Abstract
209Po, with one neutron less and two protons more than 208Pb, has been studied in the electron capture decay of 209At. Most of the observed states below 2 MeV excitation can be interpreted as having dominant components corresponding either to one-neutron-hole states or to the coupling of a p1/2 neutron hole to (h9/2)2J ≠ O configurations. Several M1 and E2 transition rates were measured. These, as well as level energies, generally show good agreement with theory. The main part of the 209At electron capture decay proceeds to a 9/2+ level at 2 312 keV, which is interpreted as a core-excited state.
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