Abstract
The radiative capture cross sections for the 3He(α,γ)7Be and the 3H(α,γ)7Li reactions are calculated in the fully microscopic fermionic molecular dynamics approach. A realistic effective interaction derived in the unitary correlation operator method is employed. The model space consists of frozen cluster configurations at large distances and polarized configurations, obtained by variation of the many-body wave functions, in the interaction region. These polarized configurations are essential for the description of the 7Be and 7Li bound states and for the S- and D-wave scattering phase shifts. The calculated capture cross section agrees with both the normalization and the energy dependence of the modern 3He(α,γ)7Be data. In case of the 3H(α,γ)7Li reaction the energy dependence of the most recent data is described well but the normalization is larger by about 15% compared to experiment.
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