\begin{document}$ N=184$\end{document}, implying that \begin{document}$ N=184$\end{document} may be the magic number of the superheavy nucleus region. The α decay half-lives of known superheavy nuclei are calculated using the Generalized Liquid Drop Model (GLDM) and Royer formula with the input of the optimized α decay energies obtained using the FRDM-NN, and the calculations can reproduce the experimental data well. The α decay half-lives of unknown superheavy nuclei, in particular, superheavy nuclei with \begin{document}$ Z=119$\end{document} and 120, are also predicted using the GLDM and Royer formula with the input of the α decay energy obtained using the FRDM-NN. The relative error of two types of predicted α decay half-lives and superposition are analyzed, and the average predictions are given. The α decay energies predicted by the FRDM-NN and the α decay half-lives calculated using the GLDM and Royer formula can provide references for the experimental synthesis of new superheavy elements with \begin{document}$Z=119$\end{document} and 120."> <i>α</i> decay properties of superheavy nuclei based on optimized <i>α</i> decay energies -
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