Online Nuclear Orientation Study Of Au-184

The 18Au --> 184Pt decay, studied on-line with the UNISOR facility at HHIRF, is discussed. Gamma-ray and conversion-electron spectroscopy of 184Pt as well as on-line nuclear orientation measurements of 184Au were done. A new low-lying level scheme of 184Pt is proposed. Two coexisting bands with different deformations and their respective gamma-vibrational bands are established. Internal conversion coefficients for interband transitions between states with the same spin are extracted from the spectroscopy measurements. The relative E0 contents of the transitions are determined by combining internal conversion coefficients with E2/M1 mixing ratios deduced from gamma-ray anisotropies measured from oriented nuclei.