Universal fluctuations in heavy-ion collisions in the Fermi energy domain.
We discuss the scaling laws of both the charged fragments multiplicity n fluctuations and the charge of the largest fragment Z(max) fluctuations for Xe + Sn collisions in the range of bombarding energies between 25A MeV and 50A MeV. We show at E(lab) > or similar to 32 MeV/A the transition in the fluctuation regime of Z(max) which is compatible with the transition 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.
Botet
R
R
Laboratoire de Physique des Solides--CNRS, Bâtiment 510, Université Paris-Sud, Centre d'Orsay, F-91405 Orsay, France.
Ploszajczak
M
M
Chbihi
A
A
Borderie
B
B
Durand
D
D
Frankland
J
J