\begin{document}$ {\rm^{214}U} $\end{document} has been produced at the Heavy Ion Research Facility in Lanzhou, China. The α-decay reduced width (\begin{document}$ \delta^{2} $\end{document}) of \begin{document}$ {\rm^{214}U} $\end{document} has been found to be significantly larger than those of other nuclei by a factor of 2. However, the extraction of \begin{document}$ \delta^{2} $\end{document} depends on the penetration probability (P) through the barrier, and P is related to the theoretical method of obtaining it and the form of the α-core potential. The aim of this study is to investigate whether the selections of the α-core potential and the method of calculating P can affect the above conclusion. Four different phenomenological α-core potentials and two microscopic double-folding potentials, together with the Wentzel-Kramers-Brillouin (WKB) approximation and transfer matrix (TM) approach, are used to obtain P. The value of P obtained using the WKB approximation is about 20%−40% smaller than the one obtained using the TM approach. Thus, the deduced \begin{document}$ \delta^{2} $\end{document} is overestimated. The choice of α-core potential can significantly affect the value of \begin{document}$ \delta^{2} $\end{document}. With the spherical form for the α-core potentials, the \begin{document}$ \delta^{2} $\end{document} of \begin{document}$ {\rm^{214}U} $\end{document} obtained with both the WKB and TM approaches are about twice as large as those of the surrounding nuclei. With the deformed double-folding potential, the ratio between \begin{document}$ \delta^{2} $\end{document} of \begin{document}$ {\rm^{214}U} $\end{document} and that of the surrounding nuclei is observed to be slightly below 2. The effects of nuclear deformation and the α-core potential should be considered when studying the α-decay reduced width in the \begin{document}$ N_{p}N_{n} $\end{document} systematics."> Revisiting the alpha-decay reduced width of the lightest uranium isotope <sup>214</sup>U -
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