Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2001-02-12
Phys.Rev. C63 (2001) 054002
Physics
Nuclear Physics
Nuclear Theory
18 pages, 10 figures, submitted to Phys Rev C
Scientific paper
10.1103/PhysRevC.63.054002
We report the first calculations of cross sections for the radiative capture reactions t(alpha,gamma)^7Li and ^3He(alpha,gamma)^7Be below 2 MeV which use wave functions derived from realistic nucleon-nucleon interactions by the variational Monte Carlo technique. After examining several small corrections to the dominant E1 operator, we find energy dependences for the low-energy S-factors which agree reasonably with experimental measurements. There is no contradiction with the previous theoretical understanding of these processes, but the zero-energy derivative of the t(alpha,gamma)^7Li S-factor is smaller than in most models. While this method can in principle predict cross section normalizations, the normalizations of our results are mostly too low.
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