S+Au interactions at 200A GeV were observed using emulsion chambers, permitting measurement of pseudorapidities in the central region with precision ∼0.01 unit. Scaled-factorial-moment analyses are extended to bin sizes smaller than those accessible to other fixed-target experimental techniques. For a sample of 151 central collisions, moments are calculated using both ‘‘horizontal’’ and ‘‘vertical’’ analysis techniques. While the moments are found to rise (in a log-log plot) with decreasing pseudorapidity bin size δη, their slopes roll off to approximately zero for δη<0.1.

• Received 29 March 1990

DOI:https://doi.org/10.1103/PhysRevLett.65.412