Search for double beta decay of Zinc and Tungsten with the help of   low-background ZnWO4 crystal scintillators
  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 ZnWO4 crystal scintillators at the Gran Sasso National Laboratories of the INFN. Total time of measurements exceeds 10 thousands hours. New improved half-life limits on double electron capture and electron capture with positron emission in 64-Zn have been set, in particular (all the limits are at 90% C.L.): T1/2(0nu2EC)> 1.1e20 yr, T1/2(2nuECbeta+)>7.0e20 yr, and T1/2(0nuECbeta+)>4.3e20 yr. The different modes of double beta processes in 70-Zn, 180-W, and 186-W have been restricted at the level of 1e17-1e20 yr. 
P.Belli, R.Bernabei, F.Cappella, R.Cerulli, F.A.Danevich, B.V.Grinyov,   A.Incicchitti, V.V.Kobychev, V.M.Mokina, S.S.Nagorn...