Multiple muons in the Utah detector. I. Measurement

Final and more extensive data on multiple-muon events deep underground in the Utah muon detector are presented as rates for multiplicities 1 to 5 in a fiducial plane of 80 ${\mathrm{m}}^2$. New results are presented for showers having muon multiplicities from 10 to 50 in a fiducial plane of 100 ${\mathrm{m}}^2$. The measurements are taken at depths ranging from a minimum of 1.5×${10}^5$ g ${\mathrm{cm}}^{-2\mathrm{}}$ to a maximum of 1.0×${10}^6$ g ${\mathrm{cm}}^{-2\mathrm{}}$. The energy per nucleon of the primaries which create the muon shower ranges from ${10}^{13}$ to ${10}^{16}$ eV.