\begin{document}$ A=54 $\end{document}, \begin{document}$ T=3 $\end{document} isospin multiplet yields a surprisingly large d coefficient of IMME, i.e., \begin{document}$ d=18.6(27) $\end{document}, being \begin{document}$ 6.9\sigma $\end{document} deviated from zero, and the resultant \begin{document}$ |b/c| $\end{document} ratio significantly deviates from the systematics. This phenomenon is analyzed in this study, and we conclude that the breakdown of the quadratic form of IMME could be likely due to the mis-assignment of the \begin{document}$ T=3 $\end{document} isobaric analog state (IAS) in the \begin{document}$ T_z=1 $\end{document} nucleus 54Fe or extremely strong isospin mixing."> On the masses of <i>A</i> = 54 isospin septet and the isobaric multiplet mass equation -
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