  We discuss a many-particle quantum system, which is obtained by adding some
nonhermitian but PT (i.e. combined parity and time reversal) invariant
interaction to the $A_{N-1}$ rational Calogero model without confining
potential. This model gives rise to scattering states with continuous real
spectrum. The scattering phase shift is determined through the exchange
statistics parameter. We find that, unlike the case of usual Calogero model,
the exclusion and exchange statistics parameter differ from each other in the
presence of PT invariant interaction.
