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 $B(E2;4_1<sup>+\rightarrow2_1<sup>+)/B(E2;2_1<sup>+\rightarrow0_1<sup>+)&lt;1.0$ along with $E(4_1<sup>+)/E(2_1<sup>+)&gt;2.0$, 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.