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

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

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Parameterizing an agricultural production model for simulating nitrous oxide emissions in a wheat–maize system in the North China Plain

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Atmospheric and Oceanic science Letters 2016年第6期9卷 403-410页

作者： LI Ting-Ting ZHANG wei wang jun ZHANG Wen wang Guo-Cheng XU Jing-Jing ZHANG Qing state key laboratory of Atmospheric Boundary Layer Physics and Atmospheric chemistry Institute of Atmospheric PhysicsChinese Academy of Sciences Nansen-zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of Sciences

Concentrations of atmospheric nitrous oxide （N2O）, a potent greenhouse gas, have been continuously increasing, and cropland soils are one of the largest sources of N2O. Variations in environmental and anthropogenic factors have substantial impacts on both the frequency and magnitude of N2O emissions. Based on measurements from a wheat-maize system in the North China Plain, the authors parameterized the Agricultural Production Systems Simulator （APSIM） model, which was initially developed in Australia, for simulating N2O emissions under different agricultural management practices. After calibrating one of the key parameters -- the fraction of N2O lost in nitrification （k2） -- the results showed that the model successfully captured the daily N2O fluxes under different nitrogen fertilization treatments, but underestimated some large peak fluxes. By pooling all data together, the calibrated APSIM model also performed well in representing cumulative N2O emissions under various treatments at annual and finer （monthly and daily） time scales.

关键词： Agricultural productionmodeling nitrous oxide wheat-maize system North China Plain

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Towards 6G wireless communication networks:vision, enabling technologies, and new paradigm shifts

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science China(Information sciences) 2021年第1期64卷 5-78页

作者： Xiaohu YOU Cheng-Xiang wang jie HUANG Xiqi GAO Zaichen ZHANG Mao wang Yongming HUANG Chuan ZHANG Yanxiang JIANG Jiaheng wang Min zhu Bin SHENG Dongming wang Zhiwen PAN Pengcheng zhu Yang YANG Zening LIU Ping ZHANG Xiaofeng TAO Shaoqian LI Zhi CHEN Xinying MA Chih-Lin I Shuangfeng HAN Ke LI Chengkang PAN Zhimin ZHENG Lajos HANZO Xuemin (Sherman) SHEN Yingjie Jay GUO Zhiguo DING Harald HAAS Wen TONG Peiying zhu Ganghua YANG jun wang Erik G.LARSSON Hien Quoc NGO wei HONG Haiming wang Debin HOU Jixin CHEN Zhe CHEN Zhangcheng HAO Geoffrey Ye LI Rahim TAFAZOLLI Yue GAO H.Vincent POOR Gerhard P.FETTweiS Ying-Chang LIANG National Mobile Communications Research laboratory School of Information Science and EngineeringSoutheast University Purple Mountain Laboratories Shanghai Institute of Fog Computing Technology (SHIFT) ShanghaiTech University Research Center for Network Communication Peng Cheng Laboratory state key laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications National Engineering laboratory for Mobile Network Technologies Beijing University of Posts and Telecommunications National key laboratory of science and Technology on Communications University of Electronic Science and Technology of China (UESTC) China Mobile Research Institute School of Electronics and Computer science University of Southampton Department of Electrical and Computer Engineering University of Waterloo Global Big Data Technologies Centre (GBDTC) University of Technology Sydney School of Electrical and Electronic Engineering The University of Manchester LiFi Research and Development Centre Institute for Digital CommunicationsSchool of EngineeringThe University of Edinburgh Huawei Technologies Canada Co. Ltd. Huawei Technologies Department of Electrical Engineering (ISY) Link?ping University Institute of Electronics Communications & Information Technology (ECIT)Queen's University Belfast state key laboratory of Millimeter Waves School of Information Science and EngineeringSoutheast University School of Electrical and Computer Engineering Georgia Institute of Technology 5G Innovation Centre University of Surrey Princeton University Vodafone Chair Mobile Communications Systems Technische Universit?t Dresden Center for Intelligent Networking and Communications (CINC) University of Electronic Science and Technology of China (UESTC)

