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

Journal Article · · Physical Review Letters
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  1. Departments of Chemistry and Physics, State University of New York, Stony Brook, New York 11794 (United States)
  2. Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  3. Ohio State University, Columbus, Ohio 43210 (United States)
  4. Kent State University, Kent, Ohio 44242 (United States)
  5. University of California, Davis, California 95616 (United States)
  6. Michigan State University, East Lansing, Michigan 48824-1321 (United States)
  7. Purdue University, West Lafayette, Indiana 47907-1396 (United States)
  8. Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States)
  9. Brookhaven National Laboratory, Upton, New York 11973 (United States)
  10. SUBATECH, Ecole des Mines, F-44070 Nantes (France)
  11. University of Auckland, Auckland (New Zealand)
  12. Columbia University, New York, New York 10027 (United States)
  13. St. Mary`s College, Moraga, California 94575 (United States)
  14. Harbin Institute of Technology, Harbin, 150001 People`s Republic of (China)
+ Show Author Affiliations
We have measured the proton elliptic flow excitation function for the Au+Au system spanning the beam energy range (2{endash}8)A GeV . The excitation function shows a transition from negative to positive elliptic flow at a beam energy, E{sub tr}{approximately}4A GeV . 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{approximately}380 MeV ) at low beam energies (E{sub beam}{le}2A GeV ) to a softer form (K{approximately}210 MeV ) at higher energies (E{sub beam}{ge}4A GeV ) where the calculated baryon density {rho}{approximately}4{rho}{sub 0} . {copyright} {ital 1999} {ital The American Physical Society}
OSTI ID:
362715
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 7 Vol. 83; ISSN 0031-9007; ISSN PRLTAO
Country of Publication:
United States
Language:
English

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Related Subjects

66 PHYSICS
BOLTZMANN EQUATION
EQUATIONS OF STATE
EXCITATION FUNCTIONS
GOLD
HEAVY ION REACTIONS
NUCLEAR MATTER