Shape-Phase and Order-To Transitions in Nuclei

Nuclear dynamics is investigated in shape-transitional regions of the Interacting Boson Model - version 2 (IBM-2). Strong suppression of chaotic behavior is found even far from the dynamical symmetry limits, thus confirming the role played by partial dynamical symmetries and suggesting that also possible symmetries at the critical point may contribute to the persistence of regular motion in transitional nuclei.