Elsevier

Nuclear Physics A

Volume 410, Issue 2, 28 November 1983, Pages 334-348
Nuclear Physics A

The 12C(α, γ)16O reaction at stellar energies

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Abstract

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.

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    Supported in part by the National Science Foundation [PHY82-07332 and PHY79-23638].

    On leave from the University of Münster.

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