Abstract The thermal neutron capture cross sections of 55Mn (n,γ)56Mn reaction were measured for the first time at 0.0334 eV and 0.0536 eV energies by using a monochromatic neutron beam from TRIGA MARK-II research reactor. Neutron fluxes during the experiments were measured by using 197Au (n,γ)198Au monitor reaction. After considering all the correction factors such as neutron self-shielding and gamma-ray attenuation effects, the cross sections obtained at 0.0334 eV and 0.0536 eV are 11.07 ± 0.64 b and 9.03 ± 0.52 b, respectively. Our experimental data at 0.0334 eV and 0.0536 eV are 4.3% and 1.0% lower than the theoretical evaluated data of ENDF/B-VIII.0 and JENDL-4.0 data libraries, respectively. By following 1/v dependence in the thermal energy region, the resultant cross section values extrapolated to the average thermal neutron energy 0.0253 eV were calculated and compared with reported literature values. Our experimental data for this reaction would be helpful to ensure the reliability of the cross sectional data evaluated by 1/v relation in the nuclear data libraries.

中文翻译：

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中子能量为 0.0334 eV 和 0.0536 eV 时 55Mn(n,γ)56Mn 反应的实验截面

摘要 利用TRIGA MARK-II研究堆的单色中子束，首次在0.0334 eV和0.0536 eV能量下测量了55Mn (n,γ)56Mn反应的热中子俘获截面。实验过程中的中子通量通过使用 197Au (n,γ)198Au 监测反应进行测量。在考虑中子自屏蔽和伽马射线衰减效应等所有校正因素后，在0.0334 eV和0.0536 eV处得到的截面分别为11.07±0.64 b和9.03±0.52 b。我们在 0.0334 eV 和 0.0536 eV 下的实验数据分别比 ENDF/B-VIII.0 和 JENDL-4.0 数据库的理论评估数据低 4.3% 和 1.0%。通过遵循热能区域中的 1/v 依赖性，所得横截面值外推到平均热中子能 0。计算了 0253 eV 并与报道的文献值进行了比较。我们对该反应的实验数据将有助于确保核数据库中通过 1/v 关系评估的横截面数据的可靠性。