[en] The study of the angular distributions of particles and fragments permits the characterization of nucleus-nucleus interaction to get information on the properties of nuclear matter. We have studied the distributions in the reaction plane and off-plane of the particles and fragments and derived from the widths of these distributions, the value of the angular momenta of nuclei in the moment of emission of these particles and fragments. For instance, in the system Pb + Au at 29 MeV/u spin values of 30 to 90 ℎ were determined. For the same system in the most violent collisions leading to the same exit channel, i.e. for the binary processes followed by the fission of one of the two partners we have also studied the angular distributions of fragments relative to the recoil direction. Due to the Coulomb effects between different fragments we were able to measure the lifetime of the nucleus prior to the fragmentation and found very low values, of the order of 250 fm/c (<10^-21 s). Than the problem is to know whether these scissions in two fragments correspond to a statistical process or to a fast scission initiated after the interaction of the projectile and target. In this report it was studied only the de-excitation of quasi-projectile. The study of the fragments and correlated light particles has evidenced off-equilibrium emissions. In conclusion, the reaction dynamics acquires a capital significance not only in the phase of 'hot nuclei' formation but also in their decay modes. Consequently, the exclusive statistical considerations made so far (i.e. analysis in terms of temperature or spin etc.) have to be reconsidered