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Frontiers in high entropy alloys and high entropy functional materials

Rare Metals 2024年第10期43卷 4639-4776页

作者： Wen-Tao Zhang Wen Huang Fu-Jie Yu Qi Zhao Xin-Dong Zhu Tao Feng Yao jiang Xiao-Ming Li Xue-Fei Miao He Zhu Si Lan Xue-Qian wang Bao-Long Shen Zhe jia Feng-Qi Zhang Wei wang Qi Liu Yang Ren Xun-Li wang Xiao-Ya Cui Xiao-Yang wang Ya-Nan chen Bing-Bing Fan Meng-Ru Li Qi-Long Gao jia-Ming Guo Zeng-Bao jiao Zhi-Min Guo Yu-Ping Zhao Qian Yu Rui Huang Ling-Kun Zhang Yi-Ping Lu Xu-Bo Li Huai-Jun Lin Yan Ma Wei-Ming Yang Zhi-Hua Shen Hai-Yan He yong-Gang Sun yong-jiang Huang De-Zhuang wang Qing-Feng Liu Fei-Yang wang Hui Liu Hong-Hui Wu Li-Qiang wang Yang Lu Nan wang Tian-Li wang Wei-Bing Liao Yi-Han wang Yuan Wu Yu-Zhen Yin Jie Pan Yi Zhang Qing wang jian-Yang Zhang Tao Yang Yasir Sohail Jin-Yu Zhang Hua Ji Qiang Li Wei-Di Liu Zhi-Gang chen Xiong-Jun Liu Wen Ma Liang Mao Zhen-Duo Wu School of Materials Science and Engineering Nanjing University of Science and Technology jiangsu key {2. for Advanced Metallic Materials School of Materials Science and Engineering Southeast University Department of physics City University of Hong Kong School of Materials Science and Engineering Tianjin University School of physics and Microelectronics Zhengzhou University Department of Mechanical Engineering Research Institute for Advanced Manufacturing The Hong Kong Polytechnic University Center of Electron Microscopy and State key laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University key laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology institute of Advanced Wear & Corrosion Resistance and Functional Materials Jinan University School of Mechanics and Civil Engineering China University of Mining and Technology School of Physical sciences Great Bay University School of Materials Science andEngineering Harbin Institute of Technology State key laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University beijing Advanced Innovation Center for Materials Genome Engineering Research Institute for Carbon Neutrality University of Science and Technology Beijing Department of Mechanical Engineering The University of Hong Kong School of Computing Macquarie University key laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University State key laboratory for Advanced Metals and Materials University of Science and Technology Beijing State key laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology institute of materials Shanghai University Department of Materials Science and Engineering C

Owing to their exceptional properties, high-entropy alloys(HEAs) and high-entropy materials have emerged as promising research areas and shown diverse applications. Here,the recent advances in the field are comprehensively reviewed,organized into five sections. The first section introduces the background of HEAs, covering their definition, significance,application prospects, basic properties, design principles, and microstructure. The 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 systems. In 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 biomedicine. Additionally, 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 materials. The paper concludes with an outlook, discussing future directions and potential growth areas in the field. Through 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： Cutting-edge structural materials Cutting-edgefunctional materials High entropy alloys

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Identification of deuterons at BESIII

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chinese physics C 2024年第1期48卷 1-6页

作者：王维郑波秦佳佳王至勇 University of South china Hengyang 421001China key laboratory of Advanced Nuclear Energy Design and Safety Ministry EducationHengyang 421001China institute of High Energy physics Chinese Academy of SciencesBeijing 100049China University of chinese academy of sciences Beijing 100049China

The identification of deuterons with momenta in the range of 0.52.0.72.GeV/c is studied with specific ionization energy loss information using a data sample collected by the BESIII detector at center-of-mass energies between 4.009 and 4.946 *** deuteron samples are selected using time of flight *** all data samples,the deuteron identification efficiencies are higher than 95%,with a maximum difference of%between data and Monte Carlo *** verifies the effectiveness of the deuteron identification method based on specific ionization energy loss and provides valuable information for future studies on processes involving deuterons in the final state at BESIII.

