Three-Body Model Analysis of Subbarrier α Transfer Reaction

Subbarrier alpha transfer reaction (13)C((6)Li, d)(17)O(6.356 MeV, 1/2(+)) at 3.6 MeV is analyzed with an alpha + d+(13)C three-body model, and the asymptotic normalization coefficient (ANC) for alpha+(13)C -> (17)O(6.356 MeV, 1/2+), which essentially determines the reaction rate of (13)C(alpha,n)(16)O, is extracted. Breakup effects of (6)Li in the initial channel and those of (17)O in the final channel are investigated with the continuum-discretized coupled-channels method (CDCC). The former is found to have a large back-coupling to the elastic channel, whereas the latter turns out to be significantly small. The transfer cross section calculated with Born approximation to the transition operator, including breakup states of (6)Li, gives (C(alpha 13C)(17)O*)(2) = 1.03 +/- 0.29 fm(-1). This result is consistent with the value obtained by the previous DWBA calculation.