The ${}_{}{}^{207}{}_{}{}^{}\mathrm{Pb}\mathrm{}(t,p)\mathrm{}{}_{}{}^{209}{}_{}{}^{}\mathrm{Pb}$ reaction has been performed at 20 MeV. The excitation of the single-particle states is used as a normalization for the distorted-wave code of Bayman and Kallio. A large number of two-particle-one-hole states are seen in the excitation region examined, the first (the ${\mathrm{½}}^{-}$) being at 2.152 MeV. The remaining states are interpreted as being multiplets of the [$p_{\frac{1}{2}}^{}{}_{}{}^{-1\mathrm{}}\left|{}_{}{}^{210}{}_{}{}^{}\mathrm{Pb}\mathrm{}\right(J)\mathrm{}〉$] configurations. The magnitudes and energy centroids of the observed states are compared with those observed in the ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}\mathrm{}(t,p)\mathrm{}{}_{}{}^{210}{}_{}{}^{}\mathrm{Pb}$ experiment and also with the theoretical treatment of a particle coupling to multipole pairing and particle-hole fields.

• Received 12 October 1970

DOI:https://doi.org/10.1103/PhysRevC.3.2371