A broad structure has been observed in ($p,t$) reactions on the tin isotopes ${}_{}{}^{112}{}_{}{}^{}\mathrm{Sn}$, ${}_{}{}^{116}{}_{}{}^{}\mathrm{Sn}$, ${}_{}{}^{118}{}_{}{}^{}\mathrm{Sn}$, ${}_{}{}^{120}{}_{}{}^{}\mathrm{Sn}$, ${}_{}{}^{122}{}_{}{}^{}\mathrm{Sn}$, and ${}_{}{}^{124}{}_{}{}^{}\mathrm{Sn}$ between 7 and 9 MeV of excitation energy. The width of the peak has a minimum of around 1.9 MeV for the reaction ${}_{}{}^{116}{}_{}{}^{}\mathrm{Sn}(p,t)$ and increases for both the ${}_{}{}^{112}{}_{}{}^{}\mathrm{Sn}(p,t)$ reaction and for the heavier tin targets, but the excitation energy of the structure increases with mass number. The measured angular distributions of the bump in ${}_{}{}^{110}{}_{}{}^{}\mathrm{Sn}$, ${}_{}{}^{114}{}_{}{}^{}\mathrm{Sn}$, and ${}_{}{}^{120}{}_{}{}^{}\mathrm{Sn}$ agree reasonably well with single-step, distorted-wave Born approximation calculations. The widths of the peaks observed in two neutron transfer show the same trends with mass number as the widths of the single hole states observed in one neutron transfer reactions. It appears that the peak contains components which arise from the pickup of one particle from a deep orbit and one particle from a valence orbit, plus possibly some contribution from pickup of two particles from deep orbits.

NUCLEAR REACTIONS ${}_{}{}^{112,116,118,120,122,124}{}_{}{}^{}\mathrm{Sn}\mathrm{}(p,t)\mathrm{}$, ${}_{}{}^{117,119}{}_{}{}^{}\mathrm{Sn}\mathrm{}(p,d)\mathrm{}$; $E=42\mathrm{}$ MeV; ${}_{}{}^{110,114,116,118,120,122}{}_{}{}^{}\mathrm{Sn}$ measured $E_x$, $\Gamma$; ${}_{}{}^{110,114,120}{}_{}{}^{}\mathrm{Sn}$ measured $\sigma \left(\theta \right)$. DWBA analysis; enriched targets, resolution 40 keV.

• Received 25 August 1980

DOI:https://doi.org/10.1103/PhysRevC.23.589