Beta-Decay γ Scheme of ~(208)Hg

摘要

The β~- decaying γ scheme of the neutron-rich nuclide ~(208)Hg was determined for the first time. The ~(208)Hg was produced in multi-nucleon transfer reaction taking place in the bombardment of ~(18)O-beam on natural lead target, and the Hg-element products were separated with a gas-thermochromatography technique. The γ-ray single and γ-γ coincident spectra were measured. A partial ~(208)Hg γ scheme was proposed, and twenty-six γ rays were assigned to following the β~-decay of ~(208)Hg. At the same time, a new level structure of the daughter nucleus ~(208)Tl was performed, in which three new levels at 1.728 MeV, 1.652 MeV and 1.362 MeV were affirmed. The experimental ~(208)Tl level structure was compared with a shell-model calculation.