cd were established at the level of – yr; in particular, yr, yr, and yr. The resonant neutrinoless double-electron captures to the 2718-, 2741-, and 2748-keV excited states of Pd are restricted to yr, yr, and yr, respectively (all limits at 90 confidence level). A possible resonant enhancement of the processes is estimated in the framework of the quasiparticle random phase approximation (QRPA) approach. Radioactive contamination of the CdWO crystal scintillator is reported.
3 More- Received 11 September 2011
DOI:https://doi.org/10.1103/PhysRevC.85.044610
©2012 American Physical Society