U-236における核分裂経路の有効相互作用依存性

The potential energy surface (PES) is one of the most important quantity to understand fission mechanisms. Valley in PES originating from the ground state defines the most-favorable path toward the scission. Microscopic models such as Hartree-Fock theory are known to be powerful tools to obtain the PES of fissionning nuclei. However, the effective interactions to be used in such calculations are normally determined to reproduce ground-state mass, deformation and radius, single-particle levels, properties of infinite nuclear matter, and so on. On the other hand, the fission barriers were not considered enough except for SKM* Skyrme interaction which was designed to reproduce fission barrier of Pu-240 and it is usually recognized that reproduction of fission barriers is not satisfactory for other systems. In this work, we tested 3 kinds of Skyrme effective interactions in terms of the Hartree-Fock+BCS method, and obtained PESs of U-236 (compound nucleus of n+U-235 system) up to scission configuration as a function of quadrupole and octupole deformations. From this calculation, we will elucidate the dependence of fission path on effective interactions, and afterward we will try to extract information which leads to properties of production of the fission fragments such as charge polarization and mass distribution.