Protons from Carbon and Aluminum Bombarded by Deuterons

The design of a cloud chamber and the technique of its use are described. With it a study of the protons from deuteron bombardment of carbon and aluminum has been made. The group corresponding to the ground state of C¹³ appears to be single. The protons from Al²⁷ show a general distribution in agreement with the work of McMillan and Lawrence; but analysis into groups is difficult as there appear to be many such, with small spacing. Curves are shown from which any group structure can be inferred. The homogeneity of the deuteron beam was tested by scattering the deuterons from a thin gold foil: It is homogeneous to within 0.15 Mev.