Evolution of cluster production with fragmentation degree

International audienceWe present in this work, the experimental production of clusters in the 58 Ni+ 58 Ni reactions at incident beam energies (Einc) between 32 and 90 MeV/A collected with the INDRA apparatus. We focus on the evolution of their contribution respect to the final fragmentation degree given by the charge of the biggest fragment (Z1) of each event. Mean multiplicities increase when Z1 decreases, but show a plateau for intermediate Z1 values, before increase again toward complete vaporization. This break is in coincidence with the multifragmentation window and is more clear at 32 MeV/A. The opening of the fragment production has an energy cost making the production of clusters in the same time impossible. Using the mass fraction observable (XA), we look at probabilities of nucleons to be free or bound in clusters and how the different species evolve with fragmentation degree and with the incident energy of the collision. We highlight the specific role of the 4 He clusters in the whole range of fragmentation degree. We show that their evolution shape can be used to signed the multifragmentation window. Looking at the different incident energies, The main effect of increasing the average deposited energy in the system is an increase of final light clusters (2,3 H, 3 He) at the expence of the heavier ones