关键词： specific ionization energy loss BESIII identification of deuterons particle identification efficiency

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Optimized online filter stack spectrometer for ultrashort X-ray pulses

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Nuclear Science and Techniques 2024年第5期35卷 85-98页

作者： jia-Xing Wen Ge Ma Ming-Hai Yu Yu-Chi Wu yong-Hong Yan Shao-Yi {2. Huai-Zhong Gao Lu-Shan {2. Yu-Gang Zhou Qiang Li Yue Yang Fang Tan Xiao-Hui Zhang Jie Zhang Wen-Bo Mo Jing-Qin Su Wei-Min Zhou Yu-Qiu Gu Ming Zeng Zong-Qing Zhao Science and Technology on Plasma physics laboratory Laser Fusion Research CenterCAEPMianyang 621900China Department of Engineering physics Tsinghua UniversityBeijing 100084China key laboratory of {2. and Radiation Imaging(Tsinghua University) Ministry of EducationBeijing 100084China School of Information Engineering Southwest University of Science and TechnologyMianyang 621010China

Currently,with the advent of high-repetition-rate laser-plasma experiments,the demand for online diagnosis for the X-ray spectrum is increasing because the laser-plasma-generated X-ray spectrum is very important for characterizing electron dynamics and *** this study,scintillators and silicon PIN(P-type–intrinsic-N-type semiconductor)diodes were used to construct a wideband online filter stack *** X-ray sensor and filter arrangement was optimized using a genetic algorithm to minimize the condition number of the response ***,the unfolding error was significantly reduced based on numerical *** detector responses were quantitatively calibrated by irradiating the scintillator and PIN diode with various nuclides and comparing the measuredγ-ray peaks.A prototype 15-channel spectrometer was developed by integrating an X-ray detector with front-and back-end *** prototype spectrometer could record X-ray pulse signals at a repetition rate of 1 ***,an optimized spectrometer was employed to record the real-time spectra of laser-driven bremsstrahlung *** optimized spectrometer offers a compact solution for spectrum diagnostics of ultrashort X-ray pulses,exhibiting improved accuracy in terms of spectrum measurements and repetition rates,and could be widely used in next-generation high-repetition-rate high-power laser facilities.

关键词： Filter stack spectrometer Laser plasma diagnostics X-ray diagnostics Scintillator PIN diode

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Direct measurement of the break-out ^(19)F(p,γ)^(2.)Ne reaction in the china Jinping underground laboratory(CJPL)

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Nuclear Science and Techniques 2024年第8期35卷 142-152页

作者： Yin‑Ji chen Hao Zhang Li‑yong Zhang {2.n‑Jun He Richard James deBoer Michael Wiescher Alexander Heger David Kahl Jun Su Daniel Odell Xin‑Yue Li {2.n‑Guo wang Long Zhang Fu‑Qiang Cao Zhi‑cheng Zhang Xin‑Zhi {2.ng Luo‑Huan wang Zi‑Ming Li Lu‑Yang Song Liang‑Ting Sun Qi Wu {2.‑Qing Li Bao‑Qun Cui Li‑Hua chen Rui‑Gang Ma Er‑Tao Li Gang Lian Yao‑De Sheng Zhi‑Hong Li Bing Guo Wei‑Ping Liu key laboratory of Beam Technology of the Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Department of physics and Astronomy The Joint Institute for Nuclear AstrophysicsUniversity of Notre DameNotre DameIN 46556USA School of physics and Astronomy Monash UniversityClaytonVIC 3800Australia Facility for Rare Isotope Beams Michigan State UniversityEast LansingMI 48824USA institute of Nuclear and particle {2. and Department of {2. and Astronomy Ohio UniversityAthensOH 45701USA institute of Modern physics Chinese Academy of SciencesLanzhou 730000China china institute of Atomic Energy Beijing 102413China College of physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China College of Science Southern University of Science and TechnologyShenzhen 518055China institute of Radiation Technology Beijing Academy of Science and TechnologyBeijing 100875China key laboratory of Nuclear {2. and Ion‑Beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Mathematics and physics Handan UniversityHandan 056005China

