Abstract
Deep inelastic polarized and unpolarized structure functions for a free nucleon are obtained in a modified center-of-mass bag model, which includes the symmetry-breaking effects from spin-dependent interactions. The quark distribution functions, calculated at ${Q}_{0}^{2}\ensuremath{\simeq}{(0.9 \frac{\mathrm{GeV}}{c})}^{2}$, are evolved to a higher ${Q}^{2}$ region and compared with the data and other models. The model gives a reasonable description for the valence part of the structure functions at $x>0.3$. For the small-$x$ region, the contributions from the sea are necessary. The spin-dependent effects are important in describing the existing data.
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