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Radiopure ZnWO 4 crystal scintillators with mass (0.1-0.7 kg) have been developed and put in measurement in the Gran Sasso National Laboratories of the INFN to search for rare processes. The radioactive contamination of the crystals have been estimated and the double beta decay of zinc and tungsten isotopes was searched for, reaching a sensitivity at the level of 10 18 − 10 21 yr; in addition a new half-life limit on alpha transition of 183 W to the metastable excited level of 179 Hf has alsodoi:10.1051/epjconf/20136501002 fatcat:n3kuxnqwxvcy5ari7zliuoka34