Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
1999-03-17
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$.
collaboration E895
Pinkenburg Christopher
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