Pb208(He3, α)Pb207Reaction at 47.5 MeV

The absolute differential cross sections for the six lowest-lying levels of ${}_{}{}^{207}{}_{}{}^{}\mathrm{Pb}$ excited by the ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}({}_{}{}^3{}_{}{}^{}\mathrm{He}, \alpha ){}_{}{}^{207}{}_{}{}^{}\mathrm{Pb}$ reaction have been measured for 47.5-MeV incident energy. A distorted-wave analysis yields relative spectroscopic factors which are apparently not in good agreement with those obtained from the ($d, t$) reaction. Transitions with large $l$ transfer are strongly favored over those with small $l$. Further, the theoretical predictions for small $l$ are sensitive to the treatment of the contributions from the nuclear interior. The precise value of $l$ is not easily determined from angular-distribution measurements at this bombarding energy.