Semi-empirical formula for spontaneous fission half life time

A new semi-empirical formula is proposed for determining the spontaneous fission half lives, which works well for the mass region from 232Th to 286114. The computed spontaneous fission half life times are also compared with other semi-empirical formula predictions. The alpha decay half lives are systematically computed for heavy and super heavy region with proton numbers varying from 90⩽Z⩽122 using Coulomb and Proximity Potential Model. The comparison between computed alpha decay half lives and the present spontaneous fission semi-empirical formula predictions of even–even isotopes with Z=90–122 are studied. It is found that in super heavy region the isotopes 270–274Ds, 272–278112, 272–282114, 274–292116, 276–298118, 276–308120 and 278–314122 will survive fission and can be synthesized and identified via alpha decay.