Microscopic analysis of the 12C(α, γ)16O reaction

Electric transition probabilities in the 16O spectrum, and the 12C(α, γo,3 16O capture cross sections are calculated with antisymmetric wave functions by the generator coordinate method. The influence of bound states on radiative capture is shown to be automatically included in the model. The reduced α-widths of the 16O bound states are discussed, and compared with previous theoretical and experimental estimates. The microscopic E2 capture cross sections to the O+ 1 and 21 + states yield an astrophysical S-factor of 0.09 MeV · b at 0.3 MeV. An attempt to treat the El multipolarity by relaxing the long-wavelength approximation leads to a large underestimation of the γ-widths. Adopting the experimental γ- width and the theoretical reduced α-width of the 11 - state provides sE1 = 0.30 MeV · b at 0.3 MeV. © 1984.SCOPUS: ar.j