Dynamical description of heavy-ion collisions at Fermi energies

P Napolitani,M Colonna

doi:10.1051/epjconf/201611707008

Abstract

Descriptions of heavy-ion collisions at Fermi energies require to take into account in-medium dissipation and phase-space fluctuations. The interplay of these correlations with the one-body collective behaviour determines the properties (kinematics and fragment production) and the variety of mechanisms (from fusion to neck formation and multifragmentation) of the exit channel. Starting from fundamental concepts tested on nuclear matter, we build up a microscopic description which addresses finite systems and applies to experimental observables.

Highlights

Heavy-ion collisions at Fermi energies are open systems which require a non–equilibrium dynamical description when the process should be followed from the first instants
This representation is the principle of stochastic TDHF which, in the semiclassical context, is analogous to the Boltzmann-Langevin (BL) equation [2], written in terms of the one-body distribution function f (r, p, t)
Fluctuations can be continuously generated through the collision term: they can be projected on a suited subspace like in the SMF approach [4] or, more efficiently, they can be let develop spontaneously in full phase space from agitating extended portions of the phase space in each single scattering event like in the BLOB approach [5]

Summary

Introduction

Heavy-ion collisions at Fermi energies are open systems which require a non–equilibrium dynamical description when the process should be followed from the first instants. N-N collisions affect flow and stopping [1] while fluctuations produce an ensemble of mean field trajectories which reflect in a variety of exit channels and induce fragment formation.

Results

Conclusion