S. Y. Chu

Collective flow and the stiffness of compressed nuclear matter

Sideward flow parameters for Ar+KCl at 1.2 and 1.8 A GeV are compared with VUU model predictions for different nuclear equations of state. This model indicates that compressional effects are needed to account for the observed flow. Various uncertainties hinder a precise determination of the compressibility; our current best estimate lies somewhere between the so‐called ‘‘medium’’ and ‘‘stiff ’’ equations of state.

Multi‐particle correlations and the nuclear equation of state

Using 4π data from the Bevalac streamer chamber, we compare the information contained in azimuthal correlations for fragment pairs (as in conventional flow analyses) and higher‐order (N≥3) multiplets. Our findings serve to quantify the ‘‘collectivity’’ of the azimuthal correlations. The magnitude of the flow correlation increases strongly with N, demonstrating that the phenomenon is indeed a collective effect.

Two‐ and three‐pion correlations in Ar on Pb3O4 collisions

The technique of pion interferometry is used to study the pion source for central collisions of 1.8 GeV/nucleon Ar on Pb3O4. Both two and three pion correlations are presented.