Journal
PHYSICAL REVIEW C
Volume 93, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.93.045502
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Funding
- Joint Institute for Nuclear Research (Dubna) Promising Basic Research on High Energy and Nuclear Physics of the National Academy of Sciences of Ukraine
- [CO-1-2/2015]
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A radiopure cadmium tungstate crystal scintillator, enriched in Cd-106 to 66%, with mass of 216 g (Cd-106 WO4), was used to search for double-beta decay processes in Cd-106 in coincidence with four ultra-low-background high-purity germanium detectors in a single cryostat. Improved limits on the double-beta processes in Cd-106 have been set on the level of 10(20) - 10(21) yr after 13 085 h of data taking. In particular, the half-life limit on the two-neutrino electron capture with positron emission, T-1/2(2 nu epsilon beta+) >= 1.1 x 10(21) yr, has reached the region of theoretical predictions. With this half-life limit the effective nuclear matrix element for the 2 nu epsilon beta(+) decay is bounded as M-eff(2 nu epsilon beta+) <= 1.1. The resonant neutrinoless double-electron captures to the 2718-, 2741-, and 2748-keV excited states of Pd-106 are restricted at the level of T-1/2 >= (8.5 x 10(20) - 1.4 x 10(21)) yr.
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