\begin{document}$ ^{18} {\rm{O}}$\end{document} + \begin{document}$ ^{50} {\rm{Cr}}$\end{document}, the fusion excitation functions were measured for the \begin{document}$ ^{16,18} {\rm{O}}$\end{document} + \begin{document}$ ^{50} {\rm{Cr}}$\end{document} systems at energies near and below the Coulomb barriers by using the electrostatic deflector setup. \begin{document}$ ^{16} {\rm{O}}$\end{document} + \begin{document}$ ^{50} {\rm{Cr}}$\end{document} was selected as a reference system. The coupling effect of the low-lying collective excitation states in sub-barrier fusion was considered based on coupled-channels calculations. For \begin{document}$ ^{18} {\rm{O}}$\end{document} + \begin{document}$ ^{50} {\rm{Cr}}$\end{document}, the calculated fusion cross-sections of coupled channels, including the lowest 2\begin{document}$ ^+ $\end{document}vibrational states of the target nucleus and projectile, give subtle under-estimation for the experimental ones at energies below the Coulomb barrier. This means that there is limited room for the transfer effect in\begin{document}$ ^{18} {\rm{O}}$\end{document} + \begin{document}$ ^{50} {\rm{Cr}}$\end{document}, compared to the widely accepted argument of positive Q-value 2n-transfer remarkably enhancing the sub-barrier fusion cross-sections. Analogous systems of neutron-rich \begin{document}$ ^{18} {\rm{O}}$\end{document}-induced fusion in existing literature show the same peculiarity that the positive Q-value two-neutron stripping channel has no remarkable influence on enhancing sub-barrier fusion cross-sections."> Near-barrier fusion of <sup>16,18</sup>O + <sup>50</sup>Cr: the role of positive <i>Q</i>-value two-neutron stripping channel -
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