Anomalous low-energy $E2$-related behavior in triaxial nuclei

Abstract

The anomalous low-energy $E2$-related behavior of a triaxially-deformed nucleus bas been identified and analyzed based on the SU(3) algebraic theory within the framework of the interacting boson model. The results show striking features that include a $B(E2;4_1^{+}\to 2_1^{+})/B(2_1^{+}\to 0_1^{+})<1.0$ transition rate ratio and a $E(4_1^{+})/E(2_1^{+})>2.0$ 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 $\gamma$-deformation. This description is shown to be able to explain observed $E2$ anomalous phenomenon in neutron-deficient nuclei such as ${}^{172}$Pt and ${}^{168}$Os, and in so doing yields a deeper understanding of the physical features of a soft triaxially-deformed nucleus.

References in corpus (1)

• Emergent Sp(3,R) dynamical symmetry in the nuclear many-body system from an ab initio description

Cited by in corpus (9)

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• The IBM Description of the B(E2) Anomaly: Dynamical Triaxiality and Configuration Mixing
• B(E2) anomaly and triaxial deformation within a two-fluid SU(3) symmetry
• Partial conservation of seniority in semi-magic nuclei
• Algebraic description of the triaxially to axially rotational shape phase transition
• Probing Quadruple Deformation in Transitional Nuclei via Angular Momentum Projection