EFFECT OF THE RATIO N Z IN A PROJECTILE ON THE DISTRIBUTION OF EXCITATION-ENERGY AMONG THE PRODUCTS OF DEEP-INELASTIC HEAVY-ION COLLISIONS/

The effect of the ratio N/Z in a projectile on the distribution of exc itation energy among the products of deep-inelastic heavy-ion collisio ns and on the variances and positions of maxima of charge and mass dis tributions of these products is studied in the microscopic approach. T he role of nucleon exchange and particle-hole excitations in the conve rsion of the kinetic energy of relative motion into internal nuclear e nergy is investigated. It is shown that in the reactions Ar-34,Ar-40,A r-46 + Cm-248, Ca-40,Ca-44,Ca-48,Ca-54 + Cm-248, and Ca-40,Ca-48 + U-2 38, excitation energy is about evenly divided between projectile-like and target-like nuclei. This distribution of excitation energy is inve stigated as a function of the mass number of the projectile isotope. N ucleon exchange between interacting nuclei is shown to be the principa l mechanism of kinetic-energy dissipation.