Pre-scission model predictions of fission fragment mass distributions for super-heavy elements

摘要

AbstractThe total deformation energy just before the moment of neck rupture for the heaviest nuclei for which spontaneous fission has been detected (Ds279–281,Rg281andCn282–284) is calculated. The Strutinsky's prescription is used and nuclear shapes just before scission are described in terms of Cassinian ovals defined for the fixed value of elongation parameterα=0.98and generalized by the inclusion of four additional shape parameters:α1,α3,α4, andα6. Supposing that the probability of each point in the deformation space is given by Boltzmann factor, the distribution of the fission-fragment masses is estimated. The octupole deformationα3at scission is found to play a decisive role in determining the main feature of the mass distribution: symmetric or asymmetric. Only the inclusion ofα3leads to an asymmetric division. Finally, the calculations are extended to an unexplored region of super-heavy nuclei: the even–even Fl (Z=114), Lv (Z=116), Og (展开▼