\begin{document}$ ^{206} {\rm{Rn}}$\end{document} have been examined via the \begin{document}$ ^{197} {\rm{Au}}$\end{document}(\begin{document}$ ^{14} {\rm{N}}$\end{document}, 5n)\begin{document}$ ^{206} {\rm{Rn}}$\end{document} fusion reaction at a beam energy of 78 MeV. A number of transitions and levels are identified by the γ-γ coincidence measurement, further enriching the level scheme of \begin{document}$ ^{206} {\rm{Rn}}$\end{document}. The full configuration shell model and nucleon-pair approximation (NPA) were utilized to investigate the single-particle configurations and seniority structures in \begin{document}$ ^{206} {\rm{Rn}}$\end{document}. The results of these two calculations suggest that \begin{document}$ 2_1^{+} $\end{document} and \begin{document}$ 4_1^{+} $\end{document} states exhibit only a 50% component of a seniority-two state associated with a broken neutron pair. The collectivity of these two states primarily arises from configuration mixing due to residual proton-neutron interactions. Furthermore, \begin{document}$ 6_1^{+} $\end{document} and \begin{document}$ 8_1^{+} $\end{document} states are predominantly characterized by a seniority-two state marked by a broken proton pair."> Investigating the level structure of <sup>206</sup>Rn: evolution from seniority regime to collective dynamics -
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