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The exotic structures in the 2s_{1/2} states of five pairs of mirror nuclei^{17}O-^{17}F, ^{26}Na-^{26}P, ^{27}Mg-^{27}P, ^{28}Al-^{28}P and^{29}Si-^{29}P are investigated with the relativistic mean-field (RMF) theoryand the single-particle model (SPM) to explore the role of the Coulomb effectson the proton halo formation. The present RMF calculations show that the exoticstructure of the valence proton is more obvious than that of the valenceneutron of its mirror nucleus, the difference of exotic size between eachmirror nuclei becomes smaller with the increase of mass number A of the mirrornuclei and the ratios of the valence proton and valence neutronroot-mean-square (RMS) radius to the matter radius in each pair of mirrornuclei all decrease linearly with the increase of A. In order to interpretthese results, we analyze two opposite effects of Coulomb interaction on theexotic structure formation with SPM and find that the contribution of theenergy level shift is more important than that of the Coulomb barrier for lightnuclei. However, the hindrance of the Coulomb barrier becomes more obvious withthe increase of A. When A is larger than 34, Coulomb effects on the exoticstructure formation will almost become zero because its two effects counteractwith each other.

Coulomb effects on the formation of proton halo nuclei