The Isospin Forbidden and Allowed Reactions Oxygen -16

Differential cross sections have been measured for the radiative capture and elastic scattering of alpha particles on 0-16 for incident beam energies between 6.9 and 10.15 MeV. Narrow resonant structures, found in a radiative capture survey that employed a 60 keV thick target and Ge(Li) detectors to observe the gamma decays to the ground and first two excited states, were investigated in further detail. Near each of the eight structures, excitation functions were taken simultaneously of both the radiative capture at 90 deg and the elastic scattering at 14 angles. In addition, an array of NaI crystals measured the on and off resonance angular distributions of the gamma decay at 3 to 7 angles. The results from both reactions have been combined to establish a consistent set of parameters for the compound nuclear, Ne-20, levels. Generally, the results of this work are compatible with previous observations. Analysis of the isospin purity of the T = 1 levels shows that the strength of the mixing force is well within the capabilities of the Coulomb interaction.