Symmetry energy from elliptic flow in 197Au +197Au
Physics Letters B2011Vol. 697(5), pp. 471–476
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P. Russotto, P. Wu, Marko Zorić, M. Chartier, Y. Leifels, R. C. Lemmon, Qingfeng Li, J. Łukasik, A. Pagano, P. Pawłowski, W. Trautmann
Abstract
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 (ρ/ρ0)γ with γ=0.9±0.4.
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