Study of the ³He(α,γ)⁷Be and ³H(α,γ)⁷Li reactions at astrophysical energies

Abstract

We have studied the important astrophysical ³He(α,γ)⁷Be and ³H(α,γ)⁷Li reactions in the framework of a potential model. ³He(α,γ)⁷Be and ³H(α,γ)⁷Li processes are key reactions in both bigbang nucleosynthesis and the p-p chain of hydrogen-burning in stars. The stellar ³He(α,γ)⁷Be and ³H(α,γ)⁷Li reactions were analyzed at low energies on the basis of a direct radiative capture mechanism. The astrophysical S-factors near zero energy were calculated without using the effective expansion of the S-factor or the asymptotic wave functions. In this paper, ³He(α,γ)⁷Be and ³H(α,γ)⁷Li radiative capture reactions at very low energies are taken as a case study. Using the M3Y potential, we have calculated the astrophysical S-factors for the E1 transition. In comparison with other theoretical methods and available experimental data, excellent agreement is achieved for the astrophysical S-factors of these processes.