\begin{document}$\gamma$\end{document} transition-intensities from the initial capture state to low-lying states may represent the model-independent \begin{document}$\gamma$\end{document}-strength function, which reflects the effects of different neutron-capture reaction mechanisms. The extraordinary quenching of the \begin{document}$\gamma_{0}$\end{document} transition from the p-wave neutron radiative capture in \begin{document}$^{57}$\end{document}Fe is observed, for the first time, from the pronounced enhancement of the \begin{document}$\gamma$\end{document}-strength function ratios \begin{document}$f_{\gamma_{1}}/f_{\gamma_{0}}$\end{document} and \begin{document}$f_{\gamma_{2}}/f_{\gamma_{0}}$\end{document}. The 2p-1h doorway excitation leads to suppression of the \begin{document}$\gamma_{0}$\end{document} transition to the ground state and the enhancement of the \begin{document}$\gamma_{1}$\end{document} and \begin{document}$\gamma_{2}$\end{document} transitions to the first and second excited states, respectively. The \begin{document}$fp$\end{document} sub-shells supply the exact number of spaces required for the 2p-1h configuration, which features the neutron capture mechanism in the vicinity of A = 55."> Quenching of <inline-formula><tex-math id="M1-3">\begin{document}${ \gamma_{0}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/54cba6f8-5560-45e0-8926-d656b0cb5943/CPC-2020-0255_M1-3.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/54cba6f8-5560-45e0-8926-d656b0cb5943/CPC-2020-0255_M1-3.png"/></alternatives></inline-formula> transition results from 2<i>p</i>-1<i>h</i> doorway mechanism by <i>p</i>-wave neutron excitation -
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