In-beam studies of high-spin states in 184Hg and 193Hg and polarization studies

The high-spin states in 184Hg and 193Hg were studied by using the reactions 156Gd(32S, 4n)184Hg, in the spin spectrometer and 150Nd (48Ca, 5n)193Hg, in the γ-ray spectrometer, respectively, with the beams provided by the 25 MV tandem accelerator at the Holifield Heavy Ion Research Facility. Seven new rotational bands were observed for the first time in 184Hg based on γ-γ coincidences with the use of a multiplicity filter. Spin assignments were based on the measured directional correlations for oriented nuclei (DCO ratios). The well-deformed prolate band was tentatively extended to 26+ state. One new band in 184Hg has a moment of inertia very similar to that of the s-band in 186Hg which is assigned a [651, 1/2] circle-times [770, 1/2] neutron configuration. However, it starts with a spin state of 5ℎ, while the s-band in the 186Hg starts with a Iπ = 11- state. Some other bands were found in 184Hg which are similar to ones in 186Hg. However a pair of signature partner bands without signature splitting not seen in 186Hg is observed. It shows the same alignment pattern below the band crossing with the bands in 182Pt and 180Os lying in the N = 104 chain which consist of a v(i3/2H9/2) or v(i3/2f7/2) configuration. A decay sequence above the 47/2, 5.4 MeV level in 193Hg was established through discrete γ-ray spectroscopy. This sequence was shown to feed several previously known levels in 193Hg. The new energy levels exhibit non-collective single-particle character implying the dominant role of particle alignment mode at the moderate spins. This is in contrast to the collective bands observed in nearby lead isotope