Abstract
The deep inelastic scattering experiments reveal that the nucleon is a composite object consisting of quarks and gluons. Treating them as Fermi and Bose gases, statistical distribution functions are used to describe their momentum distributions in the rest frame. When transformed to the infinite momentum frame, they yield quark and gluon distribution functions. A thermodynamical bag model is proposed to obtain realistic distribution functions that yield correctly the nucleon structure functions. By including the spin degree of freedom in the Fermi statistical distribution functions, the quark spin distribution functions and the polarized nucleon structure functions are obtained.
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