Hadi Eslamizadeh

In the present thesis, we want to study the evolution of the excited nucleus 188Pt, which is created from the fusion reaction of 19F + 169Tm, within the framework of a modified statistical model using the parameters 𝑟s and α. At the beginning, we use the liquid drop model to obtain the characteristics of the fission barrier. Then, using the Fermi gas model, we determine the level density of the excited nucleus 188Pt. In the next step, utilizing specific parameters, we calculate the emission widths of light particles, gamma rays, and the fission width. Subsequently, by performing calculations and matching the computational data with experimental data, we obtain information about the fission probability and the cross-section for the survival of the compound nucleus after the emission of light particles. This allows us to determine the correction factor for the fission barrier height and the parameters 𝑟s and 𝛼. We will show that the appropriate values of these two parameters for the nucleus 188Pt are 𝑟𝑠 = 1.0005 ± 0.0020 𝑎𝑛𝑑 𝛼 = 0.0159 ± 0.0035. Finally, to demonstrate the capability of this model to predict various characteristics of the fission process, we estimate the number of neutrons emitted from compound nuclei before the fission process and show that the results satisfactorily match with experimental data