Stopping and Isospin Equilibration in Heavy Ion Collisions

Abstract

We investigate the density behaviour of the symmetry energy with respect to isospin equilibration in the combined systems $Ru(Zr)+Zr(Ru)$ at relativistic energies of 0.4 and $1.528AGeV$. The study is performed within a relativistic framework and the contribution of the iso-vector, scalar $\delta$ field to the symmetry energy and the isospin dynamics is particularly explored. We find that the isospin mixing depends on the symmetry energy and a stiff behaviour leads to more transparency. The results are also nicely sensitive to the "fine structure" of the symmetry energy, i.e. to the covariant properties of the isovector meson fields. The isospin tracing appears much less dependent on the in-medium neutron-proton cross-sections (${\sigma }_{np}$) and this makes such observable very peculiar for the study of the isovector part of the nuclear equation of state. Within such a framework, comparisons with experiments support the introduction of the $\delta$ meson in the description of the iso-vector equation of state.

11 pages, 5 figures. Accepted for publication in Phys.Lett.B

References in corpus (5)

• On the Lorentz structure of the symmetry energy
• Relativistic effects in the search for high density symmetry energy
• Observable effects of symmetry energy in heavy-ion collisions at RIA energies
• Isospin-Dependence of ${\pi }^{-}/{\pi }^{+}$ Ratio and Density-Dependence of Nuclear Symmetry Energy
• Isospin effects in intermediate energy heavy ion collisions

Cited by in corpus (21)

• Recent Progress and New Challenges in Isospin Physics with Heavy-Ion Reactions
• Reaction Dynamics with Exotic Beams
• The Relativistic Dirac-Brueckner Approach to Asymmetric Nuclear Matter
• Isospin effects on sub-threshold kaon production at intermediate energies
• Testing Deconfinement at High Isospin Density
• Aspects of particle production in isospin asymmetric matter
• Unified Description of Nuclear Stopping in Central Heavy-ion Collision from 10$A$ MeV to 1.2$A$ GeV
• Neutron stars with isovector scalar correlations
• Symmetry Energy Effects on the Mixed Hadron-Quark Phase at High Baryon Density
• Isospin dependence of relative yields of $K^{+}$ and $K^0$ mesons at 1.528 AGeV
• Probing the symmetry energy and the degree of isospin equilibrium
• Shear viscosity from nuclear stopping
• Effect of Three-body Interaction on Phase Transition of Hot Asymmetric Nuclear Matter
• Isovector Channel Role of Relativistic Mean Field Models in the Neutrino Mean Free Path
• Influence of charge asymmetry and isospin dependent cross-section on nuclear stopping
• On the nuclear stopping in asymmetric colliding nuclei
• Relativistic Mean-Field Theory Equation of State of Neutron Star Matter and a Maxwellian Phase Transition to Strange Quark Matter
• Observing the Ping-pong Modality of Isospin Degree of Freedom in Cluster Emission from Heavy Ion Reactions
• Revisit to the yield ratio of triton and ${}^3$He as an indicator of neutron-rich neck emission
• Isospin effects in a covariant transport approach to spallation reactions: Analysis of $p+Fe$ and $Pb$ reactions at 0.8, 1.2 and 1.6 GeV
• Probing Dense Partonic Matter at RHIC