Systematic Properties of the 1/2 [660] i13/2 Bands in Odd-A Au Nuclei

A standard in-beam gamma-spectroscopy experiment for Au-179 has been performed via the Sm-149 (Cl-35, 5n) reaction at beam energies of 164-180 MeV Based on the analysis of the experimental results, a rotational band built on the 1/2[660](pii(13/2)) proton intruder orbital is established for Au-179 for the first time. Systematic properties of the 1/2[660](i(13/2)) band in odd-A Au nuclei are discussed, and the evolution of bandhead energy and deformation with changing neutron number are revealed.