We have measured the yields of protons and A = 2-4 nuclei in collision
s between 10.8A GeV/c Au beams and targets of Al, Cu, and Au. The data
, which cover a broad rapidity range at low transverse momenta, were m
easured as a function of collision centrality using a focusing beam li
ne spectrometer and a high-rate centrality detector. We investigate th
e dependence of coalescence parameters on event geometry. The data are
compared with the predictions of an RQMD+coalescence model.