Collinear laser spectroscopy for the study of exotic nuclei at ISOLDE-CERN.

This project aims to study the evolution of nuclear single particle orbits and its effect on changes in the shell structure in a few particular regions of the nuclear chart, far from the valley of stability, where predictions of the nuclear properties are not possible using current‐day nuclear theories or based on ‘systematic behavior’. The model‐independent determination of the nuclear spin of an isotopes ground state or a long‐lived isomeric state, forms a starting point for assigning spins and parities to the lowenergy levels in nuclei. To get information on the nuclear parity and its wave function, we measure the nuclear magnetic moment, while the nuclear quadrupole moment and mean square charge radius provide information on the possible deformation, core polarization and interplay between collective and single particle degrees of freedom in atomic nuclei. We use the method of high‐resolution collinear laser spectroscopy, in different configurations and using different detection methods to observe the atomic (or ionic) hyperfine structure, from which the spin, moments and radii are deduced in a model‐independent way. Two experimental beam lines are used and continuously upgraded at ISOLDE‐CERN: COLLAPS and CRIS, maintained and operated both in international collaborations. The regions we aim to investigate in this proposal are

- The neutron‐rich region between 48Ca and 78Ni (and just above it).

- The region around the magic Sn isotopes, both towards doubly‐magic 100Sn as well as towards 132Sn.

- The neutron‐deficient trans‐lead region.