F > 0.05 Ba(n + N+ J + ••• ) = 5.1 ± 2.2 nb/nucleon -5­ Since no events are observed for masses greater than 4.1 GeV, we set a 90% co~fidence limit on the cross section in the interval 4 < M < 10 GeV]J]J and 0.4 < XF < 0.6 of: -33 2x 10 cm /nucleus and The results for hadron production of JI S are in reasonable agreement with published measurements at slightly different energies,4 although the data reported here extend down to lower values of XF" In conclusion we wish to give special thanks to the members of the Chicago, Harvard, Illinois, Oxford muon-scattering group whose spectrometer was used in modified form for this work. We also acknowledge the help of the Fermil ab Neutrino Laboratory staff and the techni cal support groups at our instituti ons headed by K. Wright and 1. Nunamaker at Chi cago and by at Princeton. -6­ * Work supported by the National Science Foundation and the Energy Research and Development Agency.,,)' Enrico Fermi Postdoctoral Fellow

Invited paper at this conference on muon-nucleon scattering experi­ ments at

This branching ratio is 0.069 ± 0.009 as given by et at 1572

The parton model leads to a linear A dependence in the nuclear cross section--S. Brodsky, private communication. In addition, more general considerations also lead to a linear A dependence--P Shadowing in Inclusive Reactions on Composite Systems and Large PL Inclusive Reactions in Nuclei, University of Virginia preprint