No abstract

Energy of light charged-particles has been measured in coincidence with one or two fission fragments in the reaction Z°Ne+ 197Au at a bombarding energy of 13 MeV/u. The fission cross section was found equal to 1,340 + 260 rob. Assuming that it represents the totality of the fusion cross section, the critical value l c is deduced equal to 93 _+ 9 h, higher than /By=o--74 in the rotating liquid drop model. The main emission source for protons and alpha particles seems to be a thermally equilibrated composite system. The competition between fission and charged particle emission is unexpected in the frame of the statistical treatment. A high energy component is observed in the forward direction. These results correspond to the first step of a study programme on the evolution of nucleus-nucleus collisions between 10 and 100 MeV per nucleon.