Calcium production and the stellar evolution of first-generation stars remain fascinating mysteries in *** one possible nucleosynthesis scenario,break-out from the hot carbon–nitrogen–oxygen(HCNO)cycle was thought to be the source of the calcium observed in these oldest ***,according to the stellar modeling,a nearly tenfold increase in the thermonuclear rate ratio of the break-out ^(19)F(p,γ)^(2.) Ne reaction with respect to the competing ^(19)F(p,α)^(16) O back-processing reaction is required to reproduce the observed calcium *** performed a direct measurement of this break-out reaction at the china Jinping underground *** measurement was performed down to the low-energy limit of E_(c.m.)=186 keV in the center-of-mass *** key resonance was observed at 2.5.2.keV for the first *** a temperature of approximately 0.1 GK,this new resonance enhanced the thermonuclear ^(19)F(p,γ)^(2.) Ne rate by up to a factor of≈7.4,compared with the previously recommended NACRE *** is of particular interest to the study of the evolution of the first stars and implies a stronger breakdown in their“warm”CNO cycle through the ^(19)F(p,γ)^(2.) Ne reaction than previously *** break-out resulted in the production of the calcium observed in the oldest stars,enhancing our understanding of the evolution of the first stars.

关键词： Nuclear astrophysics First stars Abundance of calcium Reaction cross section Reaction rate china Jinping underground laboratory(CJPL) JUNA

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The effect of the carbon components on the performance of carbonbased transition metal electrocatalysts for the hydrogen evolution reaction

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新型炭材料（中英文） 2024年第5期39卷 946-972页

作者： LI Guo-hua wang Jing REN Jin-tian LIU Hong-chen QIAN Jin-xiu chenG {3.-ting ZHAO Mei-tong YANG Fan LI yong-feng State key laboratory of Heavy Oil Processing China University of Petroleum(Beijing)Beijing 102249China

The hydrogen evolution reaction(HER)is a promising way to produce hydrogen,and the use of non-precious metals with an excellent electrochemical performance is vital for ***-based transition metal catalysts have high activity and stability,which are important in reducing the cost of hydrogen production and promoting the development of the hydrogen production ***,there is a lack of discussion regarding the effect of carbon components on the performance of these *** review of the literature discusses the choice of the carbon components in these catalysts and their impact on catalytic performance,including electronic structure control by heteroatom doping,morphology adjustment,and the influence of self-supporting *** not only analyzes the progress in HER,but also provides guidance for synthesizing high-performance carbon-based transition metal catalysts.

关键词： Carbon-based transition metal catalysts Heteroatom doping Morphology adjustment Self-supporting materials Hydrogen evolution reaction

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Scintillation Arc from FRB 2.2.0912.

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Science china(physics,Mechanics & Astronomy) 2024年第1期67卷 134-142页

作者： Zi-Wei Wu Robert AMain Wei-Wei Zhu Bing Zhang Peng jiang jia-Rui Niu Jin-Lin Han Di Li Ke-jia Lee Dong-Zi Li Yuan-Pei Yang Fa-Yin {3. Rui Luo Pei {3. chen-Hui Niu Heng Xu Bo-Jun {3. Wei-Yang {3. yong-Kun Zhang Yi Feng De-jiang Zhou yong-Hua Xu Can-Min Deng Yu-Hao Zhu National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Max-Planck-Institut für Radioastronomie Bonn 53121Germany institute for Frontier in Astronomy and astrophysics Beijing Normal UniversityBeijing 102206China Nevada Center for astrophysics and Department of physics and Astronomy University of NevadaLas VegasNV 89154USA CAS key laboratory of FAST National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astronomy University of Chinese Academy of SciencesBeijing 100049China NAOC-UKZN Computational astrophysics Centre University of KwaZulu-NatalDurban 4000South Africa Department of Astronomy Peking UniversityBeijing 100871China Kavli institute for Astronomy and astrophysics Peking UniversityBeijing 100871China Cahill Center for Astronomy and astrophysics California Institute of TechnologyPasadena 91125USA South-Western institute For Astronomy Research Yunnan UniversityKunming 650504China School of Astronomy and Space Science Nanjing UniversityNanjing 210093China key laboratory of Modern Astronomy and {2.(Nanjing University) Ministry of EducationNanjing 210023China CSIRO Space and Astronomy Epping 1710Australia Department of Astronomy School of Physics and Materials ScienceGuangzhou UniversityGuangzhou 510006China Research Center for Intelligent Computing Platforms Zhejiang LaboratoryHangzhou 311100China Yunnan Observatories Chinese Academy of SciencesKunming 650011China Guangxi key laboratory for Relativistic {2. Department of PhysicsGuangxi UniversityNanning 530004China

