Mesonic exchange currents and radiative thermal neutron capture by the deuteron

Radiative capture of thermal neutrons by the deuteron: $\mathrm{n}+\mathrm{d}\to {}_{}{}^3{}_{}{}^{}\mathrm{H}+\gamma$ is investigated. Wave functions built upon definite nucleon-nucleon forces are used to describe both the bound state and the scattering two-body state. The role of mesonic exchange currents and of two-nucleon forces are investigated in detail. Finally, the bearing of genuine three-nucleon forces on the cross sections and other related properties is exhibited.