Development and refinement of an applicable, realistic version of the multistep compound reaction MSCR model for analysis of fast neutron cross sections needed for science and technology

The theory of Feshbach-Kerman-Koonin has been applied for the calculations of preequilibrium particle emission in neutron initiated reactions with sequence of Mo-isotopes. It is supposed that the multistep compound interaction chain involves doorway-states containing bound particle orbitals. The bound-particle-hole state densities are used to derive the densities of states accessible in the transition modes contributing to the preequilibrium emission. Angular momentum dependence of transition and damping widths is taken into account. These features were introduced into EMPIRE code. Calculation of (n,2n) cross sections for Mo-isotopes with the non-closed shell and magic neutron number nucleus shows problems in description of cross sections combining multistep compound and direct processes