Energy Levels and Transitions inAu197from the (n,n′γ) Reaction

The energy levels and transitions of ${}_{}{}^{197}{}_{}{}^{}\mathrm{Au}$ have been examined by high-resolution measurements of the $\gamma$ rays from the ($n,n^{\prime }\gamma$) reaction for incident neutrons between the energies of 0.2 and 2.2 MeV. The level scheme, up to an excitation of 1308 keV, is compared with a recent neutron time-of-flight study, and several new levels are proposed. Differential $\gamma$-ray production cross sections at 95° are given and spin and parity assignments for levels in this nucleus are discussed.