Fragment charge correlations and spinodal decomposition in finite nuclear systems

Fragment Charge Correlations and Spinodal Decomposition in Finite Nuclear Systems

Enhanced production of events with almost equal-sized fragments is experimentally revealed by charge correlations in the multifragmentation of a finite nuclear system selected in Xe central collisions on Sn. The evolution of their weight with the incident energy: 32, 39, 45, 50 AMeV, is measured. Dynamical stochastic mean field simulations performed at 32 AMeV, in which spinodal instabilities a...

Dynamics of fragment formation in the nuclear spinodal region.

The Vlasov-Nordheim equation is solved numerically on a lattice for nuclear matter in two dimensions. We discuss the reliability of the model at normal density and then study the response of the system to small perturbations. We find deterministic chaos inside the spinodal zone where fragment formation occurs. We discuss in detail the dynamical features of this phenomenon in order to clarify th...

Spinodal decomposition of expanding nuclear matter and multifragmentation

Density fluctuations of expanding nuclear matter are studied within a mean–field model in which fluctuations are generated by an external stochastic field. The time evolution of the system is studied in a kinetic–theory approach. In this model fluctuations develop about a mean one–body phase–space density corresponding to a hydrodynamic motion that describes a slow expansion of the system. A fl...

Spinodal decomposition in microemulsions

Mechanical and chemical spinodal instabilities in finite quantum systems.

Self-consistent quantum approaches are used to study the instabilities of finite nuclear systems. The frequencies of multipole density fluctuations are determined as a function of dilution and temperature for several isotopes. The spinodal region of the phase diagrams is determined, and it appears that instabilities are reduced by finite size effects. The role of surface and volume instabilitie...