Circumstantial Evidence for a Stiff Nuclear Equation of State

We discuss the recent attempts to extract the nuclear equation of state from event-by-event data on high energy heavy ion collisions via the Vlasov-Uehling-Uhlenbeck theory. In this approach, the time evolution of the Wigner function is followed in configuration and momentum space. Rapid stopping of the projectile occurs at small impact parameters. For intermediate impact parameters, the theory predicts simultaneously the bounce-off effect of the projectile fragments and the sidewards flow of the participant matter. The latter can be displayed via a peak in the distribution of the flow angle Op at large values of Op, while the bounce-off is most easily observed via a pronounced maximum of the transverse momentum transfer p x (y) at the projectile rapidity. A drastic dependence of p x and Op on the mass of the colliding system, impact parameter, and bombarding energy is predicted. Recent data are used to extract an equation of state. The resulting EOS is consistently the same and in quantitative agreement with results obtained from pion multiplicities via various methods.

TALK
SCATTERING: HEAVY ION
HEAVY ION: SCATTERING
NUCLEUS NUCLEUS: NUCLEAR REACTION
MULTIPLE PRODUCTION: FRAGMENTATION
FRAGMENTATION: MULTIPLE PRODUCTION
ANGULAR DISTRIBUTION
TRANSVERSE MOMENTUM: RAPIDITY
PI: MULTIPLICITY
NUCLEAR MATTER

References(36)

Figures(0)

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