Relation between the 16O(alpha,gamma)20Ne reaction and its reverse 20Ne(gamma,alpha)16O reaction in stars and in the laboratory

Abstract

The astrophysical reaction rates of the 16O(a,g)20Ne capture reaction and its inverse 20Ne(g,a)16O photodisintegration reaction are given by the sum of several narrow resonances and a small direct capture contribution at low temperatures. Although the thermal population of low lying excited states in 16O and 20Ne is extremely small, the first excited state in 20Ne plays a non-negligible role for the photodisintegration rate. Consequences for experiments with so-called quasi-thermal photon energy distributions are discussed.

4 pages, 2 figures, Proceedings Nuclear Physics in Astrophysics-II, Debrecen, Hungary, 2005

References in corpus (3)

• Systematic study of (g,n) reaction rates for Z>=78 isotopes
• Low-Energy Direct Capture in the 16O(alpha,gamma)20Ne Reaction
• Photon-induced Reactions in Stars and in the Laboratory: A Critical Comparison

Cited by in corpus (7)

• Frontiers in Nuclear Astrophysics
• Elastic alpha scattering experiments and the alpha-nucleus optical potential at low energies
• Survival of Nature's Rarest Isotope 180Ta under Stellar Conditions
• Photon-induced Nucleosynthesis: Current Problems and Experimental Approaches
• Properties of the 5- state at 839 keV in 176Lu and the s-process branching at A = 176
• $\alpha$-cluster states in ${}^{46,54}$Cr from double-folding potentials
• Modification of nuclear transitions in stellar plasma by electronic processes: K-isomers in 176Lu and 180Ta under s-process conditions