  Using \chiQM with configuration mixing, the contribution of the gluon
polarization to the flavor singlet component of the total spin has been
calculated phenomenologically through the relation
\Delta\Sigma(Q^2)=\Delta\Sigma-\frac{3\alpha_s(Q^2)}{2\pi}\Delta g(Q^2) as
defined in the Adler-Bardeen scheme, where \Delta\Sigma on the right hand side
is Q^2 independent. For evaluation the contribution of gluon polarization
\Delta g'(=\frac{3\alpha_s(Q^2)}{2\pi}\Delta g(Q^2)), \Delta\Sigma is found in
the \chiQM by fixing the latest E866 data pertaining to \bar u-\bar d asymmetry
and the spin polarization functions whereas \Delta \Sigma(Q^2) is taken to be
0.30\pm0.06 and \alpha_s= 0.287\pm0.020, both at Q^2=5{\rm GeV}^2. The
contribution of gluon polarization \Delta g' comes out to be 0.33 which leads
to an almost perfect fit for spin distribution functions in the \chiQM. When
its implications for magnetic moments are investigated, we find perfect fit for
many of the magnetic moments. If an attempt is made to explain the angular
momentum sum rule for proton by using the above value of \Delta g', one finds
the contribution of gluon angular momentum to be as important as that of the q
\bar q pairs.
