Excited states in ${}^{196}\mathrm{Au},$ populated in the ${}^{196}\mathrm{Pt}\mathrm{}(p,n)\mathrm{}$ and $\mathrm{}(d,2n)\mathrm{}$ reactions, were investigated by in-beam $\gamma$-ray and conversion-electron spectroscopy. Two only weakly connected level structures, built on the $2^{-}$ ground state (negative-parity level scheme) and on the $5^{+}$ isomer at $84.7$ keV (positive-parity level scheme), are observed. The point of main effort of the present work was the investigation of the negative-parity level scheme in connection with its description within the framework of an extended supersymmetry. For this level scheme we observe 25 excited states up to an excitation energy of $500$ keV, of which 23 had already been identified in a recent study of ${}^{196}\mathrm{Au}$ by transfer reactions. From 500 to $800$ keV we observe 28 additional levels compared to 20 levels observed in the transfer reactions. The excitation energies derived in the studies of the $\mathrm{}(p,n)\mathrm{}$ compound reaction and the $\mathrm{}(p,d)\mathrm{}$ transfer reaction agree within 1 keV, and the complementary information obtained from the two reactions led to improved spin determinations. The negative-parity level structure is compared with the predictions of the extended supersymmetry.

• Received 26 May 2000

DOI:https://doi.org/10.1103/PhysRevC.62.064304