The phase diagram of models with configuration mixing is investigated in mean-field approximation. The configurations correspond to different limits of a dynamical algebra U($n$), such as U($n-1$) and SO($n$), and are allowed to mix. It is shown that this diagram has unusual properties not present in models with a single configuration. Applications to nuclear and molecular physics are discussed.

• Received 27 April 2005

DOI:https://doi.org/10.1103/PhysRevC.73.061302