Study of Quasi-Projectile Properties at Fermi Energies in 48ca Projectile Systems

The emission of the pre-equilibrium particles during nuclear collisions atmoderate beam energies is still an open question. This influences theproperties of the compound nucleus but also changes the interpretation of thequasi-fission process. A systematic analysis of the data obtained by the FAZIAcollaboration during a recent experiment with a neutron rich projectile ispresented. The full range of charged particles detected in the experiment iswithin the limit of isotopic resolution of the FAZIA detector. Quasi-projectile(QP) fragments were detected in majority thanks to the forward angularacceptance of the experimental setup which was confirmed by introducing cutsbased on the HIPSE event generator calculations. The main goal was to comparethe experimental results with the HIPSE simulations after introducing thesecuts to investigate the influence of the n-rich entrance channel on the QPfragment properties. More specifically, the lowering of N/Z of QP fragmentswith beam energy was found to be present since the initial phase of thereaction. Thus, pre-equilibrium emissions might be a possible candidate toexplain such an effect.