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Natural iridium acts as a high-quality activated detector for probing the energy components of a neutron fluence. Measurements of 191Ir(n,2n)190Ir cross sections are carried out near 14 MeV by the activation method based on 93Nb(n,2n)92mNb reaction cross section standard by PD-300 neutron generator DT neutron source. The (n,2n) products are measured by using a calibrated high pure Ge detector. The cross sections of 191Ir(n,2n)190Ir, σm2 and σg+m1, are measured carefully. The 191Ir(n,2n)190Ir cross sections: σm2, σg+m1, σg+m1+m2 and cross section ratio of σm2/σg+m1 are obtained in an energy range of 13.40–14.86 MeV. Experimental uncertainties are in a range of 3.4%–3.5%. The measured cross sections for the reaction of 191Ir(n,2n)190Ir at 14 MeV are σm2 = (136.05 ± 4.93) mb, σg+m1 = (1972.35 ± 67.06) mb, σg+m1+m2 = (2108.40 ± 71.99) mb, and σm2/σg+m1 = 0.0690 ± 0.0024. The present data are compared with the previous experimental data and the ENDF/B-VIII.0 and JEFF3.0/A evaluated data, showing that the experimental data from the literature are in good agreement with the present data for σg+m1, the evaluated data from JEFF3.0/A are underestimated by 5%–20% in comparison with the present data for σm2, the evaluated data from ENDF/B-VIII.0 are underestimated by 10% in comparison with the present data for σm2, and the ENDF/B-VIII.0 data are consistent with the present data for σg+m1+m2. The discrepancies between the data from the literature and the present data are analyzed and clarified. The present data show significant improvement in accuracy in comparison with data from the literature, these results provide more reliable nuclear data for improving the future evaluation.
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Keywords:
- cross section /
- Ir /
- activation method /
- DT neutron source
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Zhang F, Kong X Z, Pu Z S, Zhu X B 2002 High Energy Phys. Nucl. Phys. 22 678
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Zhu C X 2006 CNIC-01866 CAEP-0178 1 (in Chinese)
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图 1 190Ir衰变纲图
Figure 1. Simplified representation of formation and decay of 190Ir.
图 2 (n,2n)激发函数实验装置
Figure 2. Experiment assembly of (n,2n) excitation fuction.
图 3 样品放置
Figure 3. Sample setting.
图 4 样品及实验装置照片
Figure 4. The picture of experiment assembly and sample.
图 5 高纯锗探测效率曲线
Figure 5. Efficiency-energy curve for Ge detector.
图 6 冷却2 d后的铱样品γ谱
Figure 6. The γ-ray spectra of iridium sample with 2 d cooling time.
图 7 190Ir激发态γ谱
Figure 7. The γ-ray spectra of 190 m2Ir.
图 8 92 mNb的γ谱
Figure 8. The γ-ray spectra of 92 mNb.
图 9 σg+m1实验结果与文献及评价数据的比较
Figure 9. Comparison with reference and the available evaluated data of σg+m1.
图 10 σm2与文献及评价数据的比较
Figure 10. Comparison with reference and the available evaluated data of σm2.
图 11 σg+m1+m2与文献及评价数据的比较
Figure 11. Comparison with reference and the available evaluated data of σg+m1+m2.
表 1 样品参数
Table 1. Sample characteristics.
样品 纯度/% 同位素成分/% 厚度/mm 直径/mm Nb 99.999 93Nb 100 0.5 20 Ir 99.95 191Ir 37.3 0.5 20 193Ir 62.7 
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表 2 在实验数据分析中使用的同位素参数
Table 2. Details of radioactivity constants used in analysis of experimental data.
核素 半衰期 Eγ/keV Iγ 92mNb 10.15 d 934.44 0.9915 190gIr 11.78 d 371.24 0.216 190m2Ir 3.087 h 616.50 0.9015
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表 3 191Ir(n,2n)190Ir反应截面及截面比实验结果
Table 3. The 191Ir(n,2n)190Ir cross sections and cross section ratio from this work.
En/MeV σg+m1/mb σm2/mb σ/mb σm2/σg+m1 13.40 1939.42 ± 65.94 122.09 ± 4.29 2061.51 ± 70.23 0.0630 ± 0.0022 13.60 1957.66 ± 66.56 128.30 ± 4.58 2085.96 ± 71.14 0.0655 ± 0.0023 13.80 1963.28 ± 66.75 132.92 ± 4.85 2096.20 ± 71.60 0.0677 ± 0.0024 14.00 1972.35 ± 67.06 136.05 ± 4.93 2108.40 ± 71.99 0.0690 ± 0.0024 14.20 1977.33 ± 67.23 140.08 ± 5.03 2117.41 ± 72.26 0.0708 ± 0.0025 14.40 1981.92 ± 67.39 150.98 ± 5.34 2132.90 ± 72.73 0.0762 ± 0.0026 14.60 1980.04 ± 67.32 161.50 ± 5.82 2141.54 ± 73.14 0.0816 ± 0.0029 14.80 1981.45 ± 67.37 164.25 ± 5.87 2145.70 ± 73.24 0.0829 ± 0.0029 14.86 1964.28 ± 66.79 158.56 ± 5.72 2122.84 ± 72.51 0.0807 ± 0.0028
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表 4 反应截面测量结果的不确定度
Table 4. Uncertainties in the cross section.
