How rare is cluster decay of superheavy nuclei?

Abstract

Superheavy nuclei produced until now are decaying by α emission and spontaneous fission (SF). For atomic numbers larger than 121 cluster decay (CD) has a good chance to compete. While the majority of calculated α decay (αD) half-lives are in agreement wiThexperimental data within one order of magnitude and CD are also very well accounted for, the discrepancy between theory and experiment can be as high as ten orders of magnitude for SF. Further improvement of accuracy comes from finding the optimal parameters of our models: analytical superasymmetric fission model, universal curve and semiempirical formula. For SF we study the nuclear dynamics based on potential barriers computed by the macroscopic-microscopic method and employing various nuclear inertia variation laws. Applications are illustrated for284Cn and even-even Z = 118 − 124 parent nuclei.