Semimicroscopic description of odd At isotopes

The properties of odd At isotopes have been described by coupling three valence-shell protons to the quadrupole vibrational field. Qualitative and quantitative results have been compared with recent experimental data from the Dubna and Stockholm groups. It is interesting to note that two lowest $\frac{7}{2^{-}}$ states exchange their character in At nuclei away from the $N=126\mathrm{}$ shell closure. This pronounced feature of At isotopes is a combined effect of the particle-vibration coupling and the Pauli principle.