  Using the expansion of the baryon wave function in a series of products of
single quark bispinors (Dirac orbitals), the nonsinglet axial and tensor
charges of a nucleon are calculated. The leading term yields $g_A = 1.27$ in
good agreement with experiment. Calculation is essentially parameter-free and
depends only on the strong coupling constant value $\alpha_s$. The importance
of lower Dirac bispinor component, yielding 18% to the wave function
normalization is stressed. As a check, the baryon decuplet masses in the
formalism of this model are also computed using standard values of the string
tension $\sigma$ and the strange quark mass $m_s$; the results being in a good
agreement with experiment.
