Fine structure in the intermediate resonance region of the neutron induced fission cross sectionM. Mirea1 and L. Tassan-Got2
1 Institute of Physics and Nuclear Engineering, 077125 Bucarest, Romania
2 Institut de Physique Nucléaire, 91406 Orsay Cedex, France
Published online: 21 May 2008
Recently, the fine structure of the 0.7 MeV resonance in the 230Th neutron-induced cross section was investigated within the hybrid model. A very good agreement with experimental data is obtained. It is suggested that fine structure of the cross section quantify the changes of the intrinsic states of the nucleus during the disintegration process. Due to internal excitations produced in the region of the outer barrier, where the density of single-particle states is enhanced, new transitions levels are produced. These transitions levels cause β-resonances very close in energy. A way to introduce phenomenologically this phenomenon in cross section calculations is presented.
© CEA 2008