B(E2) anomaly and triaxial deformation within a two-fluid SU(3) symmetry

Abstract

The correlation between $B(E2)$ structure and triaxial deformation has been investigated within the framework of the proton-neutron boson model. The analysis reveals that the distinctive feature, characterized by $B(E2;4_1^{+}\to 2_1^{+})/B(E2;2_1^{+}\to 0_1^{+})<1.0$ along with $E(4_1^{+})/E(2_1^{+})>2.0$, can emerge from the triaxial SU(3) symmetry inherent in two-fluid boson systems, attributed to band-mixing effects. This suggests a symmetry-based understanding of the anomalous $E2$ transitions observed in experiments.

6 pages, 3 figures

References in corpus (13)

• Microscopic Formulation of Interacting Boson Model for Rotational Nuclei
• Analytic predictions for nuclear shapes, the prolate dominance and the prolate-oblate shape transition in the proxy-SU(3) model
• Proxy-SU(3) symmetry in heavy deformed nuclei
• Phase structure of a two-fluid bosonic system
• Phase structure of the two-fluid proton-neutron system
• Phase Diagram of the Proton-Neutron Interacting Boson Model
• Triaxiality in the interacting boson model
• Anomalous low-energy $E2$-related behavior in triaxial nuclei
• SU(3) realization of the rigid asymmetric rotor within the IBM
• Triaxiality and the determination of the cubic shape parameter K3 from five observables
• Triaxial rotor modes in finite-N boson systems
• B(E2) anomaly and triaxial deformation in the interacting boson model
• Quadrupole and octupole states in ${}^{152}$Sm using the proton-neutron interacting boson model