Study of Pb206 by means of the Bi209(p→,α)206Pb reaction

The Bi209(p→,α)206Pb reaction has been studied at an incident proton energy of 22 MeV using a polarized proton source and a quadrupole-dipole-dipole-dipole spectrometer. The differential cross sections and asymmetries for transitions to levels of Pb206 up to an excitation energy of 5.333 MeV have been measured. Evidence for the presence of multiplets of Pb206 states homologous to the parent Tl205 states is discussed. The differential cross sections and asymmetries for the transitions to these homologous states are interpreted in terms of the experimental differential cross sections and asymmetries of the parent states as well as by theoretical calculations using both conventional Woods-Saxon and double-folded α-particle potentials. The differential cross sections and asymmetries for the low-energy states of Pb206 which involve the pickup of the h9/2 proton outside the closed shell are analyzed.