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Einstein Probe discovery of EP240408a: A peculiar X-ray transient with an intermediate timescale

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 222-240页

作者： Wenda Zhang weimin Yuan Zhixing Ling Yong chen Nanda Rea Arne Rau Zhiming Cai Huaqing cheng Francesco Coti Zelati Lixin dai Jingwei Hu Shumei Jia Chichuan Jin Dongyue Li Paul O’Brien Rongfeng Shen Xinwen Shu Shengli sun Xiaojin sun Xiaofeng wang Lei Yang Bing Zhang chen Zhang Shuang-Nan Zhang Yonghe Zhang jie An david Buckley Alexis Coleiro Bertrand Cordier Liming Dou Rob Eyles-Ferris Zhou Fan Hua Feng Shaoyu Fu Johan P.U.Fynbo Lluis Galbany Saurabh W.Jha Shuaiqing Jiang Albert Kong Erik Kuulkers weihua Lei Wenxiong Li Bifang liu Mingjun liu Xing liu Yuan liu Zhu liu Chandreyee Maitra Alessio Marino Itumeleng Monageng Kirpal Nandra Jeremy Sanders Roberto Soria Lian Tao Junfeng wang Song wang Tinggui wang zhongxiang wang Qingwen wu Xuefeng wu Dong Xu Yanjun Xu Suijian Xue Yongquan Xue Zijian Zhang Zipei Zhu Hu Zou Congying Bao Fansheng chen Houlei chen Tianxiang chen wei chen Yehai chen Yifan chen chenzhou Cui weiwei Cui Yanfeng dai Dongwei Fan Ju Guan dawei Han Dongjie Hou Haibo Hu Maohai Huang Jia Huo Zhenqing Jia Bowen Jiang Ge Jin chengkui Li Junfei Li Longhui Li Maoshun Li wei Li Zhengda Li Tianying Lian Congzhan liu Heyang liu Huaqiu liu Fangjun lu Laidan luo Jia Ma Xuan Mao Haiwu Pan Xin Pan Liming Song hui sun Yunyin Tan Qingjun Tang Yihan Tao Hao wang Juan wang Lei wang Wenxin wang Yilong wang Yusa wang Qinyu wu Haitao Xu Jingjing Xu Xinpeng Xu Yunfei Xu zhao Xu Changbin Xue Yulong Xue Ailiang Yan Haonan Yang Xiongtao Yang Yanji Yang Juan Zhang Mo Zhang Wenjie Zhang Zhen Zhang Zhen Zhang Ziliang Zhang Donghua zhao Haisheng zhao Xiaofan zhao Zijian zhao Hongyan Zhou Yilin Zhou Yuxuan Zhu Zhencai Zhu National Astronomical Observatories Chinese Academy of Sciences School of Astronomy and Space Sciences University of Chinese Academy of Sciences Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Institute of Space Sciences (ICE) CSIC Institut d’Estudis Espacials de Catalunya (IEEC) Max Planck Institute for Extraterrestrial Physics Innovation Academy for Microsatellites Chinese Academy of Sciences Department of Physics University of Hong Kong School of Physics and Astronomy University of Leicester School of Physics and Astronomy sun Yat-sen University Department of Physics Anhui Normal University Shanghai Institute of Technical Physics Chinese Academy of Sciences Physics Department Tsinghua University Nevada Center for Astrophysics University of Nevada Las Vegas Department of Physics and Astronomy University of Nevada Las Vegas South African Astronomical Observatory Department of Astronomy University of Cape Town Department of Physics University of the Free State Université Paris Cité CNRS Astroparticule et Cosmologie Université Paris Cité CEA Paris-Saclay IRFU/dap-AIM Department of Astronomy Guangzhou University Cosmic dawn Center (daWN) Niels Bohr Institute University of Copenhagen Department of Physics and Astronomy Rutgers the State University of New Jersey Institute for Cosmic Ray Research The University of Tokyo ESA/ESTEC Department of Astronomy School of Physics Huazhong University of Science and Technology INAF-Osservatorio Astrofisico di Torino Sydney Institute for Astronomy School of Physics The University of Sydney Department of Astronomy Xiamen University Institute for Frontiers in Astronomy and Astrophysics Beijing Normal University Department of Astronomy University of Science and Technology School of Astronomy and Space Sciences University of Science and Technology of China Institute of Deep Space Sciences Deep Space Exploration Laboratory Department of Astronomy School of Physics and Astronomy Yunnan University Shanghai Astronomical Observatory Chi

We report the discovery of a peculiar X-ray transient,EP240408a,by Einstein Probe （EP） and follow-up studies made with EP,Swift,NICER,GROND,ATCA and other ground-based multiwavelength *** new transient was first detected with Wide-field X-ray Telescope （WXT） on board EP on April 8th,2024,manifested in an intense yet brief X-ray flare lasting for *** flare reached a peak flux of 3.9×10-9erg cm-2s-1in 0.5-4 ke V,～300 times brighter than the underlying X-ray emission detected throughout the *** and more precise follow-up observations by EP/FXT,Swift and NICER confirmed the finding of this new *** X-ray spectrum is non-thermal in 0.5-10 ke V,with a power-law photon index varying *** X-ray light curve shows a plateau lasting for ～4 d,followed by a steep decay till becoming undetectable ～10 d after the initial *** on its temporal property and constraints from previous EP observations,an unusual timescale in the range of 7-23 d is found for EP240408a,which is intermediate between the commonly found fast and long-term *** counterparts have been found in optical and near-infrared,with the earliest observation at 17 h after the initial X-ray detection,suggestive of intrinsically weak emission in these *** demonstrate that the remarkable properties of EP240408a are inconsistent with any of the transient types known so far,by comparison with,in particular,jetted tidal disruption events,gamma-ray bursts,X-ray binaries and fast blue optical *** nature of EP240408a thus remains an *** suggest that EP240408a may represent a new type of transients with intermediate timescales of the order of～10 *** detection and follow-ups of more of such objects are essential for revealing their origin.

关键词： X-ray transients ${\bm~{Einstein~~Probe}}$

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

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

Development and calibration of the Moon-based EUV camera for Chang'e-3

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Research in Astronomy and Astrophysics 2014年第12期14卷 1654-1663页

作者： Bo chen Ke-Fei Song zhao-hui Li Qing-Wen wu Qi-Liang Ni Xiao-Dong wang Jin-Jiang Xie Shi-jie liu Ling-Ping He Fei He Xiao-Guang wang Bin chen Hong-Ji Zhang Xiao-Dong wang Hai-Feng wang Xin Zheng Shu-Lin E Yong-cheng wang Tao Yu Liang sun Jin-Ling wang Zhi wang Liang Yang Qing-Long Hu Ke Qiao zhong-Su wang Xian-wei Yang Hai-Ming Bao Wen-Guang liu Zhe Li Ya chen Yang Gao hui sun Wen-Chang chen Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences

The process of development and calibration for the first Moon-based ex- treme ultraviolet （EUV） camera to observe Earth＇s plasmasphere is introduced and the design, test and calibration results are presented. The EUV camera is composed of a multilayer film mirror, a thin film filter, a photon-counting imaging detector, a mech- anism that can adjust the direction in two dimensions, a protective cover, an electronic unit and a thermal control unit. The center wavelength of the EUV camera is 30.2 nm with a bandwidth of 4.6nm. The field of view is 14.7° with an angular resolution of 0.08°, and the sensitivity of the camera is 0.11 count s-1 Rayleigh-1. The geomet- ric calibration, the absolute photometric calibration and the relative photometric cal- ibration are carried out under different temperatures before launch to obtain a matrix that can correct geometric distortion and a matrix for relative photometric correction, which are used for in-orbit correction of the images to ensure their accuracy.

关键词： Chang'e-3 -- EUV camera: development: calibration -- Earth's plas-masphere -- lunar exploration

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

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

CD147-spike protein is a novel route for SARS-CoV-2 infection to host cells

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Signal Transduction and Targeted Therapy 2021年第1期6卷 95-104页

作者： Ke wang wei chen Zheng Zhang Yongqiang Deng Jian-Qi Lian Peng Du Ding wei Yang Zhang Xiu-Xuan sun Li Gong Xu Yang Lei He Lei Zhang Zhiwei Yang jie-jie Geng Ruo chen Hai Zhang Bin wang Yu-Meng Zhu Gang Nan Jian-Li Jiang Ling Li Jiao wu Peng Lin Wan Huang Liangzhi Xie zhao-hui Zheng Kui Zhang Jin-Lin Miao Hong-Yong Cui Min Huang Jun Zhang Ling Fu Xiang-Min Yang zhongpeng zhao Shihui sun Hongjing Gu Zhe wang Chun-Fu wang Yacheng lu Ying-Ying liu Qing-Yi wang huijie Bian Ping ZhuZhi-Nan chen National Translational Science Center for Molecular Medicine&Department of Cell Biology Fourth Military Medical UniversityXi’an 710032China Beijing Institute of Biotechnology Beijing 100071China State Key Laboratory of Pathogen and Biosecurity Beijing Institute of Microbiology and EpidemiologyBeijing 100071China Tangdu Hospital Fourth Military Medical UniversityXi’an 710038China MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Xi’an Jiaotong UniversityXi’an 710049China Sino Biological Inc. Beijing 100176China Department of Clinical Immunology Xijing HospitalFourth Military Medical UniversityXi’an 710032China School of Basic Medicine Fourth Military Medical UniversityXi’an 710032China

In face of the everlasting battle toward COVID-19 and the rapid evolution of SARS-CoV-2,no specific and effective drugs for treating this disease have been reported until ***-converting enzyme 2(ACE2),a receptor of SARS-CoV-2,mediates the virus infection by binding to spike *** ACE2 is expressed in the lung,kidney,and intestine,its expressing levels are rather low,especially in the *** the great infectivity of COVID-19,we speculate that SARS-CoV-2 may depend on other routes to facilitate its ***,we first discover an interaction between host cell receptor CD147 and SARS-CoV-2 spike *** loss of CD147 or blocking CD147 in Vero E6 and BEAS-2B cell lines by anti-CD147 antibody,Meplazumab,inhibits SARSCoV-2 *** of human CD147 allows virus entry into non-susceptible BHK-21 cells,which can be neutralized by CD147 extracellular *** loads are detectable in the lungs of human CD147(hCD147)mice infected with SARS-CoV-2,but not in those of virus-infected wild type ***,virions are observed in lymphocytes of lung tissue from a COVID-19 *** T cells with a property of ACE2 natural deficiency can be infected with SARS-CoV-2 pseudovirus in a dosedependent manner,which is specifically inhibited by ***,CD147 mediates virus entering host cells by ***,our study reveals a novel virus entry route,CD147-spike protein,which provides an important target for developing specific and effective drug against COVID-19.

关键词： ACE2 CD147 intestine

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