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Differential Neutron-Proton Squeeze-out

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arxiv 0904.3495 v1 pith:4VOI7AT4 submitted 2009-04-22 nucl-ex

Differential Neutron-Proton Squeeze-out

classification nucl-ex
keywords termgammasqueeze-outsymmetrycollisionscomplexdatadensities
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The elliptic flow (squeeze-out) of neutrons, protons and 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. Preliminary results from a study of the existing FOPI/LAND data for 197Au + 197Au collisions at 400 A MeV 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 = 0.6+-0.3.

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