ZnWO4 crystals as detectors for double beta decay and dark matter experiments
F. A. Danevich, V. V. Kobychev, S. S. Nagorny, D. V. Poda, V. I. Tretyak, S. S. Yurchenko, Yu. G. Zdesenko
Abstract
Energy resolution, alpha/beta ratio, and the pulse shape discrimination ability of the ZnWO4 crystal scintillators were studied. The radioactive contamination of a ZnWO4 crystal was investigated in the Solotvina Underground Laboratory. Possibilities to apply ZnWO4 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 ECβ+ decay of 64-Zn as: T1/22nu > 8.9 1018 yr and T1/20nu > 3.6 1018 yr, both at 68% CL.
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