Measurement of neutron capture cross-sections and extraction of neutron resonance parameters at 1—500 eV for <sup>109</sup>Ag

XIE Wen; CHE Guoliang; JIANG Wei; DONG Gaoyang; WENG Chuxuan; JIANG Xin; LI Xinxiang; FENG Song; JIANG Bing; REN Jie; LIN Ziang; YING Mingyang; JIANG Ting; HE Rui; WANG Hongwei; FAN Gongtao; LIU Longxiang; ZHANG Yue; HAO Zirui; ZHANG Suyalatu; WANG Dexin; LUO Wen

doi:10.7498/aps.75.20251270

Abstract
¹⁰⁹Ag is located on the pathway of the slow neutron capture process, and 79% of ¹⁰⁹Ag is generated through a rapid neutron capture process. Meanwhile, the mass fraction of ¹⁰⁹Ag in Ag-In-Cd control rods is 38.56%. Therefore, the neutron capture cross-section of ¹⁰⁹Ag is crucial for both nuclear energy and nuclear astrophysics applications. In this work, a neutron capture cross-section is measured using a ¹⁰⁹Ag isotope target at the Back-n white neutron facility of the China Spallation Neutron Source (CSNS). Neutron capture cross-sections in the 1–500 eV energy region are obtained by combining the time-of-flight method and the pulse-height weighting technique. The ¹⁰⁹Ag resonance energy, neutron resonance width, and gamma resonance width parameters are extracted using the SAMMY code, which is based on R-matrix theory. The neutron resonance parameters extracted from this study at 139.4 eV are in agreement with the values evaluated in the JENDL-4.0, while the parameters at 169.9 eV and 328.1 eV are in agreement with the values evaluated in the JEFF-4.0. Additionally, the result at 259.3 eV is consistent with the value evaluated in the CENDL-3.2.The datasets presented in this paper are openly available at https://www.doi.org/10.57760/sciencedb.j00213.00197.

Keywords:
neutron capture cross-section /

white neutron source /

resonance parameter
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图 1 ¹⁰⁹Ag区域的s过程反应路径示意图

Figure 1. The s-process reaction path in the region of ¹⁰⁹Ag.

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图 2 获取中子共振参数的步骤

Figure 2. Procedure for obtaining neutron resonance parameters.

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图 3 Back-n设施中的C₆D₆探测器

Figure 3. Photograph of the C₆D₆ detector in the Back-n facility of CSNS.

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图 4 归一化的实验能谱

Figure 4. Normalized experimental energy spectrum.

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图 5 ¹⁰⁹Ag实验靶加吸收片和不加吸收片的对比以及本底能谱

Figure 5. The ¹⁰⁹Ag target with and without filters and background energy spectrum.

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图 6 C₆D₆效率　(a) 原始效率; (b) 加权后的探测效率; (c) 加权效率和$ \gamma $射线能量的比值

Figure 6. The C₆D₆ efficiency: (a) Original efficiency; (b) weighted efficiency; (c) the ratio between the weighted efficiency and the γ-ray energy.

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图 7 f_c随中子能量的变化

Figure 7. Variation of the f_c with neutron energy.

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图 8 实验数据的截面计算结果

Figure 8. Calculated cross-section of the experimental data.

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图 9 实验提取的俘获核K与各主流评价库的对比

Figure 9. Comparison between the capture Kernels K from the major evaluations and the ones from this work.

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表 1 实验所用靶材信息

Table 1. Information of experimental targets.

实验靶	纯度/%	直径/mm	靶厚/mm	质量/g
¹⁰⁹Ag	>99%	30.00±0.02	0.100±0.005	0.745±0.005
¹⁹⁷Au	>99%	30.00±0.02	0.100±0.005	1.423±0.005
^natC	—	30.00±0.02	0.100±0.005	0.160±0.005
^natPb	—	30.00±0.02	0.100±0.005	0.787±0.005

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表 2 实验测量中不确定度来源

Table 2. The sources of uncertainty in experimental measurement.

