The new neutron-rich nuclide Hg-209 has been identified for the first time.
An on-line, gas-thermochromatographic technique was developed for rapidly
separating mercury isotopes produced by 600MeV O-18 + (nat)pb (thick target
) reaction. A special detection method was used to detect the beta(-)-delay
ed gamma rays from, neutron-rich mercury isotopes. The half-life of Hg-209
was determined to be 35(-6)(+9)s.