Local equilibration and diffusive phenomena in 40Ar + 27Al and 14N + 27Al heavy ion reactions

Extensive analysis of the energy dissipation and nucleon exchange has been done with heavier systems. Here we choose the two light systems 40Ar + 27Al(Esub(lab) = 340 MeV) and 14N + 27Al(Esub(lab) = 100 MeV) in order to study the correlation of the energy dissipation with the variance of the charge distributions as a function of total kinetic energy loss bins. Considerable energy damping is found to occur in the approach phase which cannot be explained by a simple Fokker-Planck diffusion model. Indeed a model which interprets the collision as a local equilibration followed by diffusive phenomena is more appropriate to fit the data. (orig.)