Role of the pre-equilibrium particle emission in the ${}^{249-251}$No production in the ${}^{204}$Pb(${}^{48}$Ca, xn)${}^{252-x}$No reaction

Experimental data on the production of the ${}^{250}$No isotope in an isomeric state in the ${}^{204}$Pb(${}^{48}$Ca, 2n)${}^{250}$No reaction at ${}^{48}$Ca energies from 200 to 240 MeV are analyzed within a unified approach based on the Hauser-Feshbach model and Griffin’s exciton model for the description of nuclear reactions, assuming one pre-equilibrium particle emission. Here, we study the effect of pre-equilibrium processes on the production of No isotopes. It is found that the regard for the pre-equilibrium emission of light particles essentially (few orders of the magnitude) enhance description of the experimental data on the No production cross sections, in particular, the production of ${}^{250g,m}$No in the ground and isomeric states. This allows one to reproduce the incident energy dependence of residual-nuclei production.