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A search for the double beta processes in 106Cd was carried out at the GranSasso National Laboratories of the INFN (Italy) with the help of a 106CdWO4crystal scintillator (215 g) enriched in 106Cd up to 66%. After 6590 h of datataking, new improved half-life limits on the double beta processes in 106Cdwere established at the level of 10^{19}-10^{21} yr; in particular,T_{1/2}(2\nu \epsilon \beta^+) > 2.1 10^{20} yr, T_{1/2}(2\nu 2\beta^+) > 4.310^{20} yr, and T_{1/2}(0\nu 2\epsilon) > 1.0 10^{21} yr. The resonantneutrinoless double electron captures to the 2718 keV, 2741 keV and 2748 keVexcited states of 106Pd are restricted to T_{1/2}(0\nu 2K) > 4.3 10^{20} yr,T_{1/2}(0\nu KL1) > 9.5 10^{20} yr and T_{1/2}(0\nu KL3) > 4.3 10^{20} yr,respectively (all limits at 90% C.L.). A possible resonant enhancement of the0\nu 2\epsilon processes is estimated in the framework of the QRPA approach.The radioactive contamination of the 106CdWO4 crystal scintillator is reported.

Search for double beta decay processes in 106Cd with the help of 106CdWO4 crystal scintillator