*3.1. Coulomb Multipole Interaction: VCM*

This multipole term accounts for the contribution of the two-body Coulomb interaction to the MED. The contribution to the MED or TED arises due to protons re-coupling angular momentum, with the resulting change in Coulomb energy, and the different numbers of active *pp* pairs between the isospin-symmetric configurations of the isobaric analogue states. It is accounted for in the shell-model simply through the application of Coulomb matrix elements, calculated in a HO basis.
