Pre-scission Model Predictions of Fission Fragment Mass Distributions for Super-heavy Elements
Résumé
The total deformation energy at the moment of the neck rupture for the heaviest nuclei for which SF has been detected (279–281Ds, 281Rg and 282–284Cn) is calculated using the Strutinsky’s prescription and nuclear shapes described in terms of Cassinian ovals (defined by an elongation parameter α=0.98) generalized by the inclusion of four additional shape parameters: α1, α3, α4, and α6. 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 deformation α3 at scission is found to play a decisive role in determining the main feature of the mass distribution: symmetric or asymmetric…