The fifth generation(5G) wireless communication networks are being deployed worldwide from 2020 and more capabilities are in the process of being standardized, such as mass connectivity, ultra-reliability,and guaranteed low latency. However, 5G will not meet all requirements of the future in 2030 and beyond, and sixth generation(6G) wireless communication networks are expected to provide global coverage, enhanced spectral/energy/cost efficiency, better intelligence level and security, etc. To meet these requirements, 6G networks will rely on new enabling technologies, i.e., air interface and transmission technologies and novel network architecture, such as waveform design, multiple access, channel coding schemes, multi-antenna technologies, network slicing, cell-free architecture, and cloud/fog/edge computing. Our vision on 6G is that it will have four new paradigm shifts. First, to satisfy the requirement of global coverage, 6G will not be limited to terrestrial communication networks, which will need to be complemented with non-terrestrial networks such as satellite and unmanned aerial vehicle(UAV) communication networks, thus achieving a space-airground-sea integrated communication network. Second, all spectra will be fully explored to further increase data rates and connection density, including the sub-6GHz, millimeter wave(mmWave), terahertz(THz),and optical frequency bands. Third, facing the big datasets generated by the use of extremely heterogeneous networks, diverse communication scenarios, large numbers of antennas, wide bandwidths, and new service requirements, 6G networks will enable a new range of smart applications with the aid of artificial intelligence(AI) and big data technologies. Fourth, network security will have to be strengthened when developing 6G networks. This article provides a comprehensive survey of recent advances and future trends in these four aspects. Clearly, 6G with additional technical requirements beyond those of 5G will enable f

关键词： 6G vision network architecture air interface and transmission technologies space-air-ground-sea integrated network all spectra artificial intelligence network security

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Modeling study of regional severe hazes over mid-eastern China in January 2013 and its implications on pollution prevention and control

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science China Earth sciences 2014年第1期57卷 3-13页

作者： wang ZiFa LI jie wang Zhe YANG WenYi TANG Xiao GE Baozhu YAN PinZhong zhu LiLi CHEN XueShun CHEN HuanSheng WAND wei LI Jianjun LIU Bing wang XiaoYan WAND wei ZHAO YiLin LU Ning SU DeBin state key laboratory of Atmospheric Boundary Layer Physics and Atmospheric chemistry Institute of Atmospheric PhysicsChinese Academy of Sciences China National Environmental Monitoring Center Beijing Meteorological Bureau

The Nested Air Quality Prediction Model System(NAQPMS)was used to investigate the temporal and spatial variations of PM2.5over tropospheric central eastern China in January *** impact of regional transport and its implications on pollution prevention and control were also *** between simulated and observed PM2.5showed NAQPMS was able to reproduce the evolution of PM2.5during heavy haze *** results indicated that regional transport of PM2.5played an important role in regional haze episodes in the city cluster including Hebei,Beijing and Tianjin(HBT).The cross-city clusters transport outside HBT and transport among cities inside HBT contributed 20%–35%and 26%–35%of PM2.5as compared with local emission,in HBT *** meet the Air Quality Standards for Grade II,90%,90%and65%of emissions would have to be cut down in Hebei,Tianjin and Beijing,if non-control strategy was taken in the surrounding city clusters of *** implicated that control of emissions in one city cluster is not sufficient to reduce regional haze events,and joint efforts among city clusters are *** regional transports,two-way feedback between boundary-layer evolution and PM2.5also significantly contributed to the formation of heavy hazes,which contributed 30%of monthly average PM2.5concentration in HBT.

