Theory of Scattering of Protons by Protons

quantitatively in agreement, as regards 'magnitudes, variation with angle, and variation with voltage, with a simple phase shift of the spherically symmetrical de Broglie wave ("S wave") due to the collision or scattering, corresponding to a new attractive force overpowering the Coulomb repulsion, and give a rather accurate measure of the "potential well" which is therefore permissible as representing the interaction. Interestingly enough, this potential well appears to be identical, within the limits of error of both determinations, with the potential well which represents the proton-neutron interaction as derived from the scattering and absorption of slow neutrons. Furthermore, the magnitude of interactions thus determined by scattering experiments is in very satisfactory agreement with that used successfully for calculations of mass defects of light nuclei. * It thus appears that a *A very readable discussion in this connection is given by Bethe in Rev. Mod. Phys. 8, 82 (1936). real beginning has been made toward an accurate and intimate knowledge of the forces which bind together the "primary particles" into the heavier nuclei so important in the structure and energetics of the material universe.