Theoretical Study on Negative Parity States of ^{191,193,195,197}Au in Particle Triaxial-Rotor Model

By taking the particle triaxial-rotor model with variable moment of inertia, we investigate the energy spectra, the deformation and the single particle configuration of the negative-parity states in nuclei ^{191,193,195,197}Au systemically. The calculated energy spectra agree well with experimental data. The obtained results indicate that the negative-parity states in ^{191,193,195,197}Au originate from the proton-hole h_11/2 configuration coupled to a triaxial oblate Hg core. Meanwhile the main single particle configuration of the bands 1, 2 and 3 are identified to be |5h_11/2 1/2 > (α= - 1/2), |5h_11/2 > (α= 1/2) and |5h_9/2 7/2>;, respectively.