Abstract
Central-like collisions have been singled out from inclusive proton spectra from reactions induced by 16O at 25.2 MeV nucleon and 58Ni at 15.1 solMeV nucleon on 27Al, 46Ti, 60Ni, 120Sn, 124Sn and 197Au by use of a refined multisource analysis. Angle-integrated spectra from these collisions have been compared with Boltzamann master-equation calculations. The obtained agreement is quite satisfactory. The role of collective effects in determining the initial number of effective degrees of freedom, n> 0, is investigated and an alternative explanation of the observed increase of n 0 with the target mass number is attempted. The excitation energy per effective degree of freedom, E ∗/n 0 , is found to be constant for a given projectile and to depend only on the per-nucleon bombarding energy.
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