Heavy ion collisions with non-equilibrium Dirac-Brueckner mean fields

Abstract

The influence of realistic interactions on the reaction dynamics in intermediate energy heavy ion collisions is investigated. The mean field in relativistic transport calculations is derived from microscopic Dirac-Brueckner (DB) self-energies, taking non-equilibrium effects, in particular the anisotropy of the local phase space configurations, into account. Thus this approach goes beyond the local density approximation. A detailed analysis of various in-plane and out-of-plane flow observables is presented for Au on Au reactions at incident energies ranging from 250 to 800 A.MeV and the results are compared to recent measurements of the FOPI collaboration. An overall good agreement with in-plane flow data and a reasonable description of the out-of-plane emission is achieved. For these results the intrinsic momentum dependence of the non-equilibrium mean fields is important. On the other hand, the local density approximation with the same underlying DB forces as well as a standard non-linear version of the $\sigma \omega$ model are less successful in describing the present data. This gives evidence of the applicability of self energies derived from the DB approach to nuclear matter also far from saturation and equilibrium.

63 pages Latex, using Elsevier style, 20 ps-figures, to appear in Nucl. Phys. A

References in corpus (8)

• The multifragmentation of spectator matter
• Nucleon self-energy in the relativistic Brueckner approach
• In-medium dependence and Coulomb effects of the pion production in heavy ion collisions
• Onset of Nuclear Matter Expansion in Au+Au Collisions
• Baryon flow at SIS energies
• Scalar and vector decomposition of the nucleon self-energy in the relativistic Brueckner approach
• Temperature and thermodynamic instabilities in heavy ion collisions
• Azimuthal Anisotropies as Stringent Test for Nuclear Transport Models

Cited by in corpus (16)

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• Transport approaches for the Description of Intermediate-Energy Heavy-Ion Collisions
• Nuclear stopping and flow in heavy ion collisions and the in-medium NN cross section
• Stopping and Isospin Equilibration in Heavy Ion Collisions
• Microscopic study of energy and centrality dependence of transverse collective flow in heavy-ion collisions
• Transverse momentum dependence of directed particle flow at 160 AGeV
• Spectator and participant decay in heavy ion collisions
• Consequences of kinetic non-equilibrium for the nuclear equation-of-state in heavy ion collision
• Asymmetric Colliding Nuclear Matter Approach in Heavy Ion Collisions
• Fragment Formation in Central Heavy Ion Collisions at Relativistic Energies
• Interplay of anisotropies of momentum distribution and mean field in heavy-ion collisions
• Quark-Meson Coupling Model in Heavy-Ion Collision Simulations
• Transport Model Comparison Studies of Intermediate-Energy Heavy-Ion Collisions