The one-particle distribution function in the wee-$x$ region is derived in the diffractive-excitation model. The result describes very well the "isotropy" and "Bose-Einstein" distribution of the 11.8-GeV/c $K^{+}p$ data on inclusive reactions in that region. There is no need for the postulation of "blackbody radiation." It is shown that the phenomenon should disappear at asymptotic energies.

• Received 24 March 1972

DOI:https://doi.org/10.1103/PhysRevD.7.1469