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Nuclear Physics A 808 (2008) 27-46
Triaxiality in the interacting boson model
B. Sorgunlu1, 2, P. Van Isacker1

The signature splitting of the $\gamma$-vibrational band of several Ru, Pd, Xe, Ba, Os and Pt isotopes is analyzed in the framework of the interacting boson model (IBM). The nuclei studied are close to the $\gamma$-unstable SO(6) limit of the IBM and have well-known $\gamma$ bands. It is shown that in most nuclei the signature splitting is better reproduced by the inclusion of a three-body interaction between the $d$ bosons. In none of the nuclei evidence for a stable, triaxial ground-state shape is found.
1 :  GANIL - Grand Accélérateur National d'Ions Lourds
2 :  Department of Physics
Physique/Physique Nucléaire Théorique
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