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It is shown that data on strange particle production as a function ofcentrality in Au-Au collisions at \sqrt(s)_{NN}= 200 GeV can be explained witha superposition of emission from a hadron gas at full chemical equilibrium(core) and from nucleon-nucleon collisions at the boundary (corona) of theoverlapping region of the two colliding nuclei. This model nicely accounts forthe enhancement of phi meson and strange particle production as a function ofcentrality observed in relativistic heavy ion collisions at that energy. Theenhancement is mainly a geometrical effect, that is the increasing weight ofthe core with respect to corona for higher centrality, while strangenesscanonical suppression in the core seems to play a role only in very peripheralcollisions. This model, if confirmed at lower energy, would settle thelong-standing problem of strangeness under-saturation in relativistic heavy ioncollisions, parametrized by $\gs$. Furthermore, it would give a unique tool tolocate the onset of deconfinement in nuclear collisions both as a function ofenergy and centrality if this is to be associated to the onset of the formationof a fully equilibrated core.

Centrality dependence of strangeness production in heavy-ion collisions as a geometrical effect of core-corona superposition