The elastic scattering of protons by helium-4, and the elastic scattering of helium-3 by helium-4

In the present work two nuclei have been investigated by the elastic scattering of charged particles of spin 1/2 from spin 0 nuclei. In the first experiment protons were scattered from He4 yielding information on the compound nucleus Li5. A phase shift analysis of the angular distributions has been done. The results of experiments from 1 to 18 mev of proton bombarding energy have been collected, and the resulting phase shifts have been interpreted in the light of the dispersion theory. In the second experiment He3 nuclei were scattered from He 4 giving information about the compound nucleus Be7. The second excited state of Be7 has been investigated, and the level parameters have been determined. The non-resonant phase shifts show a somewhat anomalous behaviour in the energy range investigated, and these phase shifts have been qualitatively interpreted in terms of other levels in Be7.\nThe phase shift analysis of these experiments has been done on an IBM 650 computer, and as a by-product of the analysis, the angular distributions of spin polarization are generated as a function of energy by the computer. Contour maps of spin polarization will be presented for each of the two experiments considered.