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We present the results of an analysis of charged particle pseudorapidity distributions in the central region in collisions of a Au projectile with Al, Cu, Au, and U targets at an incident momentum of 10.8 GeV/c per nucleon. The pseudorapidity distributions are presented as a function of transverse energy produced in the target or central pseudorapidity regions. The correlation between charged multiplicity and transverse energy measured in the central region, as well as the target and projectile regions, is also presented. We give results for transverse energy per charged particle as a function of pseudorapidity and centrality.PACS number(s): 25.75.+r, 13.85.t

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Inclusive double ddferential multiplicities d N/dy dp& and related quantities have been measured for protons and deuterons produced in 14.6A GeV/c Si + Al and Si + Pb collisions using the E814 forward spectrometer at the AGS at BNL. Collision "centrality" is determined by measuring N" the total charged particle multiplicity in the pseudorapidity range 0.85 ( g (3. 8. For both systems Si + Al and Si + Pb, an increase in the proton rapidity distribution dN/dy at midrapidity and a corresponding decrease at higher rapidities are observed with increasing N, . For Si + Pb, Boltzmann slope parameters T~increase significantly in the most central collisions. The measured distributions exhibit a centrality dependence even when o/o's, & 10%%uo, where full overlap between the Si and Pb nuclei occurs in a simple geometric picture. The proton rapidity distribution dN/dy is presented for the symmetric system Si + Al over the entire rapidity interval. The total number of protons, which is the integral of this quantity over rapidity, varies with N, . Results are compared with various model calculations, mostly using the hadronic cascade codes ARC and RQMD. No significant nuclear transparency is observed, indicating that large baryon and energy densities are produced in these collisions.PACS number(s): 25.75.+r