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Elliptic Flow: Transition from out-of-plane to in-plane Emission in Au + Au Collisions

E895 collaboration·C. Pinkenburg
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Abstract

We have measured the proton elliptic flow excitation function for the Au + Au system spanning the beam energy range 2 -- 8 AGeV. The excitation function shows a transition from negative to positive elliptic flow at a beam energy, $E_{tr} \sim$ 4 AGeV. Detailed comparisons with calculations from a relativistic Boltzmann-equation are presented. The comparisons suggest a softening of the nuclear equation of state (EOS) from a stiff form (K \sim 380 MeV) at low beam energies (E_{Beam} \le 2 AGeV) to a softer form (K \sim 210 MeV) at higher energies (E_{Beam} \ge $ 4 AGeV) where the calculated baryon density $ ρ\sim 4 ρ_0$.

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E895 collaboration, C. Pinkenburg. 1999-03-17. Elliptic Flow: Transition from out-of-plane to in-plane Emission in Au + Au Collisions. https://doi.org/10.1103/physrevlett.83.1295

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