States inAu197from the (n,n'γ) reaction

Abstract

The level structure of $^{197}\mathrm{Au}$ has been studied using the ($n,{n}^{'}\ensuremath{\gamma}$) reaction. A germanium detector array (GEANIE) for \ensuremath{\gamma}-ray detection and the ``white'' neutron source at LANSCE/WNR were used for the measurement. The energy of the incident neutrons was determined using the time-of-flight technique. Partial \ensuremath{\gamma}-ray cross sections were measured for a total of 90 transitions of $^{197}\mathrm{Au}$. A total of 52 new \ensuremath{\gamma} rays were assigned to $^{197}\mathrm{Au}$ and placed on the level scheme based on the partial \ensuremath{\gamma}-ray excitation functions and the $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ coincidence data. The level scheme of $^{197}\mathrm{Au}$ is now more complete up to ~2 MeV excitation energy. The first excited states of the decoupled band built on the proton-hole ${h}_{11/2}$ configuration were established.