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Emission of pi, K, phi and Lambda was measured in near-central C+C and Si+Sicollisions at 158 AGeV beam energy. Together with earlier data for p+p, S+S andPb+Pb, the system-size dependence of relative strangeness production innucleus-nucleus collisions is obtained. Its fast rise and the saturationobserved at about 60 participating nucleons can be understood as onset of theformation of coherent partonic subsystems of increasing size.Comment: Phys.Rev.Lett in print; version2: changes made according to the  request of the referee

physical review letters

System-Size Dependence of Strangeness Production in Nucleus-Nucleus Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>17.3</mml:mn><mml:mtext> </mml:mtext><mml:mi mathvariant="normal">G</mml:mi><mml:mi mathvariant="normal">e</mml:mi><mml:mi mathvariant="normal">V</mml:mi></mml:math>

System-Size Dependence of Strangeness Production in Nucleus-Nucleus Collisions atsNN=17.3 GeV