New spectroscopic information on ^211,213Tl: A changing structure beyond the N=126 shell closure

The neutron-rich isotopes ^211,213Tl, beyond the N=126 shell closure, have been studied for the first time in isomer γ-ray decay, exploiting the fragmentation of a primary uranium beam at the Fragment Separator-Rare Isotopes Investigation at GSI setup. The observed isomeric states in ^211,213Tl show a deviation from the seniority-like scheme of ²⁰⁹Tl. The possible interpretation of the data is discussed on the basis of energy-level systematics and shell-model calculations.