Hard photons and energetic protons as probes of the nuclear dynamics at intermediate energy

The emission of hard photons and pre-equilibrium protons has been investiga ted in exclusive experiments performed with MEDEA detector The observation of the gamma-proton anticorrelation indicates that the dominant production mechanism is the first-chance neutron-proton (np) collisions. The anisotrop ic angular distributions point out the presence of screening effects and ar e reminiscent of the free np scattering thus giving information of the spac e-time origin of the energetic protons. Protons, with energy more than twic e the kinematical limit for nucleon-nucleon (NN) collisions, have been obse rved in several reactions around the Fermi energy.