${}^{12}C$ (α,γ $)^{16}$ O cross sections at stellar energies

28 September 1992

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 69 (13) , 1896-1899
https://doi.org/10.1103/physrevlett.69.1896

Abstract

The excitation function of the

{}^{12}C

(α,γ

)^{16}

O reaction and the angular distribution of its γ rays were measured at nine energies ranging from

E_{c . m .}

=1.37 to 2.98 MeV. These measurements allowed the separation of the E1 and E2 contributions and their extrapolation to the region of astrophysical interest. The analysis of the E1 cross sections with a three-level R-matrix method yields a prediction of

1_{- 1}^{+ 6}

keV b for the S factor at

E_{c . m .}

=0.3 MeV. The contribution of E2 transitions at the same energy is 40±7 keV b from a cluster-model analysis of the present data.

Keywords

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C12(α,γ)16O cross sections at stellar energies

Abstract

Keywords

${}^{12}C$ (α,γ $)^{16}$ O cross sections at stellar energies