Dimuon Production on Nuclear Targets

We have measured the production of ρ+ω and J vector mesons, through their dimuon decay modes, by high-energy neutrons on nuclear targets at Fermilab. We determined the A dependence to be A^0.62±0.03 for ρ+ω, A^0.93±0.04 for J, and A^0.85±0.05 for the continuum of dimuons between the ρ+ω and J masses.