We present the interstellar scintillation analysis of fast radio burst(FRB)2.2.0912. during its extremely active episode in 2.2.using data from the Five-hundred-meter Aperture Spherical Radio Telescope(FAST).We detect a scintillation arc in the FRB’s secondary spectrum,which describes the power in terms of the scattered FRB signals’time delay and Doppler *** arc indicates that the scintillation is caused by a highly localized *** analysis favors a Milky Way origin of the ionized interstellar medium(IISM)for the localized scattering medium but cannot rule out a host galaxy *** present our method for detecting the scintillation arc,which can be applied generally to sources with irregularly spaced bursts or *** methods could help shed light on the complex interstellar environment surrounding the FRBs and in our Galaxy.

关键词： fast radio burst scintillation FRB 2.2.0912.

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The First Isochronous Mass Measurements at CSRe

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原子核物理评论 2009年第S1期26卷 185-189页

作者： TU Xiao-lin1,2. XU Hu-shan1, , wang Meng1, XIA jia-wen1, MAO Rui-shi1, YUAN You-jin1, HU Zheng-guo1, LIU {2.1, ZHANG Hong-bin1, ZANG {2.-dong1,2. ZHAO Tie-cheng1, ZHANG Xue-ying1, FU Fen1, YANG jian-cheng1, MAO Li-jun1, XIAO chen1,2. XIAO Guo-qing1, ZHAO Hong-wei1, ZHAN Wen-long1(1 institute of Modern physics, {13., Lanzhou 73.000, china 2.Graduate School of {13., beijing 100049, china) institute of Modern physics Chinese Academy of SciencesLanzhou 730000China Graduate School of chinese academy of sciences Beijing 100049China institute of Modern physics Chinese Academy of SciencesLanzhou 730000China

With the commissioning of the Cooler Storage Ring at the Heavy Ion Research Facility in Lanzhou (HIRFL-CSR),a pilot experiment operating the CSRe in isochronous mode to test the power of HIRFL-CSR for measuring the mass of the short-lived nucleus was performed in December of 2.07. The fragments with A/q = 2.of 3.Ar were injected into CSRe and their revolution frequencies were measured with a fast time pick-up detector with a thin foil in the circulating path of the ions. The preliminary result is presented. The result shows the potential of CSRe for mass measurements of short-lived nuclei.

关键词： radiotive ion beam mass time-of-flight HIRFL-CSR

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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 {3.ng-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 {3. Hao-yu {3.ng Wei {3.ng Zhi-jie {3.ng Ling Kang Bo Li Chao Li {3.-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-{3.o 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 {2. Detection and Electronics University of Science and Technology of ChinaHefei 230026China State key laboratory of {2. 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 {2. 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 3.0 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

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Allelic Variation and Genetic Diversity at Glu-1 Loci in chinese Wheat (Triticum aestivum L.) Germplasms

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Agricultural sciences in china 2002年第10期1卷 1074-1082页