不确定度来源	组成	不确定度/%
实验条件	加速器功率	<1.5
	中子能谱(<0.15 MeV)	<8.0
	靶参数	<1.5
数据分析	归一化	<2.0
	PHWT方法	<3.0
	双束团解谱	<2.0
	本底扣除	<2.0
数理统计	统计误差	<0.7

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表 3 实验提取的¹⁰⁹Ag的共振参数与各主流评价库对比

Table 3. Comparison of the ¹⁰⁹Ag resonance parameters obtained from experiment and the major evaluated libraries.

$ {E}_{\text{n}} $/eV	$ {{\varGamma}}_{\gamma } $/meV					$ {{\varGamma}}_{\text{n}} $/meV
$ {E}_{\text{n}} $/eV	This Work	DB#1/#5	DB#2	DB#3	DB#4	This Work	DB#1/#5	DB#2	DB#3	DB#4
5.1	131.11±8.35	130.00	136.00	136.00	135.30	10.02±0.77	12.73	12.70	12.67	13.24
30.6	135.53±3.89	130.00	128.00	130.00	125.50	4.62±0.12	7.33	7.30	7.20	7.38
40.4	151.81±5.30	131.00	131.00	130.00	139.70	2.57±0.07	5.33	6.20	5.87	4.76
55.9	146.22±5.78	139.00	139.00	130.00	130.60	14.94±0.50	37.20	36.80	21.60	36.09
71.2	111.70±5.45	120.00	117.00	130.00	130.00	12.37±0.49	26.67	26.40	25.20	27.49
88.1	149.92±8.18	130.00	131.00	130.00	127.90	2.84±0.11	6.40	6.20	5.47	5.91
133.8	108.54±2.15	120.00	120.00	130.00	130.00	274.05±4.84	80.00	82.00	92.13	85.86
139.4	137.93±12.29	133.00	133.00	130.00	130.00	2.02±0.09	6.00	5.00	2.00	1.73
169.9	133.81±11.21	163.00	130.00	130.00	130.00	1.05±0.04	0.24	0.29	1.44	1.34
173.0	134.96±8.34	140.00	130.00	130.00	130.00	17.42±0.55	44.93	50.00	44.93	46.48
209.0	112.91±9.51	133.00	123.00	130.00	130.00	10.02±1.28	24.00	24.40	24.80	26.36
252.4	123.58±11.90	124.00	130.00	130.00	130.00	6.28±0.54	5.87	11.80	5.87	5.87
259.3	131.94±13.07	111.00	130.00	130.00	130.00	5.03±0.50	13.60	5.20	13.60	7.92
272.9	137.47±13.60	141.00	130.00	130.00	130.00	1.95±0.19	2.00	4.00	2.00	1.82
291.1	132.99±13.10	140.00	140.00	130.00	130.00	12.60±1.11	33.20	34.20	11.07	10.92
293.2	129.80±12.98	163.00	130.00	130.00	130.00	1.67±0.15	0.40	0.68	0.40	0.40
300.6	130.38±12.94	141.00	130.00	130.00	130.00	1.66±0.16	6.00	0.93	6.00	4.27
317.7	102.90±8.91	141.00	124.00	130.00	130.00	121.70±11.33	178.67	158.00	200.00	153.70
328.1	134.04±12.99	163.00	130.00	130.00	130.00	6.82±0.63	0.87	15.40	0.87	6.00
387.3	153.07±13.65	147.00	147.00	130.00	130.00	44.91±4.19	43.33	43.10	55.33	43.02
398.2	140.83±13.94	140.00	140.00	130.00	130.00	22.48±1.96	22.00	22.70	13.33	20.77
405.6	115.84±13.20	146.00	143.00	130.00	130.00	182.11±18.87	200.00	190.00	168.00	210.60
428.9	126.15±12.41	141.00	130.00	130.00	130.00	19.06±1.83	38.00	37.40	18.27	13.32
470.0	120.00±10.92	141.00	134.00	130.00	130.00	129.26±11.96	138.00	148.00	138.00	139.30
487.4	134.34±13.15	141.00	130.00	130.00	130.00	41.76±4.15	45.40	46.80	22.80	15.77

