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Lithium is one of the main materials of fuel carrier salt in molten salt reactors. Its neutron cross section provides an important basic datum for physical design of molten salt reactor core and for evaluating the safety of the core during operation. The total neutron cross sections of natural lithium samples with thickness values of 8.00 mm and 15.0 mm are measured, respectively, in an energy range from 0.4 eV to 20 MeV by using a neutron total cross section spectrometer (NTOX) with the transmission method at the Back-n white neutron source of China Spallation Neutron Source (CSNS Back-n) with a 76.0 m time-of-flight path. High quality experimental data are obtained, especially in the energy region of keV and below, which supply a significative supplement of the data, thereby providing more abundant and reliable experimental data for nuclear data evaluation of lithium. Additionally, a theoretical analysis is carried out under the guidance of 1/v law and the multilevel R-matrix theory. And the resonance parameters of n+6,7Li reaction around the energy of 260 keV are extracted from the measured data.
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图 1 实验布局示意图
Figure 1. Schematic drawing of the layout of the measurement.
图 2 第一层235U裂变层时间-幅度二维谱 (a) 无束流空靶; (b) 有束流空靶
Figure 2. Amplitude-energy distribution in the first 235U cell: (a) Empty target without beam; (b) empty target with beam.
图 3 裂变室输出的时间信号示例
Figure 3. Signal of flight time in the fission chamber.
图 4 裂变层第1层235U共振裂变峰的高斯拟合
Figure 4. Gaussian fit of the resonance peaks in the first 235U cell.
图 5 裂变室测得的归一后的中子能谱
Figure 5. Normalized neutron energy spectrum measured by the fission chamber.
图 6 测得的天然锂样品的中子透射率
Figure 6. Measured transmission of the natural lithium samples.
图 7 实验测得的天然锂中子全截面数据与IRDFF评价数据库中的数据 (1 b = 10–28 m2)
Figure 7. The measured neutron total cross section of the natural lithium and the data from IRDFF (1 b = 10–28 m2).
图 8 1/v律拟合天然锂在0.4 eV—0.1 MeV中子能区全截面测量结果
Figure 8. Fitting results of the measured neutron total cross section of the natural lithium with 1/v law in the energy range of neutron from 0.4 eV to 0.1 MeV.
图 9 R矩阵理论拟合15.0 mm样品靶中子透射率结果
Figure 9. R-matrix analysis of the measured transmission of 15.0 mm natural lithium sample.
表 1 裂变层第1层235U共振峰高斯拟合峰值结果
Table 1. Parameters of the Gaussian fit of the resonance peaks of the first 235U.
共振峰/eV 裂变峰中心值对应的
信号输出时间 $ T_{\rm ff}^* $/nsTOF/ns 8.77 1892730 ± 34 1893569 12.40 1592672 ± 56 1593511 19.3 1276160 ± 46 1276999 注: *对应的误差为高斯拟合的误差, 即标准差. 
