In-medium effects on particle production in heavy ion collisions

Abstract

The effect of possible in-medium modifications of nucleon-nucleon ($NN$) cross sections on particle production is investigated in heavy ion collisions ($HIC$) at intermediate energies. In particular, using a fully covariant relativistic transport approach, we see that the density dependence of the {\it inelastic} cross sections appreciably affects the pion and kaon yields and their rapidity distributions. However, the $({\pi }^{-}/{\pi }^{+})$- and $(K^0/K^{+})$-ratios depend only moderately on the in-medium behavior of the inelastic cross sections. This is particularly true for kaon yield ratios, since kaons are more uniformly produced in high density regions. Kaon potentials are also suitably evaluated in two schemes, a chiral perturbative approach and an effective meson-quark coupling method, with consistent results showing a similar repulsive contribution for $K^{+}$ and $K^0$. As a consequence we expect rather reduced effects on the yield ratios. We conclude that particle ratios appear to be robust observables for probing the nuclear equation of state ($EoS$) at high baryon density and, particularly, its isovector sector.

29 pages, 15 figures, accepted for publication in Nuclear Physics A

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• Neutron-proton bremsstrahlung from intermediate energy heavy-ion reactions as a probe of the nuclear symmetry energy?
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• Influence of scalar-isovector delta-meson field on quark phase structure in neutron stars
• A direct probe of the in-medium pn scattering cross section
• Isospin Effects on Strangeness in Heavy-Ion Collisions
• Effects of symmetry energy in ${}^{132}\mathrm{Sn}{+}^{124}\mathrm{Sn}$ reaction at 300 MeV/nucleon
• The density- and isospin- dependent $\Delta$-formation cross section and its decay width
• Probing the momentum dependence of medium modifications of the nucleon-nucleon elastic cross sections
• Nuclear symmetry energy and proton-rich reactions at intermediate energies
• Constraining the Symmetry Energy: A Journey in the Isospin Physics from Coulomb Barrier to Deconfinement
• An explanation of the elliptic flow difference between proton and anti-proton from the UrQMD model with hadron potentials
• Nuclear medium effect on nuclear modification factor of protons and pions in intermediate-energy heavy ion collisions
• Pion production and absorption in heavy-ion collisions
• Blind spots of probing the high-density symmetry energy in heavy-ion collisions
• Probing in-medium nucleon-nucleon inelastic scattering cross section by using energetic n/p ratio
• Probing the symmetry energy at high baryon density with heavy ion collisions
• Quark Deconfinement Phase Transition in Neutron Stars