Abstract
Capture gamma-ray spectra of 16O, 28Si and 32S have been measured to investigate the mechanism of neutron capture in s-wave and p-wave resonances with large reduced neutron width. Observed gamma-ray transitions from the 434-keV p3/2-wave resonance of 16O exhibit typical features of valence neutron capture in light nuclei. For the 565-keV and 806-keV p3/2-wave resonances of 28Si, a particle-vibrator coupling model indicates that in these resonance states core excitation is essential to explain the observed partial radiative widths. There is also some possibility of core excitation in the 203-keV p1/2-wave resonance capture in 32S. Moreover, a strong correlation between partial radiative widths and spectroscopic factors of the final states was found for gamma-ray transitions from the 188-keV s-wave resonance of 28Si and the 103-keV s-wave resonance of 32S. A discussion follows on the particle-core coupling scheme in these resonance capture transitions.
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