Abstract
The latest measurements of the energy spectra of protons and helium nuclei show with confidence that there is a significant difference in the shapes, with the proton spectrum being steeper than that of helium. The ratio of the proton to helium intensities falls in the energy range from 30 GeV (where solar modulation ceases) to the maximum energy (as measured) of about 1000 GeV by a factor of The reason for the difference is sought, here, and some possibilities are put forward, of which we consider that the different radial distance from the centre of supernovae, of the elements to be accelerated, is the most likely.
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