关键词： regional hazes trans-boundary transport feedback between boundary-layer evolution and PM2.5 pollution preventionand control

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Er^(3+)掺杂对ZnO/GaN发光二极管电致发光性能的调控

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发光学报 2021年第6期42卷 863-870页

作者：刘威李竹新王俊洁石增良东南大学生物科学与医学工程学院生物电子学国家重点实验江苏南京210096

采用水热法制备了Er^(3+)掺杂的ZnO纳米棒阵列,通过场发射扫描电镜、X单晶衍射谱仪、透射电镜、微区显微光谱仪等对其形貌结构和发光性能进行了表征。结果表明,掺杂前后ZnO纳米棒的形貌及晶型结构未发生改变,Er^(3+)被均匀地掺杂至ZnO... 详细信息

采用水热法制备了Er^(3+)掺杂的ZnO纳米棒阵列,通过场发射扫描电镜、X单晶衍射谱仪、透射电镜、微区显微光谱仪等对其形貌结构和发光性能进行了表征。结果表明,掺杂前后ZnO纳米棒的形貌及晶型结构未发生改变,Er^(3+)被均匀地掺杂至ZnO纳米棒中,并未发现形成Er_(2)O_(3);掺杂Er^(3+)后样品的光致发光光谱显示400 nm左右蓝光部分占比先提高后减少,其可见光占比减少归因于Er^(3+)填补了一部分锌空位缺陷,同时抑制了一部分氧空位缺陷。结合荧光寿命光谱分析也可发现其辐射发光部分寿命延长,表明荧光辐射效率提高。最终选取掺杂浓度为30%的单根ZnO纳米棒制备ZnO/GaN异质结发光二极管,与未掺杂Er^(3+)的样品相比,其电致发光强度提高了5倍。本研究可为ZnO基电致发光器件的性能改善提供一种简便可行的方法。

关键词： ZnO纳米棒阵列 Er^(3+)掺杂缺陷调控电致发光器件

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Overproduction of OsRACK1A,an effector-targeted scaffold protein promoting OsRBOHB-mediated ROS production,confers rice floral resistance to false smut disease without yield penalty

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Molecular Plant 2022年第11期15卷 1790-1806页

作者： Guo-Bang Li Jia-Xue He Jin-Long Wu He wang Xin Zhang jie Liu Xiao-Hong Hu Yong zhu Shuai Shen Yi-Fei Bai Zong-Lin Yao Xin-Xian Liu Jing-Hao Zhao De-Qiang Li Yan Li Fu Huang Yan-Yan Huang Zhi-Xue Zhao Ji-wei Zhang Shi-Xin Zhou Yun-Peng Ji Mei Pu Peng Qin Shigui Li Xuewei Chen Jing wang Min He weitao Li Xian-jun Wu Zheng-jun Xu Wen-Ming wang Jing Fan state key laboratory of Crop Gene Exploration and Utilization in Southwest China Sichuan Agricultural UniversityChengdu 611130China Rice Research Institute Sichuan Agricultural UniversityChengdu 611130China

Grain formation is fundamental for crop yield but is vulnerable to abiotic and biotic *** grain production is threatened by the false smut fungus Ustilaginoidea virens,which specifically infects rice floral organs,disrupting fertilization and seed ***,little is known about the molecular mechanisms of the ***-rice interaction and the genetic basis of floral ***,we report that *** secretes a cytoplasmic effector,UvCBP1,to facilitate infection of rice ***,UvCBP1 interacts with the rice scaffold protein OsRACK1A and competes its interaction with the reduced nicotinamide adenine dinucleotide phosphate oxidase OsRBOHB,leading to inhibition of reactive oxygen species(ROS)*** the analysis of natural variation revealed no OsRACK1A variants that could avoid being targeted by UvCBP1,expression levels of OsRACK1A are correlated with field resistance against *** in rice *** of OsRACK1A restores the OsRACK1A-OsRBOHB association and promotes OsRBOHB phosphorylation to enhance ROS production,conferring rice floral resistance to *** without yield *** together,our findings reveal a new pathogenic mechanism mediated by an essential effector from a flower-specific pathogen and provide a valuable genetic resource for balancing disease resistance and crop yield.

