  A relativistic transport model is used to study Xi- production in 2-11A GeV
Au+Au collisions. Introducing the strangeness-exchange reactions between
antikaons and hyperons as the sources for Xi-, we find that the cascade yield
in these collisions is in reasonable agreement with the data. Although the Xi-
abundance does not reach chemical equilibrium unless the cross section for
strangeness-exchange reactions is enhanced by six times, it exhibits the
strongest enhancement with increasing centrality of collision and with
increasing beam energy.
