Abstract
Measurements have been made of the cosmic-ray muon spectra at large zenith angles using an optical-spark-chamber magnetic spectrometer with a maximum detectable momentum estimated to be 830 GeV/c. Absolute values of energy spectra up to 200 GeV were obtained at 75°, 80° and 85° zenith angles; differential and integral energy spectra approaching 1000 GeV have been evaluated at a zenith angle of 80°. The results are in reasonable agreement with previous magnetic-spectrometer data, and with expected variations in energy and direction for muons arising chiefly from pion sources. No evidence was found for dominant kaon or « X-process » muon sources in the 1000 GeV region. There is also no evidence for any elongation of pion lifetime which would be expected if special relativity broke down at distances less than 10−16 cm.
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