Abstract
The momentum spectrum and the variation of the positive-negative ratio with energy of single cosmic-ray muons arriving at sea-level in the near vertical direction has been measured at Nottingham using a solid iron magnet spectrometer. The data on the spectrum includes the earlier work of Baber, Nash and Rastin and extends over the momentum range 3 GeV/ c < p < 1000 GeV/ c. The high-momentum portion of the spectrum is based on some 5000 particles of momentum greater than 22 GeV/ c. Comparison of the present spectrum with the results of other workers shows agreement between the basic data although some uncertainty has been found to be associated with the different normalisation procedures adopted. The results of the variation of the positive-negative ratio with energy show that the previously reported increase with increasing energy was probably due to the lack of adequate statistical accuracy. The positive-negative ratio as determined from this experiment appears to be consistent with a constant value of 1.25 over the entire energy range.
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