关键词： rice flower false smut fungal effector scaffold protein reactive oxygen species disease resistance

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Author Correction: Neuroprotectants attenuate hypobaric hypoxia-induced brain injuries in cynomolgus monkeys

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Zoological Research 2021年第2期42卷 250-251页

作者： Pei Zhang jie-Si Chen Qi-Ye Li Long-Xiang Sheng Yi-Xing Gao Bing-Zheng Lu Wen-Bo zhu Xiao-Yu Zhan Yuan Li Zhi-Bing Yuan Gang Xu Bi-Tao Qiu Min Yan Chun-Xue Guo You-Qiong wang Yi-jun Huang Jing-Xia Zhang Fu-Yu Liu Zhong-wei Tang Sui-Zhen Lin David NCooper Huan-Ming Yang Jian wang Yu-Qi Gao wei Yin Guo-jie Zhang Guang-Mei Yan state key laboratory of Genetic Resources and Evolution Kunming Institute of ZoologyChinese Academy of SciencesKunmingYunnan 650223China BGI-Shenzhen ShenzhenGuangdong 518083China Section for Ecology and Evolution Department of BiologyUniversity of CopenhagenCopenhagen DK-2100Denmark Department of Pharmacology Zhongshan School of MedicineSun Yat-Sen UniversityGuangzhouGuangdong 510080China Institute of Medicine and Hygienic Equipment for High Altitude Region College of High Altitude Military MedicineThird Military Medical UniversityChongqing 400038China key laboratory of High Altitude Medicine of People's Liberation Army Chongqing 400038China key laboratory of High Altitude Environmental Medicine Third Military Medical UniversityMinistry of EducationChongqing 400038China School of Pharmaceutical sciences Sun Yat-Sen UniversityGuangzhouGuangdong 510006China Guangzhou Cellprotek Pharmaceutical Co.Ltd. GuangzhouGuangdong 510663China Institute of Medical Genetics School of MedicineCardiff UniversityCardiff CF144XNUK James D.Watson Institute of Genome sciences HangzhouZhejiang 310058China Department of Biochemistry Zhongshan School of MedicineSun Yat-Sen UniversityGuangzhouGuangdong 510080China Center for Excellence in Animal Evolution and Genetics Chinese Academy of SciencesKunmingYunnan 650223China China National Genebank BGI-ShenzhenShenzhenGuangdong 518120China

Open Access This is an open-access article distributed under the terms of theCreative Commons Attribution Non-Commercial License(http:1/***/licenses/by-nc/4.0/).which permits unrestrictednon-commercial use,*** reprodu... 详细信息

关键词： Open Creative Access

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Comparative genomic and transcriptomic analyses uncover the molecular basis of high nitrogen-use efficiency in the wheat cultivar Kenong 9204

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Molecular Plant 2022年第9期15卷 1440-1456页

作者： Xiaoli Shi Fa Cui Xinyin Han Yilin He Long Zhao Na Zhang Hao Zhang Haidong zhu Zhexin Liu Bin Ma Shusong Zheng wei Zhang Jiajia Liu Xiaoli Fan Yaoqi Si Shuiquan Tian Jianqing Niu Huilan Wu Xuemei Liu zhuo Chen Deyuan Meng Xiaoyan wang Liqiang Song Lijing Sun jie Han Hui Zhao jun Ji Zhiguo wang Xiaoyu He Ruilin Li Xuebin Chi Chengzhi Liang Beifang Niu jun Xiao junming Li Hong-Qing Ling state key laboratory of Plant Cell and Chromosome Engineering Institute of Genetics and Developmental BiologyInnovation Academy for Seed DesignChinese Academy of SciencesBeijing 100101China key laboratory of Molecular Module-Based Breeding of High Yield and Abiotic Resistant Plants in Universities of Shandong College of AgricultureLudong UniversityYantai 264025China Computer Network Information Center Chinese Academy of SciencesBeijing 100190China Center for Agricultural Resources Research Institute of Genetics and Developmental BiologyChinese Academy of SciencesShijiazhuang 050022China state key laboratory of Plant Genomics Institute of Genetics and Developmental BiologyInnovation Academy for Seed DesignChinese Academy of SciencesBeijing 100101China College of Advanced Agricultural sciences University of Chinese Academy of SciencesBeijing 100049China School of Computer science