A balloon measurement of the cosmic ray element abundances

Physics

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Abundance, Balloon-Borne Instruments, Cosmic Rays, Heavy Nuclei, Radiation Counters, Cerenkov Counters, Histograms, Iron, Nitrogen, Oxygen, Particle Energy, Pulse Amplitude, Scintillation Counters, Upper Atmosphere

Scientific paper

The experiment described was flown from Thompson, Canada in August, 1973 to measure the cosmic ray element abundances in the atmosphere. All particles used in the analysis, including approximately 25,000 oxygen and 1600 iron nuclei, had sufficient energy at the top of the atmosphere to trigger the Cerenkov counter. Nuclei between beryllium and nickel were identified, using two plastic scintillators and an acrylic plastic Cerenkov counter. The relative composition and fluxes are determined. Agreement with earlier measurements in the atmosphere is within 5%; however, larger differences appear in composition extrapolated to the top of the atmosphere. In particular, the nitrogen abundance is almost 20% higher and the iron abundance is 20% lower than the generally accepted values.

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