Decay of dinuclear systems formed from dubnium.

The radioactivity of the superheavy nuclei 250 - 275 Db is studied and presented using the Coulomb and proximity potentials. The half-lives corresponding to different decay modes such as α , cluster decay ( 12 C, 14 N, 18 , 20 O, 23 F, 20 Ne, 34 S, 28 Mg and 40 Ca) and spontaneous fission in the superheavy nuclei 250 - 275 Db are studied. The studied half-lives are compared with the available experiments. The decay modes and the branching ratios of isotopes of dubnium are presented. The isotopes of dubnium, 254 - 263 Db, are identified as α emitters, whereas isotopes such as 250 - 253 Db and 264 - 275 Db are identified as having spontaneous fission. The identified alpha emitting isotopes of dubnium have decay energies from 6 MeV to 10 MeV and half-lives 1 ms to 100 s. The possible projectile–target combinations to synthesise the superheavy nuclei 253 - 263 Db were predicted. The fusion of spherical projectile and target yields larger evaporation residue cross-sections. [ABSTRACT FROM AUTHOR]