We will show some preliminary data, recently obtained by studying the nuclear reaction 48Ca+48Ca at 25 MeV/nucleon with the 4p detection system CHIMERA installed at LNS. The measurements is a part of a larger experimental project aimed to probe isospin degree of freedom in neutron rich and neutron poor systems at or below the saturation density [F. Amorini et al, Phys. Rev. Lett. 102 (2009)]. Inclusive data relative to well reconstructed events will be shown. In particular, charged particle multiplicity distributions, relative yields of Lithium and Beryllium isotopes and invariant cross section will be discussed.
We selected incomplete fusion phenomena in semi-central collisions by means of severe constraints on the observed charged particle multiplicity and on the experimental velocity of the largest detected fragments. For this class of events we performed mass and velocity distributions, in order to learn more about the mechanism of heavy residue production as well about the competition with other dissipative reactions (binary, ternary). The comparison of these preliminary data with previous distributions obtained for the reactions 40Ca+40,48Ca,46Ti, at the same bombarding energy of this report, confirms the strong influence of the N/Z degree of freedom on the fate of hot compound nuclei formed by means of incomplete fusion mechanisms at bombarding energies just at the threshold of the multi-fragmentation mechanism.