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Laboratory astrophysics with laser-driven strong magnetic fields in China

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High Power Laser Science and Engineering 2016年第3期4卷 67-70页

作者： Fei-Lu wang Xiao-Xing pei bo Han hui-Gang Wei Da-Wei Yuan Gui-yun liang Gang zhao Jia-Yong Zhong Zhe zhang Bao-jun Zhu Yan-Fei li fang li Yu-Tong li Si-liang Zeng Shi-Yang Zou jie zhang Key Laboratory of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences University of Chinese Academy of Sciences Department of Astronomy Beijing Normal University Beijing National Laboratory of Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Institute of Applied Physics and Computational Mathematics Shanghai Jiao Tong University

In this paper, the recent studies of laboratory astrophysics with strong magnetic fields in China have been *** the Shenguang-II laser facility of the National Laboratory on High-Power Lasers and Physics, a laser-driven strong magnetic field up to 200 T has been achieved. The experiment was performed to model the interaction of solar wind with dayside magnetosphere. Also the low beta plasma magnetic reconnection(MR) has been studied. Theoretically, the model has been developed to deal with the atomic structures and processes in strong magnetic field. Also the study of shock wave generation in the magnetized counter-streaming plasmas is introduced.

关键词： Laboratory astrophysics laser strong magnetic fields

Large area^(3)He tube array detector with modular design for multi‑physics instrument at CSNS

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Nuclear Science and Techniques 2023年第1期34卷 1-12页

作者： lin Zhu Jian‑Rong zhou Yuan‑Guang Xia liang Xiao Hong Luo Xiao‑Juan zhou Wen‑Qin Yang Bei‑Ju Guan Xing‑Fen Jiang Yan‑Feng wang Hong Xu Hai‑yun Teng li‑Xin Zeng Jia‑jie li Lei Hu Ke zhou Yong‑Xiang Qiu pei‑Xun Shen jun Xu li‑Jiang liao Xiao‑Zhuang wang Gui‑An Yang Huai‑Chan Chen Ju‑Ping Xu zhi‑Duo li Song‑lin wang Jian Zhuang Yu‑Bin zhao jun‑Rong zhang Wen Yin zhi‑Jia Sun Yuan‑bo Chen Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China University of Chinese Academy of Sciences Beijing 100049China

The multi-physics instrument(MPI)is the first user cooperative instrument at the China Spallation Neutron Source(CSNS).It was designed to explore the structures of complex materials at multiple scales based on the neutron total scattering *** imposes the requirements for the detector,including a high detection efficiency to reduce the measurement time and a large solid angle coverage to cover a wide range of momentum *** satisfy these demands,a large-area array of 3He-filled linear position-sensitive detectors(LPSDs)was constructed,each with a diameter of 1 inch and pressure of 20 *** uses an orbicular layout of the detector and an eight-pack module design for the arrangement of 3He LPSDs,covering a range of scattering angles from 3°to 170°with a total detector area of approximately 7 *** detector works in air,which is separated from the vacuum environment to facilitate installation and *** characteristics of the MPI detector were investigated through Monte Carlo(MC)simulations using Geant4 and experimental *** results suggest that the detectors are highly efficient in the wavelength range of the MPI,and an efficiency over 25%is achievable for above 0.1 A neutrons.A minimal position resolution of 6.4 mm full width at half maximum(FWHM)along the tube length was achieved at a working voltage of 2200 V,and a deviation below 2 mm between the real and measured positions was attained in the beam *** detector module exhibited good consistency and an excellent counting rate capacity of up to 80 kHz,which satisfied the requirements of experiments with a high event *** of its operation over the past year have shown that the detector works steadily in sample experiments,which allows the MPI to serve the user program successfully.

关键词： Neutron detector LPSD Position resolution Counting rate capacity

In-beam gamma rays of CSNS Back-n characterized by black resonance filter

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Nuclear Science and Techniques 2024年第10期35卷 149-160页

作者： Jin-Cheng wang jie Ren Wei Jiang Xi-Chao Ruan ying-Yi liu Hao-Lan Yang Kuo-zhi Xu Xin-Yi Pan Qi Sun jie Bao Han-Xiong Huang Hao-fan Bai Jiang-bo Bai Ping cao Qi-Ping Chen Yong-Hao Chen Wen-Hao Duan An-Chuan fan Rui-Rui fan Chang-Qing Feng Min-Hao Gu Chang-Cai Han Zi-jie Han Guo-Zhu He Yong-Cheng He Yang Hong Yi-Wei Hu zhi-jie Jiang ling Kang Chang-lin Lan bo li Feng li Qiang li Xiao li Yang li jie liu Rong liu Shu-Bin liu Yi-Na liu Guang-Yuan Luan Chang-jun Ning Yi-Jia Qiu Wen-Kai Ren zhi-zhou Ren zhao-hui Song Kang Sun zhi-Xin Tan Jing-Yu Tang Sheng-Da Tang li-Jiao wang Peng-Cheng wang zhao-hui wang Zhong-Wei Wen Xiao-Guang Wu Xuan Wu Ze-Peng Wu Cong Xia li-Kun Xie Han Yi Tao Yu Yong-Ji Yu Guo-hui zhang Hang-Chang zhang Qi-Wei zhang Xian-Peng zhang Yu-liang zhang zhi-Yong zhang Mao-Yuan zhao zhi-Hao zhou Ke-jun Zhu Chong Zou Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Institute of Modern Physics Fudan UniversityShanghai 200433China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China USTC Archaeometry Lab University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Particle Detection and Electronics Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Institute of Advanced Technology University of Science and Technology of ChinaHefei 230027China

The back-streaming white-neutron beamline(Back-n)of the China Spallation Neutron Source is an essential neutronresearch platform built for the study of nuclear data,neutron physics,and neutron *** types of cross-sectional neutron-reaction measurements have been performed at Back-n since early *** measurements have shown that a significant number of gamma rays can be transmitted to the experimental stations of Back-n along with the neutron *** gamma rays,commonly referred to as in-beam gamma rays,can induce a non-negligible experimental background in neutron-reaction *** the characteristics of in-beam gamma rays is important for understanding the experimental ***,measuring in-beam gamma rays is challenging because most gamma-ray detectors are sensitive to neutrons;thus,discriminating between neutron-induced signals and those from in-beam gamma rays is *** this study,we propose the use of the black resonance filter method and a CeBr_(3) scintillation detector to measure the characteristics of the in-beam gamma rays of *** types of black resonance filters,^(181)Ta,^(59)Co,^(nat)Ag,and^(nat)Cd,were used in this *** time-of-flight(TOF)technique was used to select the detector signals remaining in the absorption region of the TOF spectra,which were mainly induced by in-beam gamma *** energy distribution and flux of the in-beam gamma rays of Back-n were determined by analyzing the deposited energy spectra of the CeBr_(3) scintillation detector and using Monte Carlo *** on the results of this study,the background contributions from in-beam gamma rays in neutron-reaction measurements at Back-n can be reasonably evaluated,which is beneficial for enhancing both the experimental methodology and data analysis.

关键词： In-beam gamma rays Back-n CeBr_(3)scintillator Black filter resonance technique

10B-doped MCP detector developed for neutron resonance imaging at Back-n white neutron source

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Nuclear Science and Techniques 2024年第8期35卷 58-68页

作者： Qiang li li‑Jiao wang Jing‑Yu Tang Xiang‑Biao Qiu Zhen Chen Mao‑Yuan zhao Chang‑jun Ning Kai Pan Wei Xu Tao li Su‑Peng Lu Han Yi Rui‑Rui fan Chang‑Qing Feng Rong zhang Xiao‑Yang Sun Qi An Hao‑fan Bai Jiang‑bo Bai jie Bao Ping cao Qi‑Ping Chen Yong‑Hao Chen Zeng‑Qi Cui An‑Chuan fan fan‑Zhen Feng Min‑Hao Gu Chang‑Cai Han Zi‑jie Han Guo‑Zhu He Yong‑Cheng He Yang Hong Yi‑Wei Hu Han‑Xiong Huang Wei Jiang zhi‑jie Jiang Zheng‑Yao Jin ling Kang bo li Gong li Xiao li Yang li jie liu Rong liu Shu‑Bin liu Yi‑Na liu Guang‑Yuan Luan jie Ren zhi‑zhou Ren Xi‑Chao Ruan zhao‑hui Song Kang Sun zhi‑Xin Tan Sheng‑Da Tang Jin‑Cheng wang Peng‑Cheng wang zhao‑hui wang Zhong‑Wei Wen Xiao‑Guang Wu Xuan Wu Cong Xia Yong‑Ji Yu Guo‑hui zhang Hang‑Chang zhang lin‑Hao zhang Qi‑Wei zhang Xian‑Peng zhang Yu‑liang zhang Yue zhang zhi‑Yong zhang zhi‑Hao zhou Ke‑jun Zhu Chong Zou Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China State Key Laboratory of Particle Detection and Electronics Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Dongguan Songshan Lake Future School Dongguan 523808China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China North Night Vision Science and Technology(Nanjing)Research Institute Co.Ltd Nanjing 211106China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Institute of Modern Physics Fudan UniversityShanghai 200433China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China China Academy of Engineering Physics Institute of Nuclear Physics and ChemistryMianyang 621900China USTC archaeometry lab University of Science and Technology of ChinaHefei 230026China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China China Shipbuilding Trading Co. LtdBeijing 100044China

Neutron resonance imaging(NRI)has recently emerged as an appealing technique for neutron *** complexity surpasses that of conventional transmission imaging,as it requires a high demand for both a neutron source and ***,the progression of NRI technology has been sluggish since its inception in the 1980s,particularly considering the limited studies analyzing the neutron energy range above *** white neutron source(Back-n)at the China Spallation Neutron Source(CSNS)provides favorable beam conditions for the development of the NRI technique over a wide neutron energy range from eV to ***-sensitive microchannel plates(MCP)have emerged as a cutting-edge tool in the field of neutron detection owing to their high temporal and spatial resolutions,high detection efficiency,and low *** this study,we report the development of a 10B-doped MCP detector,along with its associated electronics,data processing system,and NRI experiments at the *** heavy elements such as gold,silver,tungsten,and indium can be easily identified in the transmission images by their characteristic resonance peaks in the 1–100 eV energy range;the more difficult medium-weight elements such as iron,copper,and aluminum with resonance peaks in the 1–100 keV energy range can also be *** particular,results in the neutron energy range of dozens of keV(Aluminum)are reported here for the first time.

关键词： Neutron resonance imaging 10B doped MCP detector White neutron source Sample nuclide identification

Data processing and data products from 2017 to 2019 campaign of astronomical site testing at Ali,Daocheng and Muztagh-ata

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Research in Astronomy and Astrophysics 2020年第6期20卷 109-130页

作者： Zi-Huang cao Jin-Xin Hao Lu Feng Hugh RAJones Jian li Jing Xu li-Yong liu Teng-Fei Song Jian-Feng wang Hua-lin Chen Yan-jie Xue Huang Shen Yong-Heng zhao zhao-Xiang Qi Jian-Rong Shi Yuan Tian Zheng wang Xia wang Jin-liang Hou Jin-Ming Bai Ji Yang Xu zhou Yong-Qiang Yao Jia Yin Ali Esamdin Guang-Xin Pu Peng Wei Chun-Hai Bai Guo-jie Feng Lu Ma Xuan zhang Yu liu Chong pei zhi-Xia Shen yun-ying Jiang Jian-Feng Tian Xian-Qun Zeng zhi-Gang Hou Xu Yang jun-bo zhang Shi-Long liao Dong-Wei fan yun-Fei Xu Jian-Ping Xiong Tai-Sheng Yan Xi zhang Chang-Hua li Yi-Han Tao Si-Cheng Yu zhi-Song cao Hong-Shuai wang National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Centre for Astrophysics University of HertfordshireHatfieldUK School of Journalism Communication University of ChinaBeijing 100024China Nanjing Institute of Astronomical Optics&Technology Chinese Academy of SciencesNanjing 210042China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China yunnan Observatories Chinese Academy of SciencesKunming 650216China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210033China Beijing Kaiyang Space Technology Co. LtdBeijing 100085China

Based on previous site testing and satellite cloud data,Ali,Daocheng and Muztagh-ata have been selected as candidate sites for the Large Optical/Infrared Telescope(LOT) in *** present the data collection,processing,management and quality analysis for our site testing based on using similar *** analyze meteorological data,seeing,background light,cloud and precipitable water vapor data from 2017 March 10 to 2019 March *** also investigated the relative usefulness of our all-sky camera data in comparison to that from the meteorological TERRA satellite data based on a night-by-night comparison of the correlation and consistency between *** find a 6% discrepancy arising from a wide range of factors.

关键词： LOT Site-selection-data processing

Study of the response of 10B-doped MCP to wide-energy range neutrons from eV to MeV

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Nuclear Science and Techniques 2024年第8期35卷 132-141页

作者： Qiang li li‑Jiao wang Xiang‑Biao Qiu Jing‑Wen li Wei Xu Tao li Ze‑Bin lin Chang‑jun Ning Yong‑Hao Chen Rui‑Rui fan Kang Sun Jing‑Yu Tang Rong zhang Han‑Tao Jing bo Mei Qi An Hao‑fan Bai Jiang‑bo Bai jie Bao Ping cao Qi‑Ping Chen Zhen Chen Zeng‑Qi Cui An‑Chuan fan Chang‑Qing Feng fan‑Zhen Feng Ke‑Qing Gao Min‑Hao Gu Chang‑Cai Han Zi‑jie Han Guo‑Zhu He Yong‑Cheng He Yang Hong Yi‑Wei Hu Han‑Xiong Huang Wei‑Hua Jia Hao‑Yu Jiang Wei Jiang zhi‑jie Jiang Zheng‑Yao Jin ling Kang bo li Chao li Gong li Jia‑Wen li Xiao li Yang li jie liu Rong liu Shu‑Bin liu Guang‑Yuan Luan Bin‑Bin Qi jie Ren zhi‑zhou Ren Xi‑Chao Ruan zhao‑hui Song zhi‑Xin Tan Sheng‑Da Tang Peng‑Cheng wang zhao‑hui wang Zhong‑Wei Wen Xiao‑Guang Wu Xuan Wu li‑Kun Xie Yi‑Wei Yang Han Yi Yong‑Ji Yu Guo‑hui zhang lin‑Hao zhang Mo‑Han zhang Qi‑Wei zhang Xian‑Peng zhang Yu‑liang zhang Yue zhang zhi‑Yong zhang Mao‑Yuan zhao Lu‑Ping zhou zhi‑Hao zhou Ke‑jun Zhu Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Dongguan Songshan Lake Future School Dongguan 523808China North Night Vision Science&Technology(Nanjing)Research Institute Co.Ltd. Nanjing 211106China Sino‑French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China USTC Archaeometry Lab University of Science and Technology of ChinaHefei 230026China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China

Neutron-sensitive microchannel plates(nMCPs)have applications in neutron detection,including energy spectrum measurements,neutron-induced cross sections,and neutron imaging.10B-doped MCPs(B-MCPs)have attracted significant attention owing to their potential for exhibiting a high neutron detection efficiency over a large neutron energy *** spatial and temporal resolutions are useful for neutron energy-resolved ***,their practical applications still face many technical *** this study,a B-MCP with 10 mol%10B was tested for its response to wide-energy neutrons from eV to MeV at the Back-n white neutron source at the China Spallation Neutron *** neutron detection efficiency was calibrated at 1 eV,which is approximately 300 times that of an ordinary MCP and indicates the success of 10 B *** factors that caused the reduction in the detection efficiency were simulated and *** neutron energy spectrum obtained using B-MCP was compared with that obtained by other measurement methods,and showed very good consistency for neutron energies below tens of *** response is more complicated at higher neutron energy,at which point the elastic and nonelastic reactions of all nuclides of B-MCP gradually become *** is beneficial for the detection of neutrons,as it compensates for the detection efficiency of B-MCP for high-energy neutrons.

关键词： Neutron radiation image 10B-doped MCP Neutron response Wide-energy range neutrons

Spatial-and spin-resolution ARPES and magnetism beamline at SSRF

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Nuclear Science and Techniques 2024年第8期35卷 23-37页

作者： fang‑Yuan Zhu jie‑Feng cao Xiang‑Yu Meng jun‑Qin li Rui Yu Ya‑Mei wang Shan Qiao bo zhao Ming‑Zhu zhang Zhong‑Kai liu Mei‑Xiao wang Yong wang Ren‑Zhong Tai Shanghai Synchrotron Radiation facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China ShanghaiTech Laboratory for Topological Physics School of Physical Science and TechnologyShanghai Tech UniversityShanghai 201210China University of Chinese Academy of Sciences Beijing 100049China

The BL07U beamline is a new extreme ultraviolet and soft X-ray beamline housed in the Shanghai Synchrotron Radiation facility. Beamlines are used in nano-resolved angle-resolved photoemission spectroscopy(nano-ARPES), spin-resolved angle-resolved photoemission spectroscopy(spin-ARPES), X-ray magnetic circular dichroism spectroscopy, and X-ray magnetic linear dichroism spectroscopy for certain scientific research. The BL07U beamline, which is based on a pair of elliptical polarized undulators and a variable-included-angle plane-grating monochromator, delivers circularly or linear polarized X-rays within the energy range of 50–2000 eV. The beamline features two branches: One dedicated to nano-ARPES,which has a minimum spot size of only ~ 200 nm, and another branch comprising spin-ARPES, a vector magnetic field, and superconductive magnetic end-station.

关键词： Soft X-ray beamline Nano-ARPES Spin-ARPES XMCD/XMLD

Measurement of the ^(232)Th(n,f)cross section in the 1-200 MeV range at the CSNS Back-n

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Nuclear Science and Techniques 2023年第8期34卷 142-153页

作者： zhi-zhou Ren Yi-Wei Yang Yong-Hao Chen Rong liu Bang-Jiao Ye jie Wen Hai-Rui Guo Zi-jie Han Qi-Ping Chen Zhong-Wei Wen Wei-li Sun Han Yi Xing-Yan liu Tao Ye Jiang-bo Bai Qi An jie Bao Yu Bao Ping cao Hao-Lei Chen Zhen Chen Zeng-Qi Cui Rui-Rui fan Chang-Qing Feng Ke-Qing Gao Xiao-Long Gao Min-Hao Gu Chang-Cai Han Guo-Zhu He Yong-Cheng He Yang Hong Yi-Wei Hu Han-Xiong Huang Xi-Ru Huang Hao-Yu Jiang Wei Jiang zhi-jie Jiang Han-Tao Jing ling Kang bo li Chao li Jia-Wen li Qiang li Xiao li Yang li jie liu Shu-Bin liu Ze Long Guang-Yuan Luan Chang-jun Ning Meng-Chen Niu Bin-Bin Qi jie Ren Xi-Chao Ruan zhao-hui Song Kang Sun zhi-Jia Sun zhi-Xin Tan Jing-Yu Tang Xin-Yi Tang Bin-Bin Tian li-Jiao wang Peng-Cheng wang zhao-hui wang Xiao-Guang Wu Xuan Wu li-Kun Xie Xiao-yun Yang li Yu Tao Yu Yong-Ji Yu Guo-hui zhang lin-Hao zhang Qi-Wei zhang Xian-Peng zhang Yu-liang zhang zhi-Yong zhang Lu-Ping zhou zhi-Hao zhou Ke-jun Zhu Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China Institute of Applied Physics and Computational Mathematics Beijing 100088China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230027China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijingChina Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China Department of Engineering and Applied Physics University of Science and Technology of ChinaHefei 230026China

The ^(232)Th(n,f)cross section is very important in basic nuclear physics and applications based on the Th/U fuel *** the time-of-flight method and a multi-cell fast-fission ionization chamber,a novel measurement of the^(232)Th(n,f)cross sec-tion relative to^(235)U in the 1–200 MeV range was performed at the China Spallation Neutron Source Back-n white neutron source(Back-n).The fission event-neutron energy spectra of^(232)Th and^(235)U fission cells were measured in the single-bunch *** 232Th/235U fission cross-sectional ratios were obtained,and the measurement uncertainties were 2.5–3.7%for energies in the 2–20 MeV range and 3.6–6.2%for energies in the 20–200 MeV ***^(232)Th(n,f)cross section was obtained by introducing the standard cross section of^(235)U(n,f).The results were compared with those of previous theoreti-cal calculations,measurements,and *** measured 232Th fission cross section agreed with the main evaluation results in terms of the experimental uncertainty,and 232Th fission resonances were observed in the 1–3 MeV *** present results provide^(232)Th(n,f)cross-sectional data for the evaluation and design of Th/U cycle nuclear systems.

关键词： 232Th(n f)cross section fast-fission ionization chamber Back-n white neutron source

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

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Nuclear Science and Techniques 2019年第9期30卷 73-82页

作者： Xing-Yan liu Yi-Wei Yang Rong liu jie Wen Zhong-Wei Wen Zi-jie Han zhi-zhou Ren Qi An Huai-Yong Bai jie Bao Ping cao Qi-Ping Chen Yong-Hao Chen Pin-Jing Cheng Zeng-Qi Cui Rui-Rui fan Chang-Qing Feng Min-Hao Gu Feng-Qin Guo Chang-Cai Han Guo-Zhu He Yong-Cheng He Yue-Feng He Han-Xiong Huang Wei-ling Huang Xi-Ru Huang Xiao-Lu Ji Xu-Yang Ji Hao-Yu Jiang Wei Jiang Han-Tao Jing ling Kang Ming-Tao Kang bo li Lun li Qiang li Xiao li Yang li Yang li Shu-Bin liu Guang-Yuan Luan ying-lin Ma Chang-jun Ning Bin-Bin Qi jie Ren Xi-Chao Ruan zhao-hui Song Hong Sun Xiao-Yang Sun zhi-Jia Sun zhi-Xin Tan Hong-Qing Tang Jing-Yu Tang Peng-Cheng wang Qi wang Tao-Feng wang Yan-Feng wang zhao-hui wang Zheng wang Qing-Biao Wu Xiao-Guang Wu Xuan Wu li-Kun Xie Han Yi li Yu Tao Yu Yong-Ji Yu Guo-hui zhang Jing zhang lin-Hao zhang li-ying zhang Qing-Min zhang Qi-Wei zhang Xian-Peng zhang Yu-liang zhang zhi-Yong zhang ying-Tan zhao liang zhou Zu-ying zhou Dan-Yang Zhu Ke-jun Zhu Peng Zhu Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics State Key Laboratory of Particle Detection and Electronics Chinese Academy of Sciences(CAS) Department of Modern Physics University of Science and Technology of China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking University Key Laboratory of Nuclear Data China Institute of Atomic Energy Institute of High Energy Physics Chinese Academy of Sciences(CAS) Spallation Neutron Source Science Center University of South China Northwest Institute of Nuclear Technology Department of Engineering and Applied Physics University of Science and Technology of China Beihang University Xi’an Jiaotong University

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 1 eV to 20 MeV 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 235U and 238U is employed as the neutron detector. The diameter and thickness of the natural graphite sample are 70 mm and 40 mm, 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 1–20 MeV. It is determined that the results for the neutron total cross section of carbon obtained using ^235U cells are in good agreement with the results obtained using 238U cells within limits of statistical uncertainty. Moreover, the measured total cross sections show good agreement with the broadening evaluated data.

关键词： CSNS Back-n white neutron source NTOX Neutron total cross section Carbon Multilayer fast fission chamber