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We report the first calculations of cross sections for the radiative capturereactions t(alpha,gamma)^7Li and ^3He(alpha,gamma)^7Be below 2 MeV which usewave functions derived from realistic nucleon-nucleon interactions by thevariational Monte Carlo technique. After examining several small corrections tothe dominant E1 operator, we find energy dependences for the low-energyS-factors which agree reasonably with experimental measurements. There is nocontradiction with the previous theoretical understanding of these processes,but the zero-energy derivative of the t(alpha,gamma)^7Li S-factor is smallerthan in most models. While this method can in principle predict cross sectionnormalizations, the normalizations of our results are mostly too low.Comment: 18 pages, 10 figures, submitted to Phys Rev

Radiativeα-capture cross sections from realistic nucleon-nucleon interactions and variational Monte Carlo wave functions