Axial asymmetry and mass asymmetry at the scission point
In order to study the influence of deviations from axial symmetry on the potential energy at scission, the usual two-spheroid scission configuration has been extended to tri-axial ellipsoids. The (controversial) adiabatic assumption has been avoided by adjusting all BETA -values to experimental data. Numerical results are given for twenty mass divisions of 236U. Although it is found that the effect of non-axial deformations on the potential energy strongly depends on the mass asymmetry of the nucleus a nonaxial shape is energetically favored ln only one fission mode. Even in this case, the energy gain due to deviations from axial symmetry is small. Thus the assumption of axial symmetry in previous quasi-static calculations of kinetic and excitation energies of the fragments is justified. Fission fragments at scission can be classified as soft or stiff according to their stiffness against gamma -deformation. From this it follows that non-axial deformations in necked-in nuclei should be described by two independent shape parameters, one for each fragment.
- Research Organization:
- Univ., Munich
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-29-004076
- OSTI ID:
- 4413488
- Journal Information:
- Nuclear Physics. A, Journal Name: Nuclear Physics. A Journal Issue: 2 Vol. 215; ISSN 0375-9474
- Publisher:
- Elsevier
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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