Anharmonic double-phonon excitations in the interacting boson model
J. E. Garcia-Ramos, J. M Arias, P. Van Isacker
Abstract
Double-γ vibrations in deformed nuclei are analyzed in the context of the interacting boson model. A simple extension of the original version of the model towards higher-order interactions is required to explain the observed anharmonicities of nuclear vibrations. The influence of three- and four-body interactions on the moments of inertia of ground- and γ-bands, and on the relative position of single-γ and double-γ bands is studied in detail. As an example of a realistic calculation, spectra and transitions of the highly γ-anharmonic nuclei 164Dy, 166Er, and 168Er are interpreted in this approach.
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