Abstract
We describe radiative-capture reactions at low energies within the nuclear coupled-channel approach denoted MCAS (multi-channel algebraic scattering). The amplitude of single-photon emission is constructed via a generalization of the Siegert theorem in an explicit gauge-independent way, without any multipole decomposition of the electromagnetic (e.m.) current operator. As a first test application, we calculate the 3He(α, γ)7Be reaction cross section at astrophysical energies using a simplified two-cluster model. The energy dependence of the calculated astrophysical factor reproduces the experimental situation fairly well, though the cross-section normalization turns out to be overestimated.
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