Abstract
The fission of many heavy nuclei shows a bimodal character, with both low and high-energy components in the kinetic energy distribution. These two components are thought to arise because the nucleus can choose two different paths to scission from the ground state; either a path leading to elongated scission shapes and low fission fragment kinetic energies or a path leading to the compact scission configuration of two touching spheres and high fission fragment kinetic energies. In the present paper we consider the second path. The vibration of the fragment surfaces leads to more realistic density distributions of the fragments. We consider that the neck density is responsible for the asymmetry and odd-even effects. Our results are compared with a large amount of experimental data in the cases of spontaneous fission of U, Pu, and Cf isotopes.
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