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[13]	Zhang Qi-Wei, Luan Guang-Yuan, Ren Jie, Ruan Xi-Chao, He Guo-Zhu, Bao Jie, Sun Qi, Huang Han-Xiong, Wang Zhao-Hui, Gu Min-Hao, Yu Tao, Xie Li-Kun, Chen Yong-Hao, An Qi, Bai Huai-Yong, Bao Yu, Cao Ping, Chen Hao-Lei, Chen Qi-Ping, Chen Yu-Kai, Chen Zhen, Cui Zeng-Qi, Fan Rui-Rui, Feng Chang-Qing, Gao Ke-Qing, Han Chang-Cai, Han Zi-Jie, He Yong-Cheng, Hong Yang, Huang Wei-Ling, Huang Xi-Ru, Ji Xiao-Lu, Ji Xu-Yang, Jiang Wei, Jiang Hao-Yu, Jiang Zhi-Jie, Jing Han-Tao, Kang Ling, Kang Ming-Tao, Li Bo, Li Chao, Li Jia-Wen, Li Lun, Li Qiang, Li Xiao, Li Yang, Liu Rong, Liu Shu-Bin, Liu Xing-Yan, Mu Qi-Li, Ning Chang-Jun, Qi Bin-Bin, Ren Zhi-Zhou, Song Ying-Peng, Song Zhao-Hui, Sun Hong, Sun Kang, Sun Xiao-Yang, Sun Zhi-Jia, Tan Zhi-Xin, Tang Hong-Qing, Tang Jing-Yu, Tang Xin-Yi, Tian Bin-Bin, Wang Li-Jiao, Wang Peng-Cheng, Wang Qi, Wang Tao-Feng, Wen Jie, Wen Zhong-Wei, Wu Qing-Biao, Wu Xiao-Guang, Wu Xuan, Yang Yi-Wei, Yi Han, Yu Li, Yu Yong-Ji, Zhang Guo-Hui, Zhang Lin-Hao, Zhang Xian-Peng, Zhang Yu-Liang, Zhang Zhi-Yong, Zhao Yu-Bin, Zhou Lu-Ping, Zhou Zu-Ying, Zhu Dan-Yang, Zhu Ke-Jun, Zhu Peng, Zhu Xing-Hua. Cross section measurement of neutron capture reaction based on back-streaming white neutron source at China spallation neutron source. Acta Physica Sinica, doi: 10.7498/aps.70.20210742
[14]	Ren Jie, Ruan Xi-Chao, Chen Yong-Hao, Jiang Wei, Bao Jie, Luan Guang-Yuan, Zhang Qi-Wei, Huang Han-Xiong, Wang Zhao-Hui, An Qi, Bai Huai-Yong, Bao Yu, Cao Ping, Chen Hao-Lei, Chen Qi-Ping, Chen Yu-Kai, Chen Zhen, Cui Zeng-Qi, Fan Rui-Rui, Feng Chang-Qing, Gao Ke-Qing, Gu Min-Hao, Han Chang-Cai, Han Zi-Jie, He Guo-Zhu, He Yong-Cheng, Hong Yang, Huang Wei-Ling, Huang Xi-Ru, Ji Xiao-Lu, Ji Xu-Yang, Jiang Hao-Yu, Jiang Zhi-Jie, Jing Han-Tao, Kang Ling, Kang Ming-Tao, Li Bo, Li Chao, Li Jia-Wen, Li Lun, Li Qiang, Li Xiao, Li Yang, Liu Rong, Liu Shu-Bin, Liu Xing-Yan, Mu Qi-Li, Ning Chang-Jun, Qi Bin-Bin, Ren Zhi-Zhou, Song Ying-Peng, Song Zhao-Hui, Sun Hong, Sun Kang, Sun Xiao-Yang, Sun Zhi-Jia, Tan Zhi-Xin, Tang Hong-Qing, Tang Jing-Yu, Tang Xin-Yi, Tian Bin-Bin, Wang Li-Jiao, Wang Peng-Cheng, Wang Qi, Wang Tao-Feng, Wen Jie, Wen Zhong-Wei, Wu Qing-Biao, Wu Xiao-Guang, Wu Xuan, Xie Li-Kun, Yang Yi-Wei, Yi Han, Yu Li, Yu Tao, Yu Yong-Ji, Zhang Guo-Hui, Zhang Lin-Hao, Zhang Xian-Peng, Zhang Yu-Liang, Zhang Zhi-Yong, Zhao Yu-Bin, Zhou Lu-Ping, Zhou Zu-Ying, Zhu Dan-Yang, Zhu Ke-Jun, Zhu Peng. In-beam γ-rays of back-streaming white neutron source at China Spallation Neutron Source. Acta Physica Sinica, doi: 10.7498/aps.69.20200718
