Isotope distribution in nuclear multifragmentation

A statistical multifragmentation model is used to analyze the isotope distribution of medium sized nuclei produced in p+Kr reactions at high bombarding energies. The results show that the evaporation processes narrow significantly the primordial hot fragment distributions and washes out almost completely the patterns associated with the isotope distributions in the primary fragments. Thus the calculation supports a scenario in which the formation of hot primary fragments is assumed. From adjustments to the experimental data an excitation energy per nucleon of the initial system is found to range from 3.5 to 7 MeV. (orig.)