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[1] 江绵恒, 徐洪杰, 戴志敏 2012 中国科学院院刊 27 366
Google Scholar
Jiang M H, Xu H J, Dai Z M 2012 Bull. Chin. Acad. Sci. 27 366
Google Scholar
[2] Egorov M V 2019 Nucl. Phys. A 986 175
Google Scholar
[3] 胡继峰, 余呈刚, 邹春燕, 蔡翔舟, 韩建龙, 陈金根 2017 原子能科学技术 51 2013
Google Scholar
Hu J F, Yu C G, Zou C Y, Cai X Z, Han J L, Chen J G 2017 J. Atom. Ener. 51 2013
Google Scholar
[4] 胡继峰, 王小鹤, 李文江, 李晓晓, 韩建龙 2019 核技术 42 030601
Google Scholar
Hu J F, Wang X H, Li W J, Li X X, Han J L 2019 J. Nucl. Tech. 42 030601
Google Scholar
[5] Otuka N, Dupont E, Semkova V, Pritychenko B, Blokhin A I, Aikawae M, Babykinaf S, Bossantb M, Cheng G, Dunaevah S, Forresta R A, Fukahorii T, Furutachie N, Ganesanj S, Geg Z, Gritzayk O O, Hermanc M, Hlavačl S, Zhuang Y 2014 Nucl. Data Sheets 120 272
Google Scholar
[6] Dunning J R, Pegram G B, Fink G A, Mitchell D P 1935 Phys. Rev. 48 265
Google Scholar
[7] Havens W W, Rainwater J 1946 Phys. Rev. 70 154
Google Scholar
[8] Hibdon C T 1950 Phys. Rev. 79 747
Google Scholar
[9] Jing H T, Tang J Y, Tang H Q, Xia H H, Liang T J, Zhou Z Y, Zhong Q P, Ruan X C 2010 Nucl. Instr. Meth. A 621 91
Google Scholar
[10] Chen H S, Wang X L 2016 Nat. Mater. 15 689
Google Scholar
[11] An Q, Bai H Y, Bao J, et al. 2017 J. Instr. 12 07022
[12] 唐靖宇, 敬罕涛, 夏海鸿, 唐洪庆, 张闯, 周祖英, 阮锡超, 张奇玮, 杨征 2013 原子能科学技术 47 1089
Google Scholar
Tang J Y, Jing H T, Xia H H, Tang H Q, Zhang C, Zhou Z Y, Ruan X C, Zhang Q W, Yang Z 2013 J. Atom. Ener. 47 1089
Google Scholar
[13] Liu X Y, Yang Y W, Liu R, et al. 2019 Nucl. Sci. Tech. 30 139
Google Scholar
[14] 鲍杰, 陈永浩, 张显彭等 2019 68 080101
Google Scholar
Bao J, Chen Y H, Zhang X P, et al. 2019 Acta Phys. Sin. 68 080101
Google Scholar
[15] Yi H, Wang T F, Li Y, et al. 2020 J. Instr. 15 03026
[16] Jiang B, Han L J, Jiang W, Hu J F, Wang X H, Chen J G, Cai X Z 2021 Nucl. Instr. Meth. A 1013 165677
Google Scholar
[17] Reich C W, Moore M S 1958 Phys. Rev. 111 929
Google Scholar
[18] Trkov A, Griffin P J, Simakov S P, et al. 2020 Nucl. Data Sheets 163 1
Google Scholar
[19] Brown D A, Chadwick M B, Capote R, et al. 2018 Nucl. Data Sheets 148 1
Google Scholar
[20] Stelson P H, Preston W M 1951 Phys. Rev. 84 162
Google Scholar
[21] Johnson C H, Willard H B, Bair J K 1954 Phys. Rev. 96 985
Google Scholar
[22] 姜炳, 王小鹤, 韩建龙, 胡继峰, 陈金根, 蔡翔舟 2021 原子能科学技术 55 8
Google Scholar
Jiang B, Wang X H, Han J L, Hu J F, Chen J G, Cai X Z 2021 J. Atom. Ener. 55 8
Google Scholar
[23] Ajzenberg-Selove F, Lauritsen T 1974 Nucl. Phys. A 227 1
Google Scholar
[24] Tilley D R, Kelley J H, Godwin J L, Millener D J, Purcell J E, Sheu C G, Weller H R 2004 Nucl. Phys. A 754 155
[25] Koning A J, Rochman D, Sublet J C, Dzysiuk N, Fleming M, van der Marck S 2019 Nucl. Data Sheets 155 1
Google Scholar
[26] Willard H B, Bair J K, Kington J D, Cohn H O 1956 Phys. Rev. 101 765
Google Scholar
[27] Tilley D R, Cheves C M, Godwin J L, Hale G M, Hofmann H M, Kelley J H, Sheu C G, Weller H R 2002 Nucl. Phys. A 708 3
Google Scholar
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