A theoretical interpretation of the anomalous reduced E2 transition probabilities along the yrast line of neutron-deficient nuclei

Abstract

The anomalous low-energy E2-related behavior of a triaxially deformed nuclei is examined within the framework of the interacting boson model. The results show striking features that include a B(E2;41+→21+)/B(E2;21+→01+)<1.0 transition rate and a E(41+)/E(21+)>2.0 excitation energy ratio that can be tracked back to a finite-N effect, which in a large-N limit of the theory yields normal results for a stable γ-deformation. This description is shown to explain experimentally observed results in 172Pt and 168Os, and in doing so yields a deeper understanding of the physical features of a soft triaxially-deformed nucleus.

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