Astrophysical reaction rate of C-12(alpha, gamma)O-16

A new astrophysical reaction rate of C-12(alpha, gamma)O-16 has been calculated based on our recent determination of the E1- and E2-capture cross sections. The R-matrix method has been applied to describe the S-E1- and S-E2-factor functions as well as the data of elastic alpha scattering and the beta-delayed alpha decay of N-16 from other experiments. The resulting reaction rate for stellar temperatures of T-9 = 0.04-10 is presented in both tabular form and an analytic expression. A new temperature dependence of the reaction rate was obtained when compared with reported evaluations. The associated uncertainties were reduced considerably in comparison to previous determinations.