Speaker
Description
When modelling excited states of deformed nuclei, nucleons can be taken collectively as a rotor, significantly simplifying the system. However, in order to take into account single-particle effects it is important to properly model the valence nucleons, especially those occupying large angular momenta orbitals near the Fermi level. For that purpose a model has been developed in which two valence nucleons of the same kind are coupled to an axially symmetric quadrupole deformed rotor of the D$_2$ symmetry. These identical valence nucleons form a pair, with the pair-coupling strength controlled by the the nuclear delta force, a pairing contact force. In this two-particle-rotor model a Coriolis force emerges resulting in the breaking of the pair formed by the valence nucleons. With this, both single particle and collective degrees of freedom are encapsulated in the model and compared to the yrast line of $^{178}$Hf and $^{162}$Er. This model may be extended to triaxial symmetries encompassing a broader range of quadrupole deformed nuclei.
