We present a study of the flavour asymmetry of polarized anti-quarks in the
nucleon using the meson cloud model. We include contributions both from the
vector mesons and the interference terms of pseudoscalar and vector mesons.
Employing the bag model, we first give the polarized valence quark distribution
of the Ο meson and the interference distributions. Our calculations show
that the interference effect mildly increases the prediction for \Delta
\dbar(x)-\Delta \ubar(x) at intermediate x region. We also discuss the
contribution of `Pauli blocking' to the asymmetry.Comment: 22 pages, LaTex, 5 PS figures. Version to appear in Eur. Phys. J. C.
An appendix is added for expressions for the helicity dependent fluctuation
functions. An error in the programme for fluctuation function
f_{(\pi\rho)\Delta /N} is corrected, which increases numerical results by
about 10%. Unchanged conclusion