Calculatıon of Covarıance Matrıx and Cross-Sectıons of Some Nucleus for Neutron-Fıssıon Reactıons

In this study, neutron-fission cross sections were calculated for 232Th ,238Pu, 239Pu, 242Pu nucleus and data update technique is used for evaluated cross sections of this nucleus. Cross section calculations is constructed with ALİCE/ASH nuclear programme. Rotating finite range barrier sistematics and rotating liquid drop barrier sistematics was used by using the ALICE-ASH. Results obtained by changing the most important parameter of the fission cross sections af / an were fitted to experimental datas. Conclusions compared with available experimental values (EXFOR) and evaluated cross section librarys (ENDF, JENDL, MINKS). GANDR programme was used for data update technique. In section, a spline function to the experimental data was fitted by using least squares solution.