Abstract
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 FRS-RISING (FRagment Separator-Rare ISotopes INvestigation at GSI) setup at GSI. 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.
Highlights
Doubly-magic nuclei constitute the cornerstones of our knowledge of nuclear structure
A spectroscopic study of thallium isotopes beyond N = 126 could shed some light and show whether a structure other than the seniority schemes of 210−216Pb is developing or not
The basic idea is that the proton hole in the Z = 82 shell closure couples to the seniority-isomer structure observed in 210Pb
Summary
Doubly-magic nuclei constitute the cornerstones of our knowledge of nuclear structure. Isotopes around shell closures exhibit excitations which have a single-particle nature sufficiently strong to be indicative of the shell-gap size and of the energies of shells above or below the doublymagic core. Given the limited number of nucleons outside an
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