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 m$sup 2$. New results are presented for showers having muon multiplicities from 10 to 50 in a fiducial plane of 100 m$sup 2$. The measurements are taken at depths ranging from a minimum of 1.5times10$sup 5$ g cm$sup -2$ to a maximum of 1.0times10$sup 6$ g cm$sup -2$. The energy per nucleon of the primaries which create the muon shower ranges from 10$sup 13$ to 10$sup 16$ eV.