Coulomb shift in mirror cluster systems.

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. [ABSTRACT FROM AUTHOR]