Isotopic yields and half-lives of 284Cn and 284Fl superheavy nuclei are calculated using nuclear proximity and Coulomb potentials. The energy released in fission, Q value, driving potential (V − Q), the penetrability through barrier, fission decay constant, and relative yield for each possible pair of fission fragments are obtained. According to the fragments mass and charge asymmetry, the most favored binary fragmentation is occurred for the highest Q value and the lowest driving potential. For spontaneous binary fission of 284Cn superheavy nuclei, the higher relative yields are belong to production of 128Sn and 134Te fragments and for 284Fl superheavy isotope, the maximum yield were observed for 136Xe as one of the fission fragments. The comparison between the obtained isotopic relative yield shows the role of magic and near-magic closed-shell fragments in having the highest isotopic yield. Fission decay constant for each possible fragmentation is calculated and then by summation over them, the total decay constant and fission half-life for 284Cn and 284Fl superheavy nuclei are estimated. Finally, the calculated half-lives using direct method are compared with the results of semiempirical formulas as well as experimental data. Satisfactory agreement is achieved between the results of this approach and the experimental data than the results of semiempirical formulas.
