On the origin of the charge spectrum of the primary cosmic radiation
We find that we can account quite well for the observed primary charge distribution by assuming (quite artificially) a model in which the original radiation consists only of iron (*). After about three mean free paths (6 g/cm2) a charge distribution is obtained which resembles very much the observed values. The good agreement is possible only if one uses results on «p » and «α» fragments obtained from meteorite measurements, and if one uses the smaller fragmentation probabilities obtained by the Bristol group for Li, Be and B.
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