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The ALEPH detector at LEP has been used to measure the momentum spectrum andcharge ratio of vertical cosmic ray muons underground. The sea-level cosmic raymuon spectrum for momenta up to 2.5 TeV/c has been obtained by correcting forthe overburden of 320 meter water equivalent (mwe). The results are comparedwith Monte Carlo models for air shower development in the atmosphere. From theanalysis of the spectrum the total flux and the spectral index of the cosmicray primaries is inferred. The charge ratio suggests a dominantly lightcomposition of cosmic ray primaries with energies up to 10^15 eV.

Spectrum and Charge Ratio of Vertical Cosmic Ray Muons up to Momenta of 2.5 TeV/c