p-Wave Resonances inCd111(n,γ)Cd112

Abstract

$\gamma$-ray spectra and total capture yields were measured for resonant neutron capture in an enriched ${}_{}{}^{111}{}_{}{}^{}\mathrm{Cd}$ sample for neutron energies less than 2.3 keV. The experiment utilized the 40-m flight path of the Oak Ridge electron linear accelerator and a nonhydrogenous liquid-scintillator $\gamma$-ray detector. A total of 162 resonances were observed in this interval, and the resonance energies and neutron widths deduced. Approximately 14% of the resonances are assigned to $p$-wave capture on the basis of the $\gamma$-ray spectral measurements while an additional 23% are assigned to $s$-wave capture on the basis of their large neutron widths. The parity of the remainder is undetermined. A lower limit of 0.9 × ${10}^{-4\mathrm{}}$ is observed for the $p$-wave neutron strength function [$\Sigma \frac{g\Gamma _n^{}{}_{}{}^1}{\mathrm{}(2l+1)\mathrm{}\Delta E}$] while the $s$-wave neutron strength function [$\Sigma \frac{g\Gamma _n^{}{}_{}{}^0}{\Delta E}$] is 0.15 × ${10}^{-4\mathrm{}}$.