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A quantum-statistical analysis of the regular and chaotic dynamics of medium-mass even-even nuclei within the framework of the interacting boson model-2 (IBM-2) has been carried out. In particular, in the SUπ+ν(3)→Uπ+ν(5) transition a broad nearly regular region has been observed, while the SUπ+ν(3)*→Uπ+ν(5) one shows an unexpected completely regular behavior. These results confirm and extend the observations previously made by other authors in the frame of IBM-1, strengthening the hypothesis of the basic role played by the partial dynamical symmetries in preserving regular motion patterns even far from the usual dynamical limits of IBM-2. A new important feature of the SUπ+ν(3)* limit has also been found, confirming the importance of the SU(3) symmetry of IBM in studying nuclear-structure properties.
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