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Measurements of the cosmic-ray hydrogen and helium spectra at energies from 20 to 800 TeV are presented. The experiments were performed on a series of twelve balloon ights, including several long duration Australia to South America and Antarctic circumpolar ights. No clear evidence is seen for a spectral break. Both the hydrogen and the helium spectra are consistent with power laws over the entire energy range, with integral spectral indices 1. 80 ⁰. 04 and for the protons and helium, respec-1. 68 ~0. 06 `0. 04 tively. The results are fully consistent with expectations based on supernova shock acceleration coupled with a "" leaky box model of propagation through the Galaxy.
Asakimori et al. (Mon,) studied this question.