Beta decay of neutron-rich nucleus 208Hg

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