Abstract
The interaction of 970 MeV protons with helium has been studied with a high-pressure diffusion cloud chamber. From 642 events the total and absorption cross-sections were found to be 116 ± 17 mb and 93 ± 13 mb, respectively. These agree with values obtained by extrapolation of known cross-sections for more complex nuclei, and the results are interpreted in terms of the optical model of the nucleus. The angular distribution for elastic-scattering yields an
α
-particle radius of 1⋅8 x 10
-13
cm. Quasi-elastic proton-proton and proton-neutron scattering, and more particularly charged meson production, show that the
α
-particle has some individual particle characteristics. Meson reabsorption appears unimportant.
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