In this paper, Isotopic yield and half-lives of cold spontaneous fission for 279Ds and 281Ds superheavy isotopes are studied. The interacting potential between fragments includes mean field proximity and Coulomb potentials. Fission Q-value, driving potential, (V (r)−Q) and partial penetration probability of each possible individual fragmentation are calculated using WKB approximation. According to the tunneling effect, the most favored pair of fragments is produced for the highest Q-value or the lowest driving potential. A few fragmentation with higher Q-value are selected for each atomic number Z. It is found that for 279Ds isotope, the highest relative yield belongs to the 134Te + 145Ce fragmentation while for 281Ds, the combination 134Te + 137Ce has lowest driving potential and highest yield due to presence of fragments with magic or near magic proton and neutron numbers (Z = 50 and N = 82). By calculating yield of each fragmentation, its partial fission decay constant and then by summing over all decay constants for possible fragmentation, the fission decay constant for each superheavy isotope is obtained. Furthermore, half-life of each superheavy isotope is also estimated. Finally, the calculated half-lives using this method are compared with the experimental data. Good agreement achieved between our calculated half-lives and the experimental data.
