Speaker
Volker Werner
Description
Recent work on the neutron-rich 148Ce showed that it marks the boundary of the N=90 shape-phase transitional region. However, a model analysis within the IBM shows its proximity to the QPT, however, involving the gamma-degree of freedom. This is brought into context with the evolution of trajectories in the symmetry space (Casten triangle) and the NpNn formalism, in which larger numbers of valence particles should invoke larger deformation and correspondingly evolving basic observables like E(2+) and B(E2)s. Seemingly, data on E(2+) energies in rare-earth isotopes are contradictory to this expected trend and - in view of newly emerged theoretical approaches to very deformed systems - motivate a new strain of experimental work.
Author
Volker Werner
