A full finite-range distorted-wave Born-approximation formalism is used to calculate the two-neutron transfer reactions ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}(p, t){}_{}{}^{16}{}_{}{}^{}\mathrm{O}(\mathrm{g}.\mathrm{s}.\mathrm{})$, ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}(t, p){}_{}{}^{42}{}_{}{}^{}\mathrm{Ca}(\mathrm{g}.\mathrm{s}.\mathrm{})$, and ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}(p, t){}_{}{}^{206}{}_{}{}^{}\mathrm{Pb}(\mathrm{g}.\mathrm{s}.\mathrm{})$. It is found that the shape of the differential cross section is well predicted in the forward direction for all nuclei studied, but the normalization is given correctly only for ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$.

NUCLEAR REACTIONS ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}(p, t)$, $E=20\mathrm{}$ MeV; ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}(t, p)$, $E=10.1\mathrm{}$ MeV; ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}(p, t)$, $E=35\mathrm{}$ MeV; ground state transitions. Calculated $\sigma \left(\theta \right)$. Finite-range DWBA.

• Received 18 February 1975

DOI:https://doi.org/10.1103/PhysRevC.12.351