حسین فالی نژاد

Generally two parameters rB and af/an have been used for simulation of the fission process of the excited nuclei in the framework statistical models. Recently Lestion introduced two new parameters rs and landa that we can better simulate the fission process of the excited nuclei. in the present research we wants to simulate the fission process of 197 Tl and calculate The anisotropy of fission fragment angular distribution, evaporation residue cross section and the fission cross section were calculated for 197Tl formed in 16O 181Ta reactions in the framework of the modified statistical model and results compared with the experimental data. The effects of temperature and projection of spin about the symmetry axis, K, have been considered in calculations of the potential energy surfaces and the fission widths. It was shown that in the framework of the modified statistical model by choosing appropriate values for the temperature coefficient of the effective potential, , and the scaling factor of the fission-barrier height, , can be satisfactorily reproduced the above mentioned experimental data. It was also shown that the appropriate values of these parameters for 197Tl