Liens entre les propriétés statistiques et dynamiques des fragments produits lors des collisions d'ions lourds autour de l'énergie de Fermi.

Abstract : The properties of the fragments produced in heavy-ion collisions around the Fermi energy have been studied through the isospin degree of freedom.Firstly a theoretical ap- proach based on a lattice gas model with two types of particles (neutron,proton) interacting by an isospin dependent and Coulomb interactions was developped.The study of the phase diagram shows that this system presents three different phases (liquid,gas,fission). In the liquid and gas phases, the energy of the system was described by a density functional, where the temperature dependence acts only on the density.The symmetry term of this functional was related to the isotopic content of the biggest fragment via an isoscaling ana- lysis.Secondly a systematic study of the stopping power of the nuclear matter and isospin equilibration of light particles in the most violent collisions was carried out using the expe- rimental data taken by the INDRA multidetector at GANIL and GSI. Two stopping power regimes appear ; at low energy (<40MeV/A) the stopping power decreases with increasing beam energy, whereas at high energy the stopping power is governed by the quantity of matter along the beam direction. An other study has been focused on the Xe+Sn reaction at 32 and 45 MeV/A width different isospin systems. The separation of three different reac- tion mechanisms by use of a principal component anlysis allowed us to observe that the isospin content of light particles seems to be independent on the mechanism, but depends on the violence of the collision (i.e. impact parameter).
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Submitted on : Wednesday, October 28, 2009 - 11:39:59 AM
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  • HAL Id : tel-00426878, version 1

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G. Lehaut. Liens entre les propriétés statistiques et dynamiques des fragments produits lors des collisions d'ions lourds autour de l'énergie de Fermi.. Physique Nucléaire Théorique [nucl-th]. Université de Caen, 2009. Français. ⟨tel-00426878⟩

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