Low-Energy Direct Capture in the 16O(alpha,gamma)20Ne Reaction

Details Low-Energy Direct Capture in the 16O(alpha,gamma)20Ne Reaction Low-Energy Direct Capture in the 16O(alpha,gamma)20Ne Reaction

2005-07-28

arxiv.org/abs/astro-ph/0507672v1

Phys.Rev. C72 (2005) 035803

Astronomy and Astrophysics

Astrophysics

11 pages, 4 figures, Phys. Rev. C, accepted for publication

Scientific paper

10.1103/PhysRevC.72.035803

The cross section of the 16O(a,g)20Ne capture reaction is analyzed at low energies where the direct capture mechanism is dominant. For temperatures below T9 = 0.2 the resulting astrophysical reaction rate is about a factor of two higher than in a recent compilation whereas the energy dependence of the astrophysical S-factor and the branching ratios to the 20Ne bound states are very similar to previous calculations. The validity of the widely used detailed balance theorem for the inverse 20Ne(g,a)16O photodisintegration rate is confirmed for the special case of high-lying first excited states.

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