Isospin physics by CHIMERA detector

This contribution presents some recent results relative to the studies of isospin-asymmetric nuclear matter in experiments using the 4p detector CHIMERA and the beams delivered by the Superconductive Cyclotron at INFN-Laboratori Nazionali del Sud in Catania. In particular, we report the results of the experiments named "Reverse" and "Isodec", both included in the EXOCHIM activity supported by the CNSIII of INFN. In the Isodec experiment, the two systems Kr-78+Ca-40 (neutron poor) and Kr-86+Ca-48 (neutron rich) at 10A MeV were studied, looking at the competition between the various disintegration decay paths of medium mass compound nuclei, formed by fusion processes and at the isospin influence on the decay process. The results show the presence of a relaxed component in the reaction mechanism, the evidence of staggering effects in the Z distributions, as well as different isotopic composition and neutron enrichment for the reaction products in the two systems. In the Reverse experiment, mass asymmetric projectile-target combinations Sn-124+Ni-64 and Sn-112+Ni-58 were investigated at 35A MeV. We provide evidence that the Dynamical Fission process is about two times more probable than the equilibrated (statistical) Fission one in the neutron rich Sn-124+Ni-64 system with respect to the Sn-112+Ni-58 neutron poor one. The observed difference in the strength of the dynamical effects could arise from the difference in the entrance channel Isospin (N/Z) content.