  We study a Centauro-type phenomenon in high-energy heavy-ion collisions by
assuming that pions are produced semiclassically both directly and in pairs
through the isovector channel. The leading-particle effect and the
factorization property of the scattering amplitude in the impact-parameter
space are used to define the classical pion field. By analyzing the joint
probability function $P_{II_{3}}(n_{0},n_{\_})$ for producing $n_{0}$ neutral
and $n_{-}$ negative pions from a definite isospin state $II_{3}$ of the
incoming leading-particle system we show that only direct production of pions
without isovector pairs favors Centauro-type behavior. The presence of
isovector pairs seems to destroy the effect. Our conclusion is supported
through the calculation of two pion correlation parameters, $f_{2}^{0-}$ and
$f_{2}^{00}$, and the average number of neutral pions $(< n_{0} >_{n_{\_}})$ as
a function of negative pions $(n_{\_})$ produced.
