The Astrophysical S Factor of the p + 7Be Radiative Capture Reaction

One of the key nuclear processes for heavy element creation in stellar and primordial nucleosyntheses is the 7Be (p, ) 8B radiative capture reaction. At very low energies, Effective Field Theory (EFT) provides a model-independent framework for describing physical observables. At the energy range studied, we calculated the S-factor for the E1 transition of the p + 7Be Radiative Capture Reaction (0–0. 5 MeV). The leading M1 contribution is relevant at energies 600 keV around the 1^+ resonance, although it is negligible. In comparison to other experimental and theoretical investigations, the astrophysical S factor values extrapolated to zero energy are determined to be S17 (0) = 20. 90 eV. b and S17* (0) = 21. 13 eV. b for EFT and EFT*, respectively.