By means of a finite-range distorted-wave Born-approximation program which exactly includes recoil, $\alpha$ spectroscopic factors are extracted from the (${}_{}{}^6{}_{}{}^{}\mathrm{Li},d$) and (${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$) reactions on ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$. The production of ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}_{}^{*}{}_{}{}^{}$($2^{+}$) is correctly predicted to be suppressed. The results are consistent with the assumption of an $\alpha$-particle transfer as dominant in the two reactions.

• Received 6 December 1972

DOI:https://doi.org/10.1103/PhysRevLett.30.666