Asymmetric Colliding Nuclear Matter Approach in Heavy Ion Collisions

Abstract

The early stage of a heavy ion collision is governed by local non-equilibrium momentum distributions which have been approximated by colliding nuclear matter configurations, i.e. by two Lorentz elongated Fermi ellipsoids. This approach has been extended from the previous assumption of symmetric systems to asymmetric 2-Fermi sphere configurations, i.e. to different densities. This provides a smoother transition from the limiting situation of two interpenetrating currents to an equilibrated system. The model is applied to the dynamical situations of heavy ion collisions at intermediate energies within the framework of relativistic transport (RBUU) calculations. We find that the extended colliding nuclear matter approach is more appropriate to describe collective reaction dynamics in terms of flow observables, in particular, for the elliptic flow at low energies.

21 pages, 8 figures, accepted for publication in Nuclear Physics A

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Cited by in corpus (6)

• Excitation function of elliptic flow in Au+Au collisions and the nuclear matter equation of state
• Modelization of the EOS
• Aspects of particle production in isospin asymmetric matter
• In-medium effects on particle production 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