Abstract

In the broad band neutral beam at Fermi National Accelerator Laboratory, the dimuon production by high energy neutrons has been measured for incident neutron energies of approximately 250 and 320 GeV. The mass spectra show clear peaks in the rho-omega mass region and at the J /psi mass. Cross sections and longitudinal and transverse momenta distributions are given for the J /psi. The data between 1. 0 and 3. 0 GeV /$c^2$ are compared with the mass distribution predicted by the Drell-Yan model.

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