We investigate the properties of the excited spectra of the even-even isotopes of krypton using a Generalised Bohr Hamiltonian with three different Skyrme functionals. In particular, we investigate the evolution of the low-lying $2^{ +}_{ 1}$ and $4^{ +}_{ 1}$ states and their associated electromagnetic transitions. The model reproduces quite nicely the energy trends apart from ${ }^{ 88}$Kr, where none of the interactions used here are able to grasp a sudden change in the energy spectrum. Additionally, we explore the neutron deficient region ${ }^{ 72-76}$Kr which is a proposed region for shape coexistence. We observe that the model can reproduce the structure of the experimental spectrum of ${ }^{ 72}$Kr exceedingly well.
Categories: nucl-th