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Double beta processes in 64 Zn were searched for with the help of a low background ZnWO 4 crystal scintillator (mass of 117 g) at the Gran Sasso National Laboratories of the INFN. Total time of measurements was 1902 h. New improved half-life limits on different modes of double electron capture and electron capture with positron emission were established as: T1/22ν2K⩾6.2×1018 yr, T1/20ν2K⩾4...
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