Abstract
The effects of any difference between the distributions of mass density within mesons and nucleons on the meson showers resulting from very high-energy meson-nucleon or nucleon-nucleon collisions are investigated. It is shown that by a reasonable choice of the mass-density distributions one can explain most of the rougher features of meson showers on strictly kinematical grounds, without reference to any special theory of the interaction. Such must be used only to compute the multiplicity of the shower. An analysis of the very few accurately measured cases shows that the observed multiplicity can be explained by any one of the principal existing theories. It is concluded that only a great many experiments can decide in favour of one particular theory.
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