Abstract
Double beta processes in 64Zn, 70Zn, 180W, and 186W have been searched for with the help of low background ZnWO4 crystal scintillators at the Gran Sasso National Laboratories of the INFN (Italy). The total measurement time exceeds ten thousand hours. New improved half-life (T1/2) limits on double electron capture and electron capture with positron emission in 64Zn have been set. New T1/2 bounds were also set on different modes of 2β processes in 70Zn, 180W, and 186W. Future perspectives are considered.
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