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Differential energy spectra of cosmic-ray protons and He nuclei have been measured for the first time by an ionization spectrometer flown at balloon altitudes. The energy range extended from 50 to > 1000 GeV. The observed differential intensities can be represented with power-law spectra with a slope of -2. 75 0. 03 for protons and of -2. 77 0. 05 for He nuclei. The proton-to-He ratio is 26 3 at 40 GeV/nucleon and is constant within errors up to 400 GeV/nucleon.
Ryan et al. (Mon,) studied this question.
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