Abstract
Thick targets of high purity aluminium and niobium were bombarded with /sup 16/O ions in the energy range 50--65 MeV. The yields of reaction products were obtained off-line using a Ge(Li) detector to observe residual ..gamma.. activities. Ungated ..gamma.. spectra in coincidence with pairs of 511 keV annihilation quanta, observed in an array of four 7.5 x 7.5 cm NaI(T1) detectors, were recorded. Upper limits of 0.2 ..mu..b and 0.1..mu..b were obtained for the /sup 27/Al(/sup 16/O,..gamma..)/sup 43/Sc and /sup 93/Nb(/sup 16/O,..gamma..)/sup 109/In radiative capture cross sections, respectively. These limits are compared to previously reported data and to the results of statistical model calculations. It is concluded that some previously reported total heavy-ion radiative capture results may be in error and tentative explanations for this are offered.
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