Pb208(t, α)Tl207andPb207(t, α)Tl206Reactions at 20 MeV

The proton pickup reaction ($t, \alpha$) has been used to investigate states in ${}_{}{}^{207}{}_{}{}^{}\mathrm{Tl}$ and ${}_{}{}^{206}{}_{}{}^{}\mathrm{Tl}$. The angular distributions resulting from populating five states in ${}_{}{}^{207}{}_{}{}^{}\mathrm{Tl}$ which are predominantly single-hole in character have been analyzed to obtain spectroscopic factors. In the ${}_{}{}^{207}{}_{}{}^{}\mathrm{Pb}(t, \alpha ){}_{}{}^{206}{}_{}{}^{}\mathrm{Tl}$ spectrum, doublets corresponding to the interaction of proton holes in the four lowest-lying orbits with a $3p_{\frac{1}{2}}$ neutron hole are the strongest states observed. The $2d_j$ proton-hole strength is found in several levels of ${}_{}{}^{206}{}_{}{}^{}\mathrm{Tl}$. The positions and intensities of the observed levels are in quantitative agreement with the nuclear-structure calculations of Kuo.