Neutron resonance spectroscopy. XV. The separated isotopes of Cd

The results of neutron time of flight spectroscopy measurements for the separated Cd isotopes (110, 112, 114, 116) and for natural Cd, using the Nevis synchrocyclotron, are given. Transmission and self-indication measurements were made for a range of sample thicknesses for natural Cd, and for each of the above even A separated isotopes. Resonance parameters, E₀ and (g)Γₙ⁰ are given to {~} 10 keV for 110, 112, 114, 116, and to 2.3 keV for 111 and 113. The ¹¹¹Cd level assignment is from recent published measurements at the Oak Ridge electron linear accelerator using a sample enriched in ¹¹¹Cd. Levels in ¹¹³Cd are those stronger ones seen in natural Cd, but not identified as due to other isotopes. We also obtained level parameters to {~} 10 keV for 181 levels which have no isotopic assignment. Many resonance Γ_γ and J values were obtained for 111 and 113, and a few Γ_γ values for even A isotopes, with 〈Γ_γ〉 of each isotope being between 100 and 110 meV. The 10⁴S₀ values are 0.50 ±{} 0.10, 0.38 ±{} 0.06, 0.53 ±{} 0.09, 0.43 ±{} 0.07, 0.70 ±{} 0.19, and 0.20 ±{} 0.06 for 110, 111, 112, 113, 114, and 116, respectively. Comparison of the (gΓₙ⁰)1/2 distributions with Porter-Thomas theory for 110, 112, 114, and 111 shows that many p levels are observed. An estimate of the level detection sensitivity and a Bayes's theorem analysis permit us to identify the detected p levels, and to determine the p strength function with a relatively small uncertainty. Few expected missing weak s levels for each of these isotopes were then added to their p level subtracted sets. Various statistical tests were applied, showing that the final s level selection choices for 110, 112, 114 and 111 are in good agreement with the orthogonal ensemble theory. The 10⁴S₁ values for 110, 112, 114, and 111 are 2.8 ±{} 0.6, 2.5 ±{} 0.5, 3.2 ±{} 1.0, and 3.5 ±{} 0.7. The $〈D〉$ values for s population are (174 ±{} 18) eV (110); (24.0 ±{} 1.5) eV (11); (137 ±{} 8) eV (112); (22.1 ±{} 3.8) eV (113); (183 ±{} 29) eV (114); and (264 ±{} 38) eV (116).NUCLEAR REACTIONS 110,111,112,113,114,116Cd(n,n), n,γ, E=0-10 keV; measured σₜ(E); deduced E₀, gΓₙ, Γ_γ, J, S₀, 〈D₀〉, S₁; O.E. theory test.