不确定度来源 不确定度
%93Nb(n,2n)92mNb反应截面数据 2.0 伴随α粒子相对监测 1.0 HPGe探测器效率刻度 2.0 特征γ射线峰计数 0.7—0.9 衰变数据 1.0 时间因子 0.5 修正因子 1.0 总不确定度 3.4—3.5
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[1] Chadwick M B, Ignatyuk A V, Pashchenko A B, Vonach H, Young P G 1997 Fusion Eng. Des 37 79
Google Scholar
[2] Chadwick M B, Frankle S, Trellue H, Talou P, Kawano T, Young P G, MacFarlane R E, Wilkerson C W 2007 Nucl. Data Sheets 108 2716
Google Scholar
[3] Chadwick M B 2014 Nucl. Data Sheets 120 297
Google Scholar
[4] Qaim S M 1972 Nucl. Phys. A 185 614
Google Scholar
[5] Konno C, Ikeda Y, Oishi K, Kawade K, Yamamoto H, Maekawa H 1993 JAERI 1329 199310
[6] Patronis N, Papadopoulos C T, Galanopoulsos S, Kokkoris M, Perdikakis G, Vlastou R, Lagoyanis A, Harissopulos S 2007 Phys. Rev. C 75 034607
Google Scholar
[7] Kalamara A, Vlastou R, Kokkoris M, Chasapoglou S, Stamatopoulos A, Patronis N, Serris M, Lagoyanis A and Harissopulos S 2018 Phys. Rev. C 98 034607
Google Scholar
[8] Bayhurst B P, Gilmore J S, Prestwood R J, Wilhelmy J B, Jarmie N, Erkkila B H, Hardekopf R A 1975 Phys. Rev. C 12 451
[9] Herman M, Marcinkowski A, Stankiewic K 1984 Nucl. Phys. A 430 69
Google Scholar
[10] 张锋, 孔祥忠, 蒲忠胜, 朱学彬 2002 高能物理与核物理 22 678
Zhang F, Kong X Z, Pu Z S, Zhu X B 2002 High Energy Phys. Nucl. Phys. 22 678
[11] Filatenkov A A, Chuvaev S V 2003 Khlopin Radiev. Inst. , Leningrad Reports. 259
[12] Bormann M, Bissem H H, Magiera E, Warnemunde R 1970 Nucl. Phys. A 157 481
Google Scholar
[13] Singh B 2003 Nucl. Data Sheets 99 275
Google Scholar
[14] nudat2 Benjamin S, http://www.nndc.bnl.gov/ [2021-8-20]
[15] Zolotarev K I 2010 INDC International Nuclear Data Committee. INDC(NDS)-0584
[16] Zhu C X, Chen Y, Mou Y F, Zheng P, He T, Wang X H, An L, Guo H P 2011 Nucl. Sci. Eng 169 188
Google Scholar
[17] Zhu C X, Wang J, Jiang L, Zheng P 2020 Chin. Phys. C 44 034001
Google Scholar
[18] Lewis V E, Zieba K J 1980 Nucl. Instrum. Method 174 141
Google Scholar
[19] 朱传新 2006 中国核科技报告 第2集 CNIC-01866 CAEP-0178 1
Zhu C X 2006 CNIC-01866 CAEP-0178 1 (in Chinese)
[20] Brown D A, Chadwick M B, Capote R, Kahler A C, Trkov A, Herman M W, Sonzogni A A, Danon Y, Carlson A D, Dunn M, Smith D L, Hale G M, Arbanas G, Arcilla R, Bates C R, Beck B, Becker B, Brown F, Casperson R J, Conlin J, Cullen D E, Descalle M A, Firestone R, Gaines T, Guber K H, Hawari A I, Holmes J, Johnson T D, Kawano T, Kiedrowski B C, Koning A J, Kopecky S, Leal L, Lestone J P, Lubitz C, Márquez Damián J I, Mattoon C M, McCutchan E A, Mughabghab S, Pronyaev V G, Roubtsov D, Rochman D, Romano P, Schillebeeckx P, Simakov S, Sin M, Sirakov I, Sleaford B, Sobes V, Soukhovitskii E S, Stetcu I, Talou P, Thompson I, Marck S V D, Welser-Sherrill L, Wiarda D, White M, Wormald J L, Wright R Q, Zerkle M, Žerovnik G, Zhu Y 2018 Nucl. Data Sheets 148 1
Google Scholar
[21] Kellett M A, Bersillon O, Mills R W 2009 JEFF Report 20
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