Abstract
The neutron capture cross section of natural silicon has been measured to 1500 keV using the capture cross section facility at the 40 m station of the Oak Ridge Electron Linear Accelerator. Analysis of the present data, in combination with existing total cross section information, has provided almost complete resonance data for 28Si. On the other hand, the capture kernel only ( gΓ nΓ γ Γ ) has been obtained for neutron capture resonances in 29Si and 30Si. A strong positive correlation has been observed between the radiative width and the corresponding reduced neutron width for p-wave resonances in 28Si, confirming significant valence effects. It is noted that a quantitative valence calculation provides only an approximate estimate of the valence strength for this nucleus. It was not possible to confirm from the present measurements, reported asymmetry observed in two resonances in the 29Si(γ, n) reaction.
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