Measurement of Cosmic-Ray Muon Spectrum and Charge Ratio at Large Zenith Angles in the Momentum Range 100 GeV/<i>c</i>to 10 TeV/<i>c</i>Using a Magnet Spectrograph

Abstract

The cosmic-ray muon momentum spectrum and charge ratio up to momenta \ensuremath{\simeq} 10 TeV/c have been measured with high accuracy. The power index of the differential spectrum of parent mesons at production gradually increases with momentum and becomes 2.87 \ifmmode\pm\else\textpm\fi{}0.06 in the momentum range 1 to 10 TeV/c. The charge ratio is almost constant at a value of 1.25\ifmmode\pm\else\textpm\fi{}0.05 from 0.1 to 10 TeV/c.