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The data collected with a radioactively pure ZnWO$_4$ crystal scintillator(699 g) in low background measurements during 2130 h at the underground (3600 mw.e.) Laboratori Nazionali del Gran Sasso (INFN, Italy) were used to set alimit on possible concentration of superheavy eka-W (seaborgium Sg, Z = 106) inthe crystal. Assuming that one of the daughters in a chain of decays of theinitial Sg nucleus decays with emission of high energy $\alpha$ particle($Q_\alpha > 8$ MeV) and analyzing the high energy part of the measured$\alpha$ spectrum, the limit N(Sg)/N(W) < 5.5 $\times$ 10$^{-14}$ atoms/atom at90% C.L. was obtained (for Sg half-life of 10$^9$ yr). In addition, a limit onthe concentration of eka-Bi was set by analysing the data collected with alarge BGO scintillation bolometer in an experiment performed by another group[L. Cardani et al., JINST 7 (2012) P10022]: N(eka-Bi)/N(Bi) < 1.1 $\times$10$^{-13}$ atoms/atom with 90% C.L. Both the limits are comparable with thoseobtained in recent experiments which instead look for spontaneous fission ofsuperheavy elements or use the accelerator mass spectrometry.

Search for long-lived superheavy eka-tungsten with radiopure ZnWO$_4$ crystal scintillator