In-beam studies of high-spin states in {sup 184}Hg and {sup 193}Hg and polarization studies
The high-spin states in {sup 184}Hg and {sup 193}Hg were studied by using the reactions {sup 156}Gd({sup 32}S, 4n){sup 184}Hg, in the spin spectrometer and {sup 150}Nd ({sup 48}Ca, 5n){sup 193}Hg, in the {gamma}-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 {sup 184}Hg based on {gamma}-{gamma} 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{sup +} state. One new band in {sup 184}Hg has a moment of inertia very similar to that of the s-band in {sup 186}Hg which is assigned a [651, 1/2] {circle_times} [770, 1/2] neutron configuration. However, it starts with a spin state of 5{h_bar}, while the s-band in the {sup 186}Hg starts with a I{sup {pi}} = 11{sup {minus}} state. Some other bands were found in {sup 184}Hg which are similar to ones in {sup 186}Hg. However a pair of signature partner bands without signature splitting not seen in {sup 186}Hg is observed. It shows the same alignment pattern below the band crossing with the bands in {sup 182}Pt and {sup 180}Os lying in the N = 104 chain which consist of a v(i{sub 3/2}H{sub 9/2}) or v(i{sub 3/2}f{sub 7/2}) configuration. A decay sequence above the 47/2, 5.4 MeV level in {sup 193}Hg was established through discrete {gamma}-ray spectroscopy. This sequence was shown to feed several previously known levels in {sup 193}Hg. 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.
- Research Organization:
- Vanderbilt Univ., Nashville, TN (United States)
- OSTI ID:
- 98653
- Country of Publication:
- United States
- Language:
- English
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