Probing high-density behavior of symmetry energy from pion emission in heavy-ion collisions

Details Probing high-density behavior of symmetry energy from pion emission in heavy-ion collisions Probing high-density behavior of symmetry energy from pion emission in heavy-ion collisions

2009-04-20

arxiv.org/abs/0904.2990v3

Phys.Lett.B683:140-144,2010

Physics

Nuclear Physics

Nuclear Theory

12 pages, 5 figures

Scientific paper

10.1016/j.physletb.2009.12.006

Within the framework of the improved isospin dependent quantum molecular dynamics (ImIQMD) model, the emission of pion in heavy-ion collisions in the region 1 A GeV as a probe of nuclear symmetry energy at supra-saturation densities is investigated systematically, in which the pion is considered to be mainly produced by the decay of resonances $\triangle$(1232) and N*(1440). The total pion multiplicities and the $\pi^{-}/\pi^{+}$ yields are calculated for selected Skyrme parameters SkP, SLy6, Ska and SIII, and also for the cases of different stiffness of symmetry energy with the parameter SLy6. Preliminary results compared with the measured data by the FOPI collaboration favor a hard symmetry energy of the potential term proportional to $(\rho/\rho_{0})^{\gamma_{s}}$ with $\gamma_{s}=2$.

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