Production and decay of excited quasiprojectiles in peripheral and semiperipheral Cl-35+Au-197 reactions in Fermi energy domain

The peripheral and semiperipheral reactions in Cl-35+Au-197 have been studi ed at 30 and 43 MeV/nucleon. The nonequilibrium ct and IMF components have been observed in the experiment. The fraction of nonequilibrium emission de creases with an increase in the atomic number of the projectile like fragme nts but, for a given projectile like fragment, it increases with the charge of the emitted particles. The characteristics of quasiprojectiles reconstr ucted from their decay products reveal several features reminiscent of damp ed reactions at lower bombarding energies. The atomic number and deflection angle of projectile like fragments depend strongly on their kinetic energy or dissipated energy. At 30 MeV/nucleon, the experimental data can be expl ained by a deep inelastic transfer model. One-body dissipation is still the main mechanism for the energy and angular momentum dissipation. However, a t 43 MeV/nucleon, deep inelastic transfer models can predict only the exper imental tendency. Two-body dissipation plays a more important role at highe r incident energies. The similarity observed in the decay product distribut ions, asa function of excitation energy, suggests that the excited quasipro jectiles formed in binary collisions might approach. thermal equilibrium fo r both incident energies. The decay products have been analyzed with sequen tial binary and simultaneous-disassembly statistical decay models. Both sta tistical models are able to provide good agreement with the experimental ob servables except for the mean kinetic energy of the products. [S0556-2813(9 9)05901-4].