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Elliptic Flow: Transition from Out-of-Plane to In-Plane Emission in Au + Au Collisions

1999; American Physical Society; Volume: 83; Issue: 7 Linguagem: Inglês

10.1103/physrevlett.83.1295

1092-0145

C. Pinkenburg, N. N. Ajitanand, J. M. Alexander, M. Anderson, David Best, F.P. Brady, T. Case, W. Caskey, D. Cebra, J. L. Chance, P. Chung, B. Cole, K.M. Crowe, Arpita Das, J. E. Draper, A. Elmaani, M. L. Gilkes, S. Gushue, M. Heffner, A. Hirsch, E. Hjort, L. Huo, M. Justice, M. Kaplan, D. Keane, J. C. Kintner, J. Klay, D. Krofcheck, R. Lacey, J. Lauret, Choi Look Law, M. A. Lisa, H. Liu, Y. M. Liu, Robert L. McGrath, Z. Milosevich, G. Odyniec, D. Olson, S. Panitkin, N. Porile, G. Rai, H. G. Ritter, J. L. Romero, R. P. Scharenberg, L. S. Schroeder, B. Srivastava, N. T. B. Stone, T. J. M. Symons, J. Whitfield, T. Wienold, R. Witt, L. Wood, W. N. Zhang, P. Danielewicz, Pol-Bernard Gossiaux,

Fusion materials and technologies

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, Etr∼4AGeV. Detailed comparisons with calculations from a relativistic Boltzmann equation are presented. The comparisons suggest a softening of the nuclear equation of state from a stiff form ( K∼380MeV) at low beam energies ( Ebeam≤2AGeV) to a softer form ( K∼210MeV) at higher energies ( Ebeam≥4AGeV) where the calculated baryon density ρ∼4ρ0.Received 21 September 1998DOI:https://doi.org/10.1103/PhysRevLett.83.1295©1999 American Physical Society