\begin{document}$ Z=82 $\end{document} and \begin{document}$ N=126 $\end{document} shell closures. The α-cluster preformation probability is then found to behave in a GN-like pattern. This previously ignored point is explicitly demonstrated as the product of an interplay between the mean-field and pairing effect, which in turn reveals the structural influence on the formation of the α cluster in a simple and clear manner. In addition to providing an effective method to evaluate the amount of surface α clustering in heavy nuclei, the present conjecture supports other theoretical treatments of the α preformation probability."> New look at Geiger-Nuttall law and <i>α</i> clustering of heavy nuclei -
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