Abstract
In the continuum shell model, the width of the 3/2-, 3/2 resonance state at 15.1 MeV in the mirror nuclei 13C and 13N is calculated. If channel coupling and the Pauli principle are taken into account, the width calculated without external mixing and without isotensor components is of the correct order of magnitude. The calculations show that coupling to isospin-allowed channels which are closed plays an important role.