SYSTEMATIC BEHAVIOR OF K PI RATIO IN RELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS/

A simple hadronic transport model is proposed for studying the rescatt ering effect of the pion on the K/pi ratio in relativistic nucleus-nuc leus collisions. The experimental evidences of evolutionary increase o f the K/pi ratio from p + p to p + Au and to Si + Au at similar incide nt energy per nucleon are reproduced reasonably. Experimental results of the K/pi ratio at CERN energy (200 GeV/nucleon p + W and S + W) com parable with corresponding results at the Brookhaven Alternating Gradi ent Synchrotron energy (14.6 GeV/nucleon p + Au and Si + Au) are repro duced as well.