\({^{147,149}{\textrm{Sm}}}\) are slow neutron capture (s-process) nuclides in nuclear astrophysics, whose (n, \(\gamma\) ) cross sections are important input parameters in nucleosynthesis network calculations in the samarium (Sm) region. In addition, \({^{149}{\textrm{Sm}}}\) is a fission product of \({^{235}{\textrm{U}}}\) with a 1% yield, and its neutron resonance parameters play a critical role in reactor neutronics. According to the available nuclear evaluation databases, a significant disagreement has been observed in the resonance peaks of the \({^{147,149}{\textrm{Sm}}}\) (n, \(\gamma\) ) cross-sectional data within the energy range of 20–300 eV. In this study, tutron capture cross section of a natural samarium target was measured at the back-streaming white neutron beamline of the China Spallation Neutron Source. The neutron capture yield was obtained, and the neutron resonance parameters for \({^{147}{\textrm{Sm}}}\) at 107.0, 139.4, 241.7, and 257.3 eV and \({^{149}{\textrm{Sm}}}\) at 23.2, 24.6, 26.1, 28.0, 51.5, 75.2, 90.9, 125.3, and 248.4 eV were extracted using the SAMMY code based on R-matrix theory. For the parameters \(\Gamma _{\textrm{n}}\) and \(\Gamma _{{\gamma }}\) in these energies of \({^{147,149}{\textrm{Sm}}}\) , the percentages consistent with the results of the CENDL-3.2, ENDF/B-VIII.0, JEFF-3.3, JENDL-4.0, and BROND-3.1 database are 27%, 65%, 65%, 42%, and 58%, respectively. However, 27% of the results were inconsistent with those of the major libraries. This work enriches experimental data of the \({^{147,149}{\textrm{Sm}}}\) neutron capture resonance and helps clarify the differences between different evaluation databases at the above energies.
