Abstract
The recent accurate measurements of fusion cross sections at subbarrier energies have enabled extraction of barrier distributions which could provide a novel test for collective models. We carry out a systematic study of subbarrier fusion in rare-earth nuclei using a scheme which incorporates the interacting boson model for nuclear structure effects. The existing data on vibrational and rotational nuclei are fitted with a consistent set of parameters which are then used to predict the fusion cross sections and distribution of barriers in transitional nuclei. Contrary to vibrational and rotational nuclei where the cross sections increase smoothly with increasing deformation or mass number, transitional nuclei exhibit sharp changes in the barrier distribution due to shape-phase transitions. An accurate measurement of fusion cross sections for Pt and Os nuclei could thus provide a sensitive test for competing models in this region.
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