Revista mexicana de física
Print version ISSN 0035-001X
An overview of the concept of quadrupole shape invariants is given. Definitions and ways to derive shape invariants from data that were found in recent works are summarized, and the connection and sensitivity of shape invariants to the nuclear shape/phase transition is shown. First results of an ongoing survey of shape invariants for excited states are presented, investigating the critical point behavior as a function of angular momentum and energy. A manifestation of theoretical predictions appears to be found in the transitional Gd isotopes.
Keywords : Electromagnetic transitions; collective levels; collective models.