Can be achieved a more accuracy in neutron cross section calculation at low energies?

The role of some approximations that traditionally are used in the calculation of neutron inelastic cross section for nuclei in the mass region 48≤A≤64 is analyzed. It is shown, that the use of different optical potential parameters for ground and first excited states causes a contribution of more than 10% on the cross section. In the description of the structure of ''soft'' nuclei, the effect of anharmonicities is considered. This effect has a notable contribution to the cross section near the threshold at low energies. For better description of the experimental data in 48Ti(n,n') process, the multichannel coupled model is used. (author). 42 refs, 20 figs, 8 tabs