Giant resonances in the radiative capture of ³He by ³H

The shape of the photon angular distribution and the broad maximum in the excitation function observed at E_He=20.8 MeV in the cross section for radiative capture of ³He by ³H to form the first excited state of ⁶Li are explained in terms of the interference of three very wide ³³F_J overlapping resonances. The differential cross section, the total cross section and the photon angular distribution have been analysed in terms of a resonant formalism derived from an expansion in resonances and Gamow states of the transition amplitude for direct radiative capture. Numerical values of the resonance energies, total, elastic and radiative widths are given.