The Coulomb shift in the mirror systems of α +14C in 18O and α+14O in 18Ne is investigated by applying the orthogonality condition model (OCM). The result of OCM predicts the reduction of the excitation energies of the higher O+ states in the proton-rich nucleus of 18Ne in comparison to the energies in the neutron-rich 18O nucleus. This reduced excitation energy is similar to the phenomenon known as the Thomas-Ehrman shift, which means the lower shift in the excitation energy of the s-wave single particle orbit around the 16O core.
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