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Two-proton correlation functions have been measured in Si+Pb collisions at14.6A GeV/c and Au+Au collisions at 11.5A GeV/c by the E814/E877 collaboration.Data are compared with predictions of the transport model RQMD and the sourcesize is inferred from this comparison. Our analysis shows that, for bothreactions, the characteristic size of the system at freeze-out exceeds the sizeof the projectile, suggesting that the fireball created in the collision hasexpanded. For Au+Au reactions, the observed centrality dependence of thetwo-proton correlation function implies that more central collisions lead to alarger source sizes.Comment: RevTex, 12 pages, 5 figure

Two-proton correlations from 14.6AGeV/cSi+Pb and 11.5AGeV/cAu+Au central collisions