Mixed Symmetry States in Even—Even ^96—108Mo Nuclei

Excitation energies and electromagnetic transition strengths in even-even ^96-108Mo nuclei have been described systematically be using the proton-neutron interacting boson model (IBM-2).It appears that the properties of low-lying levels in these isotopes,for which the comparison between experiment and theory is possible,can be satisfactorily described by the IBM-2 model,provided proper account is taken of the presence at low energy of states having a mixed-symmetry character.It seems possible to identify,in each isotope,a few states having such a character,the lowest ones being either 22^ or 23^ levels.It is found that these nuclei are in the transition from U(5) to SU(3).

Mixed Symmetry States in Even-Even 96-108Mo Nuclei

Excitation energies and clcctromagnetic transition strengths in even-even 96-108Mo muclei have been dcscribed systcmatically by using the proton-neutron interacting boson model (IBM-2). It appears that the properties oflow-lying levels in these isotopes, for which the comparison between experimcnt and theory is possible, can be satisfac-torily described by the IBM-2 model, provided proper account is taken of the presence at low energy of statcs having amixed-symmetry character. It seems possible to identify, in each isotope, a few states having such a character, the lowestones being either 2+2 or 2+3 levels. It is found that these nuclei are in the transition from U(5) to SU(3).