The α-transfer reaction on ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ was measured using a ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ beam at 109 MeV. The reaction mechanism shows characteristics of a direct α-transfer process with a preferential high-spin population. However, the comparison with the ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$${(}^{13}$C, ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$${)}^{20}$Ne reaction at 105 MeV, which was reported as a direct transfer reaction, shows large differences in the angular distributions and relative cross sections inside the same band. In order to understand those differences, both data were analyzed using the exact finite-range distorted-wave Born approximation code with the same method and parameters assuming a direct α-cluster transfer. The calculated results showed qualitative agreement with the data.

• Received 28 May 1985

DOI:https://doi.org/10.1103/PhysRevC.32.1558