Abstract
Differential cross sections sigma(theta) and analyzing powers A(y)(theta) have been measured for neutron scattering from Al-27 and Co-59 at 15 MeV at the Triangle Universities Nuclear Laboratory using standard time-of-flight techniques. In addition, sigma(theta) was measured for Co-59 at 10, 12, 14, 17, and 19 MeV. Two large databases covering the energy range from 0.1 to 80 MeV were formed for these nuclei from this new data and previously published data, including that for the total cross section sigma(T). These sets of data were analyzed using spherical dispersive optical-model (DOM) potentials, as well as coupled-channels model (CCM) potentials. The Co-59 DOM gives good agreement with the sigma(theta) data, except in the region of the first minimum. It also gives a reasonable description of our A(y)(theta) measurement. The Al-27 DOM gives good agreement with the data, except for sigma(theta) at backward angles below 9.4 MeV and for sigma(T), for which there is up to 5% disagreement in the 10-50 MeV range. Compared to the DOM, the Co-59 CCM calculations give improved agreement with the sigma(theta) data, especially at the first minimum. The sigma(T) calculations agree with the data to within about 3% above 1.0 MeV. The three-level CCM calculations for Al-27 give excellent agreement with the entire database.