Electromagnetic Processes in
Abstract
Nuclear electromagnetic currents derived in a chiral-effective-field-theory framework including explicit nucleons, isobars, and pions up to N2LO, i.e. ignoring loop corrections, are used in a study of neutron radiative captures on protons and deuterons at thermal energies, and of A=2 and 3 nuclei magnetic moments. With the strengths of the -excitation currents determined to reproduce the n-p cross section and isovector combination of the trinucleon magnetic moments, we find that the cross section and photon circular polarization parameter, measured respectively in n-d and n-d processes, are significantly underpredicted by theory.
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