Probing the density dependence of the symmetry potential in intermediate energy heavy ion collisions

Details Probing the density dependence of the symmetry potential in intermediate energy heavy ion collisions Probing the density dependence of the symmetry potential in intermediate energy heavy ion collisions

2005-07-27

arxiv.org/abs/nucl-th/0507068v1

J.Phys. G31 (2005) 1359-1374

Physics

Nuclear Physics

Nuclear Theory

28 pages in RevTex, 11 figures, 1 table, submitted to Journal of Physics G

Scientific paper

10.1088/0954-3899/31/11/016

Based on the ultrarelativistic quantum molecular dynamics (UrQMD) model, the effects of the density-dependent symmetry potential for baryons and of the Coulomb potential for produced mesons are investigated for neutron-rich heavy ion collisions at intermediate energies. The calculated results of the $\Delta^-/\Delta^{++}$ and $\pi ^{-}/\pi ^{+}$ production ratios show a clear beam-energy dependence on the density-dependent symmetry potential, which is stronger for the $\pi ^{-}/\pi ^{+}$ ratio close to the pion production threshold. The Coulomb potential of the mesons changes the transverse momentum distribution of the $\pi ^{-}/\pi ^{+}$ ratio significantly, though it alters only slightly the $\pi^-$ and $\pi^+$ total yields. The $\pi^-$ yields, especially at midrapidity or at low transverse momenta and the $\pi^-/\pi^+$ ratios at low transverse momenta, are shown to be sensitive probes of the density-dependent symmetry potential in dense nuclear matter. The effect of the density-dependent symmetry potential on the production of both, K$^0$ and K$^+$ mesons, is also investigated.

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