Statistical Model of Heavy-Ion Fusion-Fission Reactions

Abstract

Cross-section and neutron-emission data from heavy-ion fusion-fission reactions are consistent with the fission of fully equilibrated systems with fission lifetime estimates obtained via a Kramers-modified statistical model which takes into account the collective motion of the system about the ground state, the temperature dependence of the location and height of fission transition points, and the orientation degree of freedom. If the standard techniques for calculating fission lifetimes are used, then the calculated excitation-energy dependence of fission lifetimes is incorrect. We see no evidence to suggest that the nuclear viscosity has a temperature dependence. The strong increase in the nuclear viscosity above a temperature of approximately 1.3 MeV deduced by others is an artifact generated by an inadequate fission model.

Full paper submitted to PRC to accompany our recently published Phys. Rev. Lett. 101, 032702 (2008)

References in corpus (2)

• Fission Decay Widths for Heavy-Ion Fusion-Fission Reactions
• Black-body photon clustering by semi-classical means

Cited by in corpus (12)

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• Microscopic dynamical description of proton-induced fission with the Constrained Molecular Dynamics (CoMD) Model
• Shear viscosity of nucleonic matter
• Alleviating the inconsistencies in modelling decay of fissile compound nuclei
• Quest for consistent modelling of statistical decay of the compound nucleus
• Influence of fusion dynamics on fission observables: A multi-dimensional analysis
• Temperature dependence of nuclear fission time in heavy-ion fusion-fission reactions
• Search for stabilizing effects of $\mathbf{Z}=82$ shell closure against fission
• Investigating the fission dynamics of the following neutron shell closed nuclei within a stochastic dynamical approach: 210Po, 212Rn, and 213Fr