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Systematics of B(E3) Values in the Trans-Lead Region

B (E3) values in the trans-lead region lie in a region of about 1-50 Weisskopf units. Of particular interest are those cases which with a relatively small scattering are grouped around effective B (E3) values of 22 and 35 W.u. The former cases are due to fast single particle transitions of the type πi13/2 → πf7/2 or νj15/2 → νg9/2 Where the initial states are mixed with the final state plus the 3- octupole excitation of the core of 208Pb. Transitions with very high B (E3) values are likely to be associated with mixed configurations both in the initial and final states allowing fast proton as well as neutron transitions. The proton transitions are taken care of by the valence protons and the neutron transitions by core deexcitations. The quantitative relation between different groups of B (E3) values are illustrated by analyzing the E3 decay of the core excited 16+ and 39/2- isomeric states 210Po and 211At, respectively.