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Cluster model of A=7 nuclei revisited, and the astrophysical S factors for 3He(α,γ)7Be and 3H(α,γ)7Li at zero energy

A local potential cluster model treatment of the A=7 nuclei is updated in the light of a recent re-analysis of old experimental data and some new experimental measurements. The model is then used to calculate directly (without any energy extrapolation) the astrophysical S factors for 3He( alpha , gamma )7Be and 3H( alpha , gamma )7Li at zero energy. The authors find S0=0.51+or-0.03 keV b for the former reaction and S0=0.09+or-0.03 keV b for the latter, in good agreement with direct cross section measurements.