Abstract
We investigate the achievable degree of agreement between spectroscopic predictions of the geometric collective model (GCM) and the interacting boson model-1 (IBM-1). First, the GCM potential-energy surfaces are made locally equivalent with the IBM-1 semiclassical potentials close to the minimum. The GCM kinetic term is then optimized to reproduce some of the IBM-1 energy ratios. Differences between the spectra, as predicted by the two models, are discussed for the transitional region from the prolate axially symmetric rotor to the spherical vibrator.
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