C-12(alpha, gamma)O-16 cross sections at stellar energies

Details C-12(alpha, gamma)O-16 cross sections at stellar energies C-12(alpha, gamma)O-16 cross sections at stellar energies

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phrvl..69.1896o&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 69, no. 13, p. 1896-1899.

Astronomy and Astrophysics

Astrophysics

36

Angular Distribution, Carbon 12, Gamma Rays, Massive Stars, Nuclear Reactions, Electric Dipoles, Ground State, Quadrupoles, Resonance

Scientific paper

The excitation function of the C-12(alpha, gamma)O-16 reaction and the angular distribution of its gamma 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 + 6 or -1 keVb for the S factor at E(c.m.) = 0.3 MeV. The contribution of E2 transitions at the same energy is 40 +/- 7 keVb from a cluster-model analysis of the present data.

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