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

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

1999-03-17

arxiv.org/abs/nucl-ex/9903010v1

Phys.Rev.Lett.83:1295-1298,1999

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 3 figures, Submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.83.1295

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 $ \rho \sim 4 \rho_0$.

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