Mokina V. Crystal scintillation detectors based on molybdate and tungstate for search of double beta-decay

The thesis presents works on optimization of crystals scintillation detectors based on molybdates and tungstates to search for double beta decay. It was first investigated of the relative light output and kinetics of scintillation signals for PbWO4, PbMoO4, ZnWO4 MgWO4 crystals in wide temperature range from room temperature to liquid helium and shown that this crystals scintillation perspective as cryogenic detectors to search for double beta decay. For the first time was systematically studied the influence of crystal forms, processing of surface shape and material of the reflector, the presence of optical contact with photomultiplier on the energy resolution and the relative signal amplitude with crystals scintillation ZnWO4 and CaWO4 to optimize efficiency of light collection in low temperature scintillation detectors to study double beta decay, finding dark matter, the study of rare alpha decays. The lead tungstate crysta scintillation from archaeological lead for use as lightguide for crystal scintillation cadmium tungstate with enriched isotope 106Cd in the lowbackground experiment to search of double beta decay of the isotope 106Cd was developed for the first time.