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The momentum correlation between protons and lambda particles emitted fromcentral Pb+Pb collisions at sqrt(s_{NN}) = 17.3 GeV was studied by the NA49experiment at the CERN SPS. A clear enhancement is observed for small relativemomenta (q_{inv} < 0.2 GeV). By fitting a theoretical model, which uses thestrong interaction between the proton and the lambda in a given pair, to themeasured data a value for the effective source size is deduced. Assuming astatic Gaussian source distribution we derive an effective radius parameter ofR_G = 3.02 \pm 0.20$(stat.)^{+0.44}_{-0.16}(syst.) fm.

Proton -- Lambda Correlations in Central Pb+Pb Collisions at sqrt(s_{NN}) = 17.3 GeV