Direct and compound interactions for the neutron-induced fission cross section determination

Recent ratio surrogate data for the neutron-induced fission cross sections are inter-compared for the chain of Th and U nuclides. The structure of the fission barrier and the angular moments of the entrance channel states are shown to be significant. The excitation/position of the K-pi = 2(+) abnormal rotational band-head at the inner saddle of even-even U fissioning nuclide like U-240 is shown to be critically important. At Th-231 nuclide medium excitations of 10-20 MeV, when pre-fission neutron emission is possible in the reaction Th-232(He-3, He-4), the excitation of K-pi = 0(-) states depends on the mass-asymmetry of the even nuclide Th-230 saddle shapes. Octupole band states are shown to be relevant for the Th-232(He-3, He-3') reaction. The consistency of surrogate, ratio surrogate and neutron-induced fission data is revisited.