Symmetry energy from elliptic flow in 197Au + 197Au

Details Symmetry energy from elliptic flow in 197Au + 197Au Symmetry energy from elliptic flow in 197Au + 197Au

2011-01-12

arxiv.org/abs/1101.2361v1

Phys.Lett.B697:471-476,2011

Physics

Nuclear Physics

Nuclear Experiment

13 pages, 5 figures, submitted to Phys. Lett. B

Scientific paper

10.1016/j.physletb.2011.02.033

The elliptic-flow ratio of neutrons with respect to protons or light complex particles in reactions of neutron-rich systems at relativistic energies is proposed as an observable sensitive to the strength of the symmetry term in the equation of state at supra-normal densities. The results obtained from the existing FOPI/LAND data for 197Au + 197Au collisions at 400 MeV/nucleon in comparison with the UrQMD model favor a moderately soft symmetry term with a density dependence of the potential term proportional to rho/rho_0^gamma with gamma = 0.9 +- 0.4.

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