作者： ZHANG Xue-yong, PANG Bin-shuang, YOU Guang-xia, wang Lan-fen {2. Ji-zeng and DONG Yu-{3.(key laboratory of Crop Germplasm Resources and Biotechnology, Ministry of Agriculture /institute of Crop Germplasm Resources , chinese academy of Agricultural sciences , beijing 100081 , P. R . china ) key laboratory of Crop Germplasm Resources and Biotechnology Ministry of Agriculture/Institute of Crop Germplasm Resources Chinese Academy of Agricultural Sciences Beijing 100081 P.R. China

Wheat processing quality is greatly influenced by the seed proteins especially the high molecular weight glutenin subunit (HMW-GS) components, the low molecular weight glutenin subunit (LMW-GS) components and gliadin components. Genes encoding the HMW-GS and LMW-GS components were located on the long arms and the short arms of homoeologous group 1 chromosomes, respectively. HMW-GS components in 5 12. accessions of wheat germplasms were analyzed systematically, including 3.459 landraces and 1 670 modern varieties. These accessions were chosen as candidate core collections to represent the genetic diversity of chinese common wheat ( Triticum aestivum) germplasms documented and conserved in the National Gene Bank. These candidate core collections covered the 10 wheat production regions in china. In the whole country, the dominating alleles at the three loci are Glu-A1b (null), Glu-B1b (7 + 8), and Glu-D1a (2.+ 12., respectively. The obvious difference between the land race and the modern variety is the dramatic frequency increase of alleles Glu-A1a (1), Glu-B1c (7 + 9), Glu-B1h (14 + 15), Glu-D1d (5 + 10) and allele cording 5 + 12.subunits in the later ones. In the whole view, there is minor difference on the genetic(allelic)richness between the landrace and the modern variety at Glu-1, which is 2. and 3. respectively. However, the genetic dispersion index (Simpson index) based on allelic variation and frequencies at Glu-A1, Glu-B1 and Glu-D1 suggested that the modern varieties had much higher genetic diversity than the landraces. This revealed that various isolating mechanisms (such as auto-gamous nature, low migration because of undeveloped transposition system) limited the gene flow and exchange between populations of the landraces, which led up to some genotypes localized in very small areas. Modern breeding has strongly promoted gene exchanges and introgression between populations and previous isolated populations. In the three loci, Glu-Bl has the highest genetic

关键词： Wheat Core collection HMW glutenin subunits Genetic diversity

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Einstein Probe discovery of EP2.0408a:A peculiar X-ray transient with an intermediate timescale

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Science china(physics,Mechanics & Astronomy) 2024年

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 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 National Astronomical Observatories 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 chinese academy of sciences South African Astronomical Observatory Department of Astronomy University of Cape Town Department of physics University of the Free State Universite' Paris Cite' CNRS Astroparticule et Cosmologie Universite' Paris Cite' CEA Paris-Saclay School of Astronomy and Space sciences 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 University of chinese academy of sciences The University of Tokyo ESA/ESTEC Noordwijk 2.01 AZ The Netherlands Department of Astronomy School of physics Huazhong University of Science and Technology INAF-Osservatorio Astrofisico di Torino Sydney institute for Astronomy School of physics key laboratory of {2. {3. 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 Hefei School of Astronomy and Space sciences University of Science and Technology of china institute of High Energy physics institute of Deep Space sciences Deep Space Exploration laboratory Department of Astronomy School of physics and Astronomy Yunnan University Shanghai Astronomical Observatory chinese academy of Science

We report the discovery of a peculiar X-ray transient,EP2.0408a,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,2.2.,manifested in an intense yet brief X-ray flare lasting for *** flare reached a peak flux of 3.9×10-9erg cm-2.-1in 0.5-4 keV,3.0 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 keV,with a power-law photon index varying *** X-ray light curve shows a plateau lasting for4d,followed by a steep decay till becoming undetectable10 d after the initial *** on its temporal property and constraints from previous EP observations,an unusual timescale in the range of 7-2. d is found for EP2.0408a,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 EP2.0408a 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 EP2.0408a thus remains an *** suggest that EP2.0408a may represent a new type of transients with intermediate timescales of the order of10 *** detection and follow-ups of more of such objects are essential for revealing their origin.

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