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Double beta processes in 64 Zn, 70 Zn, 180 W, and 186 W have been searched for with the help of large volume (0.1–0.7 kg) low background ZnWO 4 crystal scintillators at the Gran Sasso National Laboratories of the INFN (Italy). The total measurement time exceeds ten thousand hours. New improved half-life limits on double electron capture and electron capture...
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