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A comprehensive and detailed analysis of hadronic abundances measured inAu-Au collisions at RHIC at sqrt(s)_NN = 130 and 200 GeV is presented. Therapidity densities measured in the central rapidity region have been fitted tothe statistical hadronization model and the chemical freeze-out parametersdetermined as a function of centrality, using data from experiments BRAHMS,PHENIX and STAR. The chemical freeze-out temperature turns out to beindependent of centrality to a few percent accuracy, whereas the strangenessunder-saturation parameter gamma_S decreases from almost unity in centralcollisions to a significantly lower value in peripheral collisions. Our resultsare in essential agreement with previous analyses, with the exception that fitquality at sqrt(s)_NN = 200 GeV is not as good as previously found. From thecomparison of the two different energies, we conclude that the difference infit quality, as described by chi2 values, is owing to the improved resolutionof measurements which has probably exceeded the intrinsic accuracy of thesimplified theoretical formula used in the fits.

Chemical freeze-out in ultra-relativistic heavy ion collisions at sqrt(s)_NN = 130 and 200 GeV