The most recent experimental data on the 12C(α, γ)16O reaction at energies Ec.m. ≲ 3 MeV have been analysed to determine the astrophysical S-factor. The absolute E2 capture cross section was calculated in a microscopically based direct capture model, while the E1 cross section was described by the hybrid R-matrix model. We find that the E2 rate is less than 4% of the E1 rate at astrophysically important energies. The two sets of data yield S-factors at Ec.m. = 300 keV of 0.15 MeV · b and 0.34 MeV · b.
ASJC Scopus subject areas
- Nuclear and High Energy Physics