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

A standard in-beam γ-spectroscopy experiment for 179Au has been performed via the 149Sm (35Cl, 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](πi13/2) proton intruder orbital is established for 179Au for the first time. Systematic properties of the 1/2[660](i13/2) band in odd-A Au nuclei are discussed, and the evolution of bandhead energy and deformation with changing neutron number are revealed.