A phenomenological model for the nucleon structure functions is presented.
Visualising the nucleon as a cavity filled with parton gas in equilibrium and
parametrizing the effects due to the finiteness of the nucleon volume, we
obtain a good fit to the data on the structure function F2p. The model then
successfully predicts other unpolarized structure function data.Comment: 11 pages, Latex, 3 ps figures. typographical errors in the values of
a and b on page 6, and in the footnote were corrected. No other change