CHARGE-DISTRIBUTION IN AR-40-159 REACTION AT 9.5 MEV(TB)NUCLEON/

Two models were applied to reproduce the experimentally obtained charg e distribution for Ar-40+Tb-159 system at 9.5 MeV/nucleon. They are ba sed on either random walk phenomena or on one body dissipative process es, The charge numbers of measured outgoing fragments were in the rang e of Z = 7 - 20. The model taking into account the differences in the density of final states of the heavier and lighter ions appeared to be suitable for the description of peripheral collisions. The drift of t he mass and charge is expected towards asymmetric division, producing ill the exit channel the projectile-like fragments lighter than the pr ojectile. In order to compare the model calculations with experimental data the statistical deexcitation of the primary hot fragments has be en taken into account. The succesfull description of the data by the p roposed model supplemented by statistical evaporation ilustrates the g reat importance of the phase space factors for directing the mass and charge flow in pheripheral and damped heavy ion collisions.