Symmetric and Asymmetric Scission Properties: Identical Shape Elongations of Fissioning Nuclei

Abstract

The shape elongation $\ensuremath{\beta}$ of a fissioning nucleus (of mass ${A}_{f}$) undergoing mass-symmetric and mass-asymmetric deformation is experimentally determined. The results indicate that, either for the mass-symmetric or for the mass-asymmetric deformation, the value of shape elongation is nearly independent of ${A}_{f}$ and temperature. Three types of shape elongations are observed: The liquid drop property governed mass-symmetric deformation with $\ensuremath{\beta}\ensuremath{\sim}1.65$; the mass-asymmetric deformation with $\ensuremath{\beta}\ensuremath{\sim}1.53$; and the shell influenced mass-symmetric deformation with $\ensuremath{\beta}\ensuremath{\sim}1.43$.