Triaxial shapes in the interacting boson model

Abstract

We suggest the use of cubic terms in the interacting boson model. It is shown that, examining the classical limit, such cubic terms can give rise to stable, triaxial shapes. Energy spectra are studied in the U(5), O(6), and SU(3) limits. Also, a more realistic case is studied in $^{104}\mathrm{Ru}$.