Indirect determination of the astrophysical S factor for the Li6 ( p,γ)Be7 reaction using the asymptotic normalization coefficient method

The 6Li(p,γ) 7Be cross section influences a variety of astrophysical scenarios, including big-bang and stellar nucleosynthesis. In recent years, conflicting results of direct measurements have been published, reporting contradictory low-energy trends. To shed light on the contradiction between the existing data sets, the reaction was studied using the asymptotic normalization coefficient (ANC) technique which was up-to-now never used for this reaction. To derive the ANC, the 6Li(3He,d) 7Be transfer reaction, studied at the Department of Physics and Astronomy of the University of Catania and at the John. D. Fox Superconducting Accelerator Laboratory at Florida State University, was re-analyzed, focusing on the proton transfer mechanism [the α transfer process is discussed by Kiss et al. [Phys. Lett. B 807, 135606 (2020)]. Here, the energy of the 3He beam impinging on a 6Li target was Elab = 3 MeV and Elab = 5 MeV. The yield of the emitted deuterons was measured with high precision by using silicon ΔE – E telescopes.