Coulomb energies in ${}^{18}\mathrm{Ne}$

We compute Coulomb energies for positive-parity levels in the mirror nuclei ${}^{18}\mathrm{O}$ and ${}^{18}\mathrm{Ne}$. The dependence on the configuration and binding energy is explicitly taken into account, using wave functions containing two-particle– and four-particle–two-hole components. Predictions are made for $2_3^{+},$ $3_1^{+},$ and $4_2^{+}$ states.