s-wave halo effect and the Coulomb barrier top effect on the mirror state of a halo - art. no. 034305

The Thomas-Ehrman shift for Be-11 and N-11 mirror nuclei, which was recentl y observed as a differential energy shift between s and other orbital state s, is investigated in terms of complex expectation values. In calculating t he complex expectation values, we use a new method which was recently propo sed within the framework of the complex scaling method. The physical origin of the energy shift can be understood by considering the effects of the s- wave halo and the Coulomb barrier top. These two effects are discussed as a nother proof of a halo in addition to the observation of large matter radii in the drip-line nuclei.