\begin{document}$B(E2;2_{1}^{+}\rightarrow0_{1}^{+})$\end{document} value of 7(4) W.u. in \begin{document}$^{166}{\rm{Os}}$\end{document} was found experimentally. This result is much smaller than the values of 74(13) W.u. and 97(9) W.u. in the adjacent nuclei \begin{document}$^{168,170}{\rm{Os}}$\end{document}. Using the newly proposed technique called "\begin{document}$ S U$\end{document}(3) analysis" and the new explanatory framework for the SU(3) anomaly, the \begin{document}$B(E2;2_{1}^{+}\rightarrow0_{1}^{+})$\end{document} anomaly in \begin{document}$^{166}{\rm{Os}}$\end{document} is studied for the first time. Four results are used to fit the experimental data in \begin{document}$^{166,168,170}{\rm{Os}}$\end{document} successfully. This implies that the level-crossing or level-anticrossing explanation is applicable."> <inline-formula><tex-math id="Z-20251224091608">\begin{document}$ {{\boldsymbol B}({\boldsymbol E}{\bf {2;2_{1}^{+}}}\rightarrow {\bf {0_{1}^{+})}}}$\end{document}</tex-math></inline-formula> anomaly in <sup>166</sup>Os -
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