Abstract
A model of coupled rotational bands, including three types of phonons, β, γ and S( K π = 1 + or 0 +), is proposed and applied to a number of even-even rare earth back-bending nuclei. It reproduces the most complicated experimentally known multiple-band crossings in 154Gd, 156Dy, 164Er and the clockwise circling of the yrast B(E2) values (versus ω 2) in back-bending nuclei. The direct coupling strengths, derived from a fit to experimental data, are discussed in detail.
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