Bayesian analysis of capture reactions 3He(α,γ)7Be and 3H(α,γ)7Li
Abstract
Bayesian analysis of the radiative capture reactions 3He(α,γ)7Be and 3H(α,γ)7Li are performed to draw inferences about the cross sections at threshold. We do a model comparison of two competing effective field theory power countings for the capture reactions. The two power countings differ in the contribution of two-body electromagnetic currents. In one power counting, two-body currents contribute at leading order, and in the other they contribute at higher orders. The former is favored for 3He(α,γ)7Be if elastic scattering data in the incoming channel is considered in the analysis. Without constraints from elastic scattering data, both the power countings are equally favored. For 3H(α,γ)7Li, the first power counting with two-body current contributions at leading order is favored with or without constraints from elastic scattering data.
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