Universal fluctuations in heavy-ion collisions in the Fermi energy domain

We discuss the scaring laws of both the charged fragments multiplicity a fl uctuations and the charge of the largest fragment Z(max) fluctuations for X e + Sn collisions in the range of bombarding energies between 25A MeV and 5 0A MeV. We show at E-lab greater than or similar to 32 MeV/A the transition in the Fluctuation regime of Z(max) which is compatible with the transitio n From the ordered to disordered phase of excited nuclear matter. The size (charge) of the largest fragment is closely related to the order parameter characterizing this process.