| Irfu-09-72
|
|---|
| The role of triaxiality for the coexistence and evolution of shapes in light krypton isotopes |
| M. Girod, J.-P. Delaroche, A. Görgen, A. Obertelli |
| The structure of low-lying states in the light krypton isotopes $^{72}$Kr, $^{74}$Kr, and
$^{76}$Kr has been studied with the finite-range Gogny D1S effective interaction via Hartree-Fock-Bogolyubov based calculations within a configuration-mixing formalism treating axial and triaxial quadrupole deformations. The good overall agreement with the experimental low-lying excitation spectra and matrix elements supports the shape coexistence scenario and a transition of the ground-state shape from oblate in
$^{72}$Kr to prolate in $^{76}$Kr. The triaxial degree of freedom is shown to be crucial to reproduce the experimental data in general and the inversion of the oblate and prolate configurations in particular. |
