Test of the triaxial rotor model and the interacting boson-fermion approximation model description of collective states inIr193

Coulomb excitation of states in ${}_{}{}^{193}{}_{}{}^{}\mathrm{Ir}$ up to J=(21/2) has been observed with 160-MeV ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}$ and 617-MeV ${}_{}{}^{136}{}_{}{}^{}\mathrm{Xe}$ ions. Most of these states are grouped into three rotational-like bands based on the ${\mathrm{}(3/2)\mathrm{}}^{+}$ ground state, the ${\mathrm{}(1/2)\mathrm{}}^{+}$ first excited state, and the ${\mathrm{}(7/2)\mathrm{}}^{+}$ γ-vibrational-like state at 621 keV. The average deviation between experimental and theoretical energies for 18 states is 54 keV for the particle-asymmetric-rigid-rotor model and 66 keV for the interacting boson-fermion approximation model [limited to broken Spin(6) symmetry and only the $d_{3/2}$ orbital is considered]. The overall agreement of both model predictions with experimental γ-ray yields for the collective transitions within the ${\mathrm{}(3/2)\mathrm{}}^{+}$ band is quite good.