Analysis of the 3He(α,γ)7Be and 3H(α,γ)7Li astrophysical direct capture reactions in a modified potential-model approach

Astrophysical S factors and reaction rates of the direct radiative capture processes He3(α,γ)7Be H3(α,γ)7Li, as well primordial abundance Li7 element, are estimated in framework a modified two-body potential model. It is shown that suitable modification phase-equivalent α−3He potentials d waves can improve description astrophysical factor for at energies above 0.5 MeV. An Li/H7 ratio (4.89±0.18)×10−10 very good agreement with recent measurement (5.0±0.3)×10−10 by LUNA collaboration.