Entrance channel effects and the formation of hot nuclei

With an improved Boltzmann-Uehling-Uhlenbeck code, we have calculated the excitation energies and the angular momenta of heavy residues formed in 40Ar+27Al collisions. At E/A≥35MeV, the maximum residue angular momenta are predicted to be significantly smaller than the static limits predicted by the liquid drop model. The excitation energy of residues produced in central collisions is predicted to increase with incident energy, reaching a vale of about 5-6 MeV/nucleon at E/A=40 MeV. (orig.)