Within a transport model, we investigated the effects of the momentum dependence of the nuclear symmetry potential on the pion observables in central Sn + Sn collisions at 270 MeV/nucleon. To this end, the quantity Usym∞(ρ0)\documentclass[12pt]{minimal}
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\begin{document}$$U_\text {sym}^{\infty }(\rho _{0})$$\end{document} (i.e., the value of the nuclear symmetry potential at the saturation density ρ0\documentclass[12pt]{minimal}
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\begin{document}$$\rho _{0}$$\end{document} and infinitely large nucleon momentum) was used to characterize the momentum dependence of the nuclear symmetry potential. With a certain L (i.e., the slope of the nuclear symmetry energy at ρ0\documentclass[12pt]{minimal}
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\begin{document}$$\rho _{0}$$\end{document}), the characteristic parameter Usym∞(ρ0)\documentclass[12pt]{minimal}
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\begin{document}$$U_\text {sym}^{\infty }(\rho _{0})$$\end{document} of the symmetry potential significantly affects the production of π-\documentclass[12pt]{minimal}
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\begin{document}$$\pi ^{-}$$\end{document} and π+\documentclass[12pt]{minimal}
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\begin{document}$$\pi ^{+}$$\end{document} and their pion ratios. Moreover, by comparing the charged pion yields, pion ratios, and spectral pion ratios of the theoretical simulations for the reactions 108\documentclass[12pt]{minimal}
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\begin{document}$$^{108}$$\end{document}Sn + 112\documentclass[12pt]{minimal}
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\begin{document}$$^{112}$$\end{document}Sn and 132\documentclass[12pt]{minimal}
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\begin{document}$$^{132}$$\end{document}Sn + 124\documentclass[12pt]{minimal}
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\begin{document}$$^{124}$$\end{document}Sn with the corresponding data in the Sπ\documentclass[12pt]{minimal}
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\begin{document}$$\pi $$\end{document}RIT experiments, we found that our results favor a constraint on Usym∞(ρ0)\documentclass[12pt]{minimal}
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\begin{document}$$U_\text {sym}^{\infty }(\rho _{0})$$\end{document} (i.e., -160-9+18\documentclass[12pt]{minimal}
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\begin{document}$$-160^{+18}_{-9}$$\end{document} MeV), and L is also suggested within a range of 62.7 MeV<L<93.1\documentclass[12pt]{minimal}
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\begin{document}$$<L<93.1$$\end{document} MeV. In addition, the pion observable for 197\documentclass[12pt]{minimal}
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\begin{document}$$^{197}$$\end{document}Au + 197\documentclass[12pt]{minimal}
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\begin{document}$$^{197}$$\end{document}Au collisions at 400 MeV/nucleon also supports the extracted value for Usym∞(ρ0)\documentclass[12pt]{minimal}
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\begin{document}$$U_\text {sym}^{\infty }(\rho _{0})$$\end{document}.
