\begin{document}$ \sigma_{\rm t} $\end{document}) of 169Tm is of considerable importance in the design of nuclear reactors and applications of nuclear technology. However, the \begin{document}$ \sigma_{\rm t} $\end{document} of 169Tm is unavailable in the 5 keV to 2.3 MeV energy range in the Experimental Nuclear Reaction Data library and exhibits significant discrepancies among different Evaluated Nuclear Data libraries in the keV region. To clarify the discrepancies in the \begin{document}$ \sigma_{\rm t} $\end{document} of 169Tm in the keV energy region, we developed a new measurement strategy using the transmission method and the time-of-flight technique and employed it at the back-streaming white neutron beamline of the China Spallation Neutron Source. The experimental background was quantitatively determined using the saturated resonance absorption technique with a 7Li-glass scintillator. The \begin{document}$ \sigma_{\rm t} $\end{document} of 169Tm in the 1−110 keV energy range was obtained, and the value showed good agreement with the evaluated data in the JENDL-5 library. The calculations of the optical model agree well with the results and the fine-tuned optical model parameters in TALYS validated against the 2.3–2.5 MeV data reported by Foster and Glasgow, with deviations below 5%. The results fill the experimental gap in the 5–110 keV range and thus provide valuable input for research on nuclear reactions and evaluations of nuclear data."> Measurement of the neutron total cross section of <sup>169</sup>Tm in the energy range of 1−110 keV and recommendation of optical model parameters -
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