Measurement of the neutron total cross section of carbon at the Back-n white neutron beam of CSNS

被引：20

作者：

Liu, Xing-Yan ^{[1
]}

Yang, Yi-Wei ^{[1
]}

Liu, Rong ^{[1
]}

Wen, Jie ^{[1
]}

Wen, Zhong-Wei ^{[1
]}

Han, Zi-Jie ^{[1
]}

Ren, Zhi-Zhou ^{[1
]}

An, Qi ^{[2
,3
]}

Bai, Huai-Yong ^{[4
]}

Bao, Jie ^{[5
]}

Cao, Ping ^{[2
,3
]}

Chen, Qi-Ping ^{[1
]}

Chen, Yong-Hao ^{[6
,7
]}

Cheng, Pin-Jing ^{[8
]}

Cui, Zeng-Qi ^{[4
]}

Fan, Rui-Rui ^{[2
,6
,7
]}

Feng, Chang-Qing ^{[2
,3
]}

Gu, Min-Hao ^{[2
,6
]}

Guo, Feng-Qin ^{[6
,7
]}

Han, Chang-Cai ^{[9
]}

He, Guo-Zhu ^{[5
]}

He, Yong-Cheng ^{[6
,7
]}

He, Yue-Feng ^{[8
]}

Huang, Han-Xiong ^{[5
]}

Huang, Wei-Ling ^{[6
,7
]}

Huang, Xi-Ru ^{[2
,3
]}

Ji, Xiao-Lu ^{[2
,6
]}

Ji, Xu-Yang ^{[2
,10
]}

Jiang, Hao-Yu ^{[4
]}

Jiang, Wei ^{[6
,7
]}

Jing, Han-Tao ^{[6
,7
]}

Kang, Ling ^{[6
,7
]}

Kang, Ming-Tao ^{[6
,7
]}

Li, Bo ^{[6
,7
]}

Li, Lun ^{[6
,7
]}

Li, Qiang ^{[6
,7
]}

Li, Xiao ^{[6
,7
]}

Li, Yang ^{[2
,6
,7
]}

Liu, Shu-Bin ^{[2
,3
]}

Luan, Guang-Yuan ^{[4
]}

Ma, Ying-Lin ^{[6
,7
]}

Ning, Chang-Jun ^{[6
,7
]}

Qi, Bin-Bin ^{[3
]}

Ren, Jie ^{[5
]}

Ruan, Xi-Chao ^{[5
]}

Song, Zhao-Hui ^{[9
]}

Sun, Hong ^{[6
,7
]}

Sun, Xiao-Yang ^{[6
,7
]}

Sun, Zhi-Jia ^{[2
,6
,7
]}

机构：

[1] China Acad Engn Phys, Inst Nucl Phys & Chem, Mianyang 621900, Sichuan, Peoples R China

[2] Chinese Acad Sci, State Key Lab Particle Detect & Elect, Beijing 100049, Peoples R China

[3] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China

[4] Peking Univ, Sch Phys, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China

[5] China Inst Atom Energy, Key Lab Nucl Data, Beijing 102413, Peoples R China

[6] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China

[7] Spallat Neutron Source Sci Ctr, Dongguan 523803, Peoples R China

[8] Univ South China, Hengyang 421001, Peoples R China

[9] Northwest Inst Nucl Technol, Xian 710024, Shaanxi, Peoples R China

[10] Univ Sci & Technol China, Dept Engn & Appl Phys, Hefei 230026, Anhui, Peoples R China

[11] Xi An Jiao Tong Univ, Xian 710049, Shaanxi, Peoples R China

[12] Beihang Univ, Beijing 100083, Peoples R China

来源：

NUCLEAR SCIENCE AND TECHNIQUES | 2019年 / 30卷 / 09期

基金：

中国国家自然科学基金;

关键词：

CSNS; Back-n white neutron source; NTOX; Neutron total cross section; Carbon; Multilayer fast fission chamber; DESIGN;

D O I：

10.1007/s41365-019-0660-9

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

To verify the performance of the neutron total cross-sectional spectrometer, the neutron total cross section of carbon is initially measured in the energy range of 1eV to 20MeV using the time-of-flight method. The measurement is performed at the Back-n white neutron source with a 76-m time-of-flight path using the China Spallation Neutron Source. A multilayer fast fission chamber with U-235 and U-238 is employed as the neutron detector. The diameter and thickness of the natural graphite sample are 70mm and 40mm, respectively. Signal waveforms are collected using a data acquisition system. Off-line data processing was used to obtain the neutron time-of-flight spectra and transmissions. The uncertainty of the counting statistics is generally approximately 3% for each bin in the energy range of 1-20MeV. It is determined that the results for the neutron total cross section of carbon obtained using U-235 cells are in good agreement with the results obtained using U-238 cells within limits of statistical uncertainty. Moreover, the measured total cross sections show good agreement with the broadening evaluated data.

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页数：10

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