Capture-Gamma-Ray Spectrum of Cd113(n, γ)Cd114 and the Associated Energy Levels in Cd114

Abstract

The capture gamma-ray spectrum of ${\mathrm{Cd}}^{113}(n, \gamma ){\mathrm{Cd}}^{114}$ was investigated with the Argonne 7.7-m bent-crystal spectrometer. The observed spectrum consisted of 119 gamma rays with energies below 2 Mev. These precision energy measurements were combined with a series of coincidence experiments to modify and extend the level scheme of ${\mathrm{Cd}}^{114}$. The errors in the energy values of five previously observed levels are reduced by a factor of 10. Their new values are found to be 557.8±0.1, 1208.4±0.2, 1282.2±0.2, 1304.9±0.3, and 1362.9±0.3 kev. Five new levels are established at 1133.1±0.2, 1730.3±0.2, 1839.9±0.3, 1958.3±0.3, and 2202.4±0.3 Mev. Eight more levels are suggested at 1607.8±0.3, 2048.3±0.4, 2225.1±0.4, 2392.5±0.4, 2573.8±0.5, 2868.0±0.7, 3216.8±0.8, and 3484.7±0.8 kev. The limits placed on the spins and parities of these levels by the observed capture gamma rays are discussed.