[15]	Wang Xun, Zhang Feng-Qi, Chen Wei, Guo Xiao-Qiang, Ding Li-Li, Luo Yin-Hong. Application and evaluation of Chinese spallation neutron source in single-event effects testing. Acta Physica Sinica, doi: 10.7498/aps.68.20181843
[16]	Bao Jie, Chen Yong-Hao, Zhang Xian-Peng, Luan Guang-Yuan, Ren Jie, Wang Qi, Ruan Xi-Chao, Zhang Kai, An Qi, Bai Huai-Yong, Cao Ping, Chen Qi-Ping, Cheng Pin-Jing, Cui Zeng-Qi, Fan Rui-Rui, Feng Chang-Qing, Gu Min-Hao, Guo Feng-Qin, Han Chang-Cai, Han Zi-Jie, He Guo-Zhu, He Yong-Cheng, He Yue-Feng, Huang Han-Xiong, Huang Wei-Ling, Huang Xi-Ru, Ji Xiao-Lu, Ji Xu-Yang, Jiang Hao-Yu, Jiang Wei, Jing Han-Tao, Kang Ling, Kang Ming-Tao, Lan Chang-Lin, Li Bo, Li Lun, Li Qiang, Li Xiao, Li Yang, Li Yang, Liu Rong, Liu Shu-Bin, Liu Xing-Yan, Ma Ying-Lin, Ning Chang-Jun, Nie Yang-Bo, Qi Bin-Bin, Song Zhao-Hui, Sun Hong, Sun Xiao-Yang, Sun Zhi-Jia, Tan Zhi-Xin, Tang Hong-Qing, Tang Jing-Yu, Wang Peng-Cheng, Wang Tao-Feng, Wang Yan-Feng, Wang Zhao-Hui, Wang Zheng, Wen Jie, Wen Zhong-Wei, Wu Qing-Biao, Wu Xiao-Guang, Wu Xuan, Xie Li-Kun, Yang Yi-Wei, Yang Yi, Yi Han, Yu Li, Yu Tao, Yu Yong-Ji, Zhang Guo-Hui, Zhang Jing, Zhang Lin-Hao, Zhang Li-Ying, Zhang Qing-Min, Zhang Qi-Wei, Zhang Yu-Liang, Zhang Zhi-Yong, Zhao Ying-Tan, Zhou Liang, Zhou Zu-Ying, Zhu Dan-Yang, Zhu Ke-Jun, Zhu Peng. Erratum: Experimental result of back-streaming white neutron beam characterization at Chinese spallation neutron source. Acta Physica Sinica, doi: 10.7498/aps.68.109901
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Measurement of neutron capture cross-sections and extraction of neutron resonance parameters at 1—500 eV for ¹⁰⁹Ag

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Measurement of neutron capture cross-sections and extraction of neutron resonance parameters at 1—500 eV for 109Ag

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Measurement of neutron capture cross-sections and extraction of neutron resonance parameters at 1—500 eV for ¹⁰⁹Ag