A method is outlined within the formalism of the exact finite-range distorted-wave Born approximation to include exchange terms as well as interference terms with the usual direct reaction process. The method is suitable for use with existing finite-range computer codes. An application is presented for the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}({}_{}{}^6{}_{}{}^{}\mathrm{Li},\alpha ){}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ reactions for the ground-state and two-excited-state transitions. The exchange component for the three transitions significantly improved the calculated fits with data suggesting the importance of the exchange mechanism for the reactions in question. The reactions were analyzed at a laboratory energy of 33 MeV.

NUCLEAR REACTIONS Exact finite-range DWBA formalism for direct, exchange, and interference components to angular distributions with application to the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}({}_{}{}^6{}_{}{}^{}\mathrm{Li},\alpha ){}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ reactions, at $E=33\mathrm{}$ MeV.

• Received 31 May 1977

DOI:https://doi.org/10.1103/PhysRevC.16.1882