\begin{document}$ \beta_2 $\end{document}, γ, \begin{document}$ \beta_4 $\end{document}), a systematic investigation of mirror-pair nuclei 74Kr-74Sr, 78Sr-78Zr, and 82Zr-82Mo has been carried out to predict the mirror symmetry violation in their rotational properties. The empirical P-factor, energy ratio \begin{document}$ R_{4/2} $\end{document}, the energies of the first excited state \begin{document}$ E_{2_1^+} $\end{document}, and the binding energies \begin{document}$ E_{\rm{bind}} $\end{document} of these mirror partner nuclei are displayed, together with the primary deformation \begin{document}$ \beta_2 $\end{document} and \begin{document}$ \beta_4 $\end{document}. Our calculations indicate that shape coexistence exists in the ground state of all these mirror partner nuclei. The moments of inertia of these mirror partner nuclei are not always the same in the yrast band. The rotational frequencies at which upbending occurs in 74Kr and 74Sr are nearly identical, whereas in 78Sr and 82Zr the upbending sets in earlier than in their mirror partners 78Zr and 82Mo. The upbending phenomenon in 74Kr and 74Sr is attributed to the simultaneous alignment of proton and neutron. Taking the nuclei 78Sr-78Zr as examples, we suggest the first upbending is attributed to the alignment of protons and neutrons within the \begin{document}$ 1g_{9/2} $\end{document} orbitals, as evidenced by the calculated single-particle energy levels. These specific band crossings are further elucidated through quasiparticle Routhian diagrams, which characterize the alignment of high-j, low-Ω pairs and reveal the underlying microscopic mechanism. Our results show that 74Kr and 74Sr maintain strong mirror symmetry in their rotational behavior, 78Sr and 82Zr exhibit earlier upbending than their mirrors, indicating possible mirror symmetry breaking. This study may provide new insights for future research into the mirror symmetry violation in the nuclear excited states."> On the Prediction of Mirror Symmetry Violation in Rotational Properties for <i>A</i> ≈ 80 Nuclei -
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