LDependence in Angular Distributions of the Two-Proton Transfer ReactionCa48(O16,C14)Ti50

The reaction ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}$)${}_{}{}^{50}{}_{}{}^{}\mathrm{Ti}$ to the lowest ${\mathrm{O}}^{+}$, $2^{+}$, $4^{+}$, and $6^{+}$ states of ${}_{}{}^{50}{}_{}{}^{}\mathrm{Ti}$ has been studied at 56 MeV. Rapid oscillations in the angular distribution persist to extreme forward angles (${\theta }_L=3\mathrm{}°$). In the present data, the forward-angle structure is found to be an unambiguous indicator of the transferred angular momentum. The data are reproduced by distorted-wave Born-approximation calculations. A qualitative understanding is obtained in the strong-absorption model. It is believed that such behavior will occur in many heavy-ion-induced transfer reactions.