Energy spectra, altitude profiles, and charge ratios of atmospheric muons

S. Coutu, J. J. Beatty, M. A. DuVernois, S. W. Barwick, E. Schneider, A. Bhattacharyya, C. R. Bower, J. A. Musser, A. Labrador, D. Müller, S. P. Swordy, E. Torbet, C. Chaput, S. McKee, G. Tarlé, A. D. Tomasch, S. L. Nutter, G. A. DeNolfo

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


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+- 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.

Original languageEnglish (US)
Article number032001
Pages (from-to)1-9
Number of pages9
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number3
StatePublished - Aug 1 2000

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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