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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

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

Effectiveness and Safety of Qishen Yiqi Dripping Pill in Patients with Acute Coronary Syndrome after Percutaneous Coronary Intervention:3-Year Results from a Multicentre Cohort Study

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Chinese Journal of Integrative Medicine 2024年第10期30卷 877-885页

作者： bai Rui-na GU feng CHE Qian-zi zhang Xuan CAI Ya-jie xi Rui-xi ZHAO Yang GUO Ming DONG Guo-ju GAO zhu-ye FU Chang-geng wang Pei-li DU jian-peng zhang Da-wu DUAN Wen-hui li li-zhi YANG Qiao-ning SHI Da-zhuo Department of Cardiovascular Xiyuan HospitalChina Academy of Chinese Medical SciencesBeijing100091China National Clinical Research Center for Chinese Medicine Cardiology Beijing100091China Department of Evidence-Based Medicine Basic Research Laboratory Institute of Basic Research in Clinical MedicineChina Academy of Chinese Medical SciencesBeijing100700China Department of Traditional Chinese Medicine Beijing Shangdi HospitalBeijing100193China National Medical Products Administration Key Laboratory for Clinical Research and Evaluation of Traditional Chinese MedicineBeijing100091China

Objectives:To evaluate the effectiveness and safety of Qishen Yiqi Dripping Pill(QSYQ)in patients with acute coronary syndrome(ACS)after percutaneous coronary intervention(PCI).Methods:This multicentre prospective cohort study was conducted at 40 centers in *** with ACS after PCI entered either the QSYQ or Western medicine(WM)groups naturally based on whether they had received QSYQ before *** group received QSYQ(0.52 g,3 times a day for 12 months)in addition to *** primary endpoint included cardiac death,non-fatal myocardial infarction,and urgent *** secondary endpoint included rehospitalization due to ACS,heart failure,stroke,and other thrombotic *** of life was assessed by the Seattle Angina Questionnaire(SAQ).Results:A total of 936 patients completed follow-up of the primary endpoint from February 2012 to December ***,487 patients received QSYQ and *** a median follow-up of 566 days(inter quartile range,IQR,517–602),the primary endpoint occurred in 46(9.45%)and 65(14.48%)patients in QSYQ and WM groups respectively[adjusted hazard ratio(HR)0.60,95%confidence interval(CI)0.41–0.90;P=0.013].The secondary endpoint occurred in 61(12.53%)and 74(16.48%)patients in QSYQ and WM groups,respectively(adjusted HR 0.76,95%CI 0.53–1.09;P=0.136).In sensitivity analysis,the results still demonstrated that WM combined with QSYQ reduced the risk of the primary endpoint(HR 0.67,95%CI 0.46–0.98;P=0.039).Moreover,QSYQ improved the disease perception domain of the SAQ(P<0.05).Conclusions:In patients with ACS after PCI,QSYQ combined with WM reduced the incidence of the primary *** findings provide a promising option for managing ACS after PCI and suggest the potential treatment for reducing the risk of primary endpoint included cardiac death,non-fatal myocardial infarction,and urgent revascularization through intermittent administration of QSYQ.(Registration *** CTR-OOC-14005552).

关键词： Qishen Yiqi Dripping Pill acute coronary syndrome percutaneous coronary intervention primary and secondary endpoint

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

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

Nondestructive technique for identifying nuclides using neutron resonance transmission analysis at CSNS Back-n

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Nuclear Science and Techniques 2024年第1期35卷 178-187页

作者： Sheng-Da Tang yong-Hao Chen Jing-Yu Tang Rui-Rui Fan Qiang li Gong li Dong liu Zheng-Yao Jin xing-zhu Cui Tian-xiang Chen Yi-Wei Yang Rong liu Han Yi Yang li Zhen Yang 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 ling Kang bo li Chao li Jia-Wen li xiao li Jie liu Shu-Bin liu Guang-Yuan Luan Chang-Jun Ning Bin-Bin Qi Jie Ren zhi-Zhou Ren xi-Chao Ruan Zhao-hui Song Kang Sun zhi-xin Tan li-Jiao wang Peng-Cheng wang Zhao-hui wang Zhong-Wei Wen xiao-Guang wu Xuan wu li-Kun xie 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 Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China Institute of High-Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China USTC Archaeometry Laboratory 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 State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China

Nondestructive and noninvasive neutron assays are essential applications of neutron *** resonance transmission analysis(NRTA)is a powerful nondestructive method for investigating the elemental composition of an *** back-streaming neutron line(Back-n)is a newly built time-of-flight facility at the China Spallation Neutron Source(CSNS)that provides neutrons in the eV to 300 MeV range.A feasibility study of the NRTA method for nuclide identification was conducted at the CSNS Back-n via two test *** results demonstrate that it is feasible to identify different elements and isotopes in samples using the NRTA method at *** study reveals its potential future applications.

关键词： CSNS White neutron beam NRTA Nuclide identification Nondestructive method

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

Back-n white neutron source at CSNS and its applications

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Nuclear Science and Techniques 2021年第1期32卷 95-104页

作者： Jing-Yu Tang Qi An jiang-bo bai Jie bao Yu bao Ping Cao Hao-Lei Chen Qi-Ping Chen yong-Hao Chen Zhen Chen Zeng-Qi Cui Rui-Rui Fan Chang-qing feng Ke-qing Gao xiao-Long Gao Min-Hao Gu Chang-Cai Han Zi-Jie 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 Rong liu Shu-Bin liu xing-Yan liu Ze Long Guang-Yuan Luan Chang-Jun Ning Meng-Chen Niu Bin-Bin Qi Jie Ren zhi-Zhou Ren xi-Chao Ruan Zhao-hui Song Kang Sun zhi-Jia Sun zhi-xin Tan xin-Yi Tang Bin-Bin Tian li-Jiao wang Peng-Cheng wang Zhao-hui wang Zhong-Wei Wen xiao-Guang wu Xuan wu li-Kun xie xiao-Yun Yang Yi-Wei Yang Han Yi 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 无 State Key Laboratory of Particle Detection and Electronics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China 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 State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China The CSNS Back-n Collaboration

Back-streaming neutrons from the spallation target of the China Spallation Neutron Source(CSNS)that emit through the incoming proton channel were exploited to build a white neutron beam facility(the so-called Back-n white neutron source),which was completed in March *** Back-n neutron beam is very intense,at approximately 29107 n/cm2/s at 55 m from the target,and has a nominal proton beam with a power of 100 kW in the CSNS-I phase and a kinetic energy of 1.6 GeV and a thick tungsten target in multiple slices with modest moderation from the cooling water through the *** addition,the excellent energy spectrum spanning from 0.5 eV to 200 MeV,and a good time resolution related tothe time-of-flight measurements make it a typical white neutron source for nuclear data measurements;its overall performance is among that of the best white neutron sources in the *** with advanced spectrometers,detectors,and application utilities,the Back-n facility can serve wide applications,with a focus on neutron-induced cross-sectional *** article presents an overview of the neutron beam characteristics,the experimental setups,and the ongoing applications at Backn.

关键词： White neutron source Nuclear data measurements Experimental setups Neutron applications

Frontiers in high entropy alloys and high entropy functional materials

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Rare Metals 2024年第10期43卷 4639-4776页

作者： Wen-Tao zhang Xue-Qian wang feng-Qi zhang xiao-Ya Cui Bing-Bing Fan Jia-Ming Guo zhi-Min Guo Rui Huang Wen Huang Xu-bo li Meng-Ru li Yan Ma zhi-Hua Shen yong-Gang Sun De-zhuang wang Fei-Yang wang li-Qiang wang Nan wang Tian-li wang Wei wang xiao-Yang wang Yi-Han wang Fu-Jie Yu Yu-Zhen Yin ling-Kun zhang Yi zhang jian-Yang zhang Qi Zhao Yu-Ping Zhao xin-Dong zhu Yasir Sohail Ya-Nan Chen Tao feng Qi-Long Gao Hai-Yan He yong-jiang Huang Zeng-bao Jiao Hua Ji Yao jiang Qiang li xiao-Ming li Wei-Bing liao Huai-Jun lin hui liu Qi liu qing-feng liu Wei-Di liu xiong-Jun liu Yang Lu Yi-Ping Lu Wen Ma Xue-Fei Miao Jie Pan qing wang hong-hui wu Yuan wu Tao Yang Wei-Ming Yang Qian Yu Jin-Yu zhang zhi-Gang Chen liang Mao Yang Ren bao-Long Shen Xun-li wang Zhe Jia He zhu Zhen-Duo wu Si Lan School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China jiangsu Key Laboratory for Advanced Metallic Materials School of Materials Science and EngineeringSoutheast UniversityNanjing 211189China Department of Physics City University of Hong KongHongKong 999077China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China Department of Mechanical Engineering Research Institute for Advanced ManufacturingThe Hong Kong Polytechnic UniversityHong Kong 100872China Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of Solidification Control and Digital Preparation Technology(liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Institute of Advanced Wear&Corrosion Resistance and Functional Materials Jinan UniversityGuangzhou 510632China School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou 221116China School of Physical Sciences Great Bay UniversityDongguan 523000China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China Beijing Advanced Innovation Center for Materials Genome Engineering Research Institute for Carbon NeutralityUniversity of Science and Technology BeijingBeijing 100083China Department of Mechanical Engineering The University of Hong KongHong Kong 999077China School of Computing Macquarie UniversitySydney 2113Australia Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China State Key Laborato

Owing to their exceptional properties,high-entropy alloys(HEAs)and high-entropy materials have emerged as promising research areas and shown diverse ***,the recent advances in the field are comprehensively reviewed,organized into five *** first section introduces the background of HEAs,covering their definition,significance,application prospects,basic properties,design principles,and *** subsequent section focuses on cutting-edge high-entropy structural materials,highlighting developments such as nanostructured alloys,grain boundary engineering,eutectic systems,cryogenic alloys,thin films,micro-nano-lattice structures,additive manufacturing,high entropy metallic glasses,nano-precipitate strengthened alloys,composition modulation,alloy fibers,and refractory *** the following section,the emphasis shifts to functional materials,exploring HEAs as catalysts,magneto-caloric materials,corrosion-resistant alloys,radiation-resistant alloys,hydrogen storage systems,and materials for ***,the review encompasses functional high-entropy materials outside the realm of alloys,including thermoelectric,quantum dots,nanooxide catalysts,energy storage materials,negative thermal expansion ceramics,and high-entropy wave absorption *** paper concludes with an outlook,discussing future directions and potential growth areas in the *** this comprehensive review,researchers,engineers,and scientists may gain valuable insights into the recent progress and opportunities for further exploration in the exciting domains of high-entropy alloys and functional materials.

关键词： High entropy alloys Cutting-edge structural materials Cutting-edgefunctional materials