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The neutron total cross section is one of the most fundamental nuclear data. In the low-energy resonance region, discrepancies among measurements arise from experimental backgrounds, sample self-shielding, and instrumental broadening, which complicate the precise determination of cross sections. In this work, the neutron total cross section of 169Tm is measured at the Back-n facility of the China Spallation Neutron Source (CSNS). Wing-shaped lithium glass detectors are used to record the transmitted neutron signals from samples with thicknesses of 0.5 mm and 4.5 mm. The raw data are processed, including time-of-flight correction and normalization to the incident proton number, to account for the fluctuations in the proton beam intensity. The in-beam γ background is quantified using the saturated resonance absorption technique with glass scintillators. After background subtraction, transmission and total cross-section data are obtained in an energy range of 1–100 eV. The measured spectra are analyzed using the SAMMY code within the framework of the R-matrix. Capture data are incorporated to improve the reliability of the extracted resonance parameters. For the resonance near 8 eV, the Γγ is set to the library average value of 86 meV. The resonance energy is 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 are evaluated. Based on the extracted parameters, the neutron total cross section of 169Tm is 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 .-
Keywords:
- neutron transmission /
- neutron total cross section /
- resonance parameters /
- R-matrix
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图 1 测量装置示意图
Figure 1. Schematic diagram of measurement device.
图 2 0.5 mm样品本底
Figure 2. Background of a 0.5 mm sample.
图 3 中子透射率与SAMMY拟合结果
Figure 3. Neutron transmission and SAMMY fitting results.
图 4 169Tm的中子全截面与实验库、评价库对比
Figure 4. Comparison of the 169Tm neutron total cross section with EXFOR and ENDF libraries.
图 5 透射率拟合结果
Figure 5. The results of fitting transmission.
图 6 本工作与ENDF/B-Ⅷ.1推荐的共振参数重构截面对比
Figure 6. Comparison of the reconstructed cross section of the resonance parameters in this work with those recommended by ENDF/B-VIII.1 library.
表 1 169Tm样品的参数
Table 1. Parameters of the 169Tm sample.
样品 长度/mm 宽度/mm 质量/mg 样品面密度/(atom·b–1) 1# 60.34±0.05 60.98±0.08 17542.48±0.30 1.694×10–3 2# 60.37±0.11 60.62±0.02 151679.48±0.46 1.472×10–2 
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表 2 169Tm中子核反应共振参数与ENDF/B-VIII.1 推荐值对比
Table 2. Comparison of 169Tm Neutron reaction resonance parameters with ENDF/B-VIII.1 recommended values.
En /eV Γn /meV Γγ /meV k J 本工作 ENDF/B-VIII.1 本工作 ENDF/B-VIII.1 本工作 ENDF/B-VIII.1 本工作 ENDF/B-VIII.1 3.908±0.002 3.906 7.38±0.24 7.47 105.70±7.40 102.4 5.17±0.21 5.22 1 14.33±0.01 14.32 9.13±0.16 9.12 98.80±6.92 97.1 2.09±0.14 2.08 0 17.43±0.01 17.42 5.46±0.04 5.74 81.40±5.70 81.4 1.28±0.04 1.34 0 28.73±0.26 28.90 0.21±0.01 0.21 93.70±6.56 95.0 0.16±0.01 0.16 1 34.85±0.01 34.79 6.86±0.06 5.87 86.00±6.02 86.0 4.76±0.06 4.12 1 37.64±0.06 37.51 0.45±0.02 0.46 123.96±8.68 86.0 0.34±0.02 0.34 1 44.88±0.01 44.79 2.91±0.18 3.47 99.00±6.93 93.0 2.12±0.17 2.51 1 50.74±0.07 50.58 5.06±0.37 5.40 89.01±6.23 79.0 3.59±0.33 3.79 1 59.29±0.02 59.07 10.13±0.21 10.0 86.00±6.02 84.0 6.80±0.18 6.70 1 63.17±0.01 62.97 0.96±0.06 1.00 78.02±5.46 78.0 0.71±0.06 0.74 1 65.98±0.01 65.75 139.18±0.49 113 83.00±5.81 83.0 13.00±2.28 11.96 0 83.55±0.13 83.18 7.50±0.09 7.53 85.00±5.95 85.0 5.17±0.09 5.19 1 94.16±0.06 94.10 35.08±1.92 32.0 119.12±8.14 86.0 18.56±1.19 17.49 1 95.95±0.02 95.40 4.25±0.32 3.80 71.00±4.97 71.0 1.00±0.29 0.90 0
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表 3 两种总自旋态的中子核反应共振参数
Table 3. Resonance parameters of neutron nuclear reactions for two spin states.
J En /eV Γn /meV Γγ /meV 0 8.037±0.009 0.036±0.002 86 1 8.037±0.009 0.015±0.001 86
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