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Description
Heavy ion collisions provide a unique laboratory for studying nuclear matter under extreme conditions. The mid-rapidity region, characterized by particles emitted perpendicular to the beam axis, shows experimentally a neutron enrichment. The isospin transport processes and the density-dependent behaviour of the symmetry energy affect the transport of nucleons to this region of interaction between the projectile and the target. Therefore, theoretical models have been employed to characterize the Nuclear Equation of State by comparing the predictions with the experimental data.
The experiment was performed at GANIL (France). An 38Ar beam was accelerated to 74 A MeV and focused on a thin 56Ni target. The reaction products were detected by INDRA and FAZIA multi-detectors.
This paper aims to present the isotopic characteristics of particles and fragments emitted in the forward part of the centre of mass. It will be shown that the N/Z gradient between emissions at mid-velocity and those from the quasi-projectile is more complex than a simple neutron enrichment of all particles detected in the vicinity of the centre of mass.