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

TL;DR

This paper explores how triaxial deformation within a two-fluid SU(3) symmetry framework explains the observed B(E2) anomalies and specific energy ratios in nuclear structure, linking experimental observations to symmetry principles.

Contribution

It demonstrates that the B(E2) anomaly and related energy ratios can be understood through triaxial SU(3) symmetry and band-mixing effects in a proton-neutron boson model.

Findings

B(E2;4_1^+ ightarrow2_1^+)/B(E2;2_1^+ ightarrow0_1^+) < 1.0

E(4_1^+)/E(2_1^+) > 2.0

Anomalous E2 transitions explained by triaxial 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 $B(E2;4_1^+\rightarrow2_1^+)/B(E2;2_1^+\rightarrow0_1^+)<1.0$ 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.