Role of the pre-equilibrium particle emission in the 249-251No production in the 204Pb(48Ca, xn)252-xNo reaction
Abstract
Experimental data on the production of the 250No isotope in an isomeric state in the 204Pb(48Ca, 2n)250No reaction at 48Ca 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,mNo in the ground and isomeric states. This allows one to reproduce the incident energy dependence of residual-nuclei production.
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