Study of heavy ion fission fragment angular distribution using entrance channel mass asymmetry parameter (alpha)

For the study of heavy ion induced fission fragment angular distribution reaction in nuclei, which have alpha > alphabg, tsm statistical model is suitable and if alpha < alpha bc, ssm model is suitable. in ssm model, parameters a and ed are unknown. we use a new way to find these unknown parameters and apply it for reaction. in this way, we select a heavy ion reaction, which has a compound nucleus, and fission fragments of the same reaction. in addition, tsm model must be usable for this selected reaction. we calculate unknown parameters by using tsm model for the selected reaction then use known parameters and ssm model for reactions. then we use desired variances and calculate isph/^eff and x for both reactions. our results are in agreement with rossner et.al's results that are calculated for the same nuclei.