Isospin Dynamics in Heavy Ion Collisions: EoS-sensitive Observables

Abstract

Heavy Ion Collisions (HIC) represent a unique tool to probe the in-medium nuclear interaction in regions away from saturation and at high nucleon momenta. In this report we present a selection of reaction observables particularly sensitive to the isovector part of the interaction, i.e. to the symmetry term of the nuclear Equation of State (EoS) At low energies the behavior of the symmetry energy around saturation influences dissipation and fragment production mechanisms. Predictions are shown for deep-inelastic and fragmentation collisions induced by neutron rich projectiles. Differential flow measurements will also shed lights on the controversial neutron/proton effective mass splitting in asymmetric matter. The high density symmetry term can be derived from isospin effects on heavy ion reactions at relativistic energies (few AGeV range), that can even allow a ``direct'' study of the covariant structure of the isovector interaction in the hadron medium. Rather sensitive observables are proposed from collective flows and from pion/kaon production. The possibility of the transition to a mixed hadron-quark phase, at high baryon and isospin density, is finally suggested. Some signatures could come from an expected ``neutron trapping'' effect.

10 pages, 5 figures; espcrc1 style; IX Int.Conf. on Nucleus-Nucleus Collisions, Rio de Janeiro Aug.2006; to appear in Nucl.Phys.A

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Cited by in corpus (9)

• Symmetry Energy Effects on Fusion Cross Sections
• On the elliptical flow and asymmetry of the colliding nuclei
• Influence of charge asymmetry and isospin dependent cross-section on nuclear stopping
• Model dependence of isospin sensitive observables at high densities
• On the nuclear stopping in asymmetric colliding nuclei
• Probing the momentum dependence of medium modifications of the nucleon-nucleon elastic cross sections
• Pion production and absorption in heavy-ion collisions
• Introduction - Strong interaction in the nuclear medium: new trends
• Probing the symmetry energy at high baryon density with heavy ion collisions