A study of the fine-structure constant dependence of radiative capture in Halo-EFT

Abstract

We study the fine-structure constant dependence of the rates of some selected radiative capture reactions within the framework of so-called Halo Effective Field Theory in order to assess the adequacy of some assumptions made on the Coulomb penetrability. We find that this dependence deviates from that implied by a parameterization of the cross sections of this effect via a simple penetration factor. Some features of this fine-structure dependence are discussed, in particular its potential impact on the abundances of the light elements in primordial nucleosynthesis.

17 pages, 14 figures, references updated

References in corpus (5)

• Astrophysical S-factor of the 3He(alpha,gamma)7Be reaction measured at low energy via prompt and delayed gamma detection
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• 3He(alpha,gamma)7Be cross section at low energies
• The 3He + 4He --> 7Be Astrophysical S-factor
• Alpha-alpha scattering in the Multiverse