We present a new measurement of air shower muons made during atmospheric ascent of the High Energy Antimatter Telescope balloon experiment. The muon charge ratio μ+/μ- is presented as a function of atmospheric depth in the momentum interval 0.3-0.9 GeV/c. The differential μ- momentum spectra are presented between 0.3 and ∼50 GeV/c at atmospheric depths between 13 and 960 g/cm2. We compare our measurements with other recent data and with Monte Carlo calculations of the same type as those used in predicting atmospheric neutrino fluxes. We find that our measured μ- fluxes are smaller than the predictions by as much as 70% at shallow atmospheric depths, by ∼20% at the depth of shower maximum, and are in good agreement with the predictions at greater depths. We explore the consequences of this on the question of atmospheric neutrino production.
|Number of pages
|Physical Review D - Particles, Fields, Gravitation and Cosmology
|Published - Aug 1 2000
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics