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中子全截面是最基础且重要的核数据之一，不仅是核反应理论研究的重要参数，也是共振参数提取和核数据库评价所必须的关键数据。然而，在低能共振区，由于实验本底复杂、样品自屏蔽效应和仪器展宽影响，不同实验的测量结果存在数据分歧。本工作是首次在中国散裂中子源反角白光中子束线（CSNS Back-n）开展 169Tm 的中子全截面测量。采用翼形锂玻璃探测器对 0.5 mm 和 4.5 mm 厚度样品进行了透射实验，并结合锂玻璃闪烁体与饱和共振吸收技术，定量评估并扣除了束内伽马本底，获得了 1–100 eV 能区的中子透射率和全截面数据，结果与已有实验数据库符合较好。结合任杰等人在 Back-n 获得的中子俘获实验数据，利用 SAMMY 程序对透射率进行了 R 矩阵拟合，提取了该能区的共振参数，初步验证了 I. Knapová 等人观测到的 8.037 eV 处的新共振峰。基于提取的参数，采用 Reich–Moore 近似重构了 169Tm 全截面，结果与 ENDF/B-VIII.1 共振参数重构的截面符合较好，为核数据库提供了新的参考。本文数据集可在（科学数据银行）https://www.doi.org/10.57760/Sciencedb.j00213.00192中访问获取 (审稿阶段请通过私有访问链接查看本文数据集https://www.scidb.cn/s/MrUVry) 。The neutron total cross section is one of the most fundamental nuclear data. In the low-energy resonance region, discrepancies among measurements are caused by experimental backgrounds, sample self-shielding, and instrumental broadening, complicating the precise determination of cross sections. In this work, the neutron total cross sections of 169Tm were measured at the Back-n facility of the China Spallation Neutron Source (CSNS). Wing-shaped lithium glass detectors were employed to record the transmitted neutron signals from samples with thicknesses of 0.5 mm and 4.5 mm. The raw data were processed, including time-of-flight correction and normalization to the incident proton number, to account for fluctuations in the proton beam intensity. The in-beam γ background was quantified using the saturated resonance absorption technique with glass scintillators. Following background subtraction, transmission and total cross-section data were obtained over the energy range of 1–100 eV. The measured spectra were analyzed using the SAMMY code within the framework of the R-matrix. Capture data from Ren et al. were incorporated to improve the reliability of the extracted resonance parameters. For the resonance near 8 eV, the Γγ was set to the library average value of 86 meV. The resonance energy was determined to be 8.037 eV, consistent with the recently reported resonance by I. Knapová et al., and the neutron widths for both total spin states were evaluated. Based on the extracted parameters, the neutron total cross section of 169Tm was reconstructed using the Reich–Moore approximation. The reconstructed cross section shows good agreement with those recommended by ENDF/B-VIII.1 library, confirming the reliability of the resonance parameters extracted from the capture–transmission measurements. Overall, the present measurements and analysis provide a set of resonance parameters for 169Tm, enhancing the experimental foundation for both nuclear physics research and nuclear industry.
The datasets presented in this paper, including the neutron transmission, neutron total cross section, and resonance parameters are openly available at https://www.doi.org/10.57760/sciencedb.j00213.00192 (Please use the private access link https://www.scidb.cn/s/MrUVry to access the dataset during the peer review process)-
Keywords:
- neutron transmission /
- neutron total cross section /
- resonance parameters /
- R-matrix
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