The computer code DECAY4 is developed to generate initial energy, time and angular distributions of particles emitted in radioactive decays of nuclides and nuclear (atomic) deexcitations. Data for description of nuclear and atomic decay schemes are taken from the ENSDF and EADL database libraries. The examples of use of the DECAY4 code in several underground experiments are described.

The indication for the α decay of 180 W with a half-life T

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Energy resolution, a=b ratio, and the pulse shape discrimination ability of the ZnWO 4 crystal scintillators were studied. The radioactive contamination of a ZnWO 4 crystal was investigated in the Solotvina Underground Laboratory. Possibilities to apply ZnWO 4 crystals for the dark matter and double beta decay searches are discussed. New improved half-life limits on double beta decay in zinc isotopes were established, in particular, for eb þ decay of 64 Zn as: T 2n 1=2 X8:9 Â 10 18 years and T 0n 1=2 X3:6 Â 10 18 years, both at 68% CL. r

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The 2β decay study of 160 Gd has been performed in the Solotvina Underground Laboratory with the help of Gd 2 SiO 5 :Ce crystal scintillator (volume 95 cm 3 ). The background of the detector in the vicinity of the Q ββ energy of 160 Gd was reduced to 1.0 cpd/keV·kg. The new improved half-life limits have been established for 0ν2β decay of 160 Gd to the ground (0 + ) and first excited (2 + ) levels of 160 Dy: T 0ν 1/2 ≥ 2.3(1.3)×10 21 yr at 68%(90%) C.L. The T 1/2 bounds have been also set for 2ν, 0νχ and 0νχχ modes of 160 Gd decay, as well as for different 2β decay processes in 136 Ce, 138 Ce and 142 Ce.

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