Abstract
The energy levels of g.s. bands, ..beta.. bands, and ..gamma.. bands of /sup 154-162/Dy isotopes are studied in the model of the traditional interacting boson approximation, allowing one boson to break and form a quasiparticle pair. The two quasiparticles are allowed to excite to the i/sub 13/2/ and h/sub 11/2/ orbitals. It was found that the energy levels of the g.s., ..beta.., and ..gamma.. bands of even-even Dy nuclei can be reproduced very well. The backbends of the moment of inertia can also be reasonably described. The yrast B(E2) values are also calculated and compared with the experimental data.
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