Abstract
A gold beam (11.6 A·GeV/c) was delivered to experiments at Brookhaven's Tandem-AGS-Booster facility in April 1992, providing the unique opportunity to achieve in a nuclear reaction high baryon densities. It now possible to study ultra-relativistic heavy ion collisions over a wide range of projectile and target masses. The data presented here are from the experiments E-866 and E-802. The first E-866 measurements [1] using the Au beam were made with existing E-802 spectrometer [2]. For E-866, an upgraded forward calorimeter has provided a hardware centrality trigger corresponding to E ZCAL ⩽ 400 GeV, with the beam kinetic energy being E BEAM = 2108 GeV. Software cuts on e zcal were used to define roughly the upper 4% of the total cross section and referred to as central Au+Au collisions. Beside the statistical errors presented here, a systematic error of (10–15)% has to be applied for each result.
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