Absolute differential cross sections for the elastic scattering of alpha particles from helium have been obtained at 36.8, 38.8, 40.8, 41.9, 44.4, 46.1, 47.1, and 47.3 Mev. Measurements have been made at intervals of 2 degrees over an angular range from about 15 deg to beyond 90 deg in the center of mass system. The angular distribution shows a single minimum at 65 deg at the two lowest energies, and two minima, at about 35 and 70 deg, at the other energies.

• Received 3 September 1959

DOI:https://doi.org/10.1103/PhysRev.117.1075