Symmetry energy from elliptic flow in 197Au + 197Au

A. Pagano; J. Lukasik; M. Chartier; M. Zoric; P. Pawlowski; P. Russotto; P.Z. Wu; Q. Li; R.C. Lemmon; W. Trautmann

Symmetry energy from elliptic flow in 197Au + 197Au

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arxiv 1101.2361 v1 pith:72G3FZ6F submitted 2011-01-12 nucl-ex

Symmetry energy from elliptic flow in 197Au + 197Au

P. Russotto , P.Z. Wu , M. Zoric , M. Chartier , Y. Leifels , R.C. Lemmon , Q. Li , J. Lukasik

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A. Pagano P. Pawlowski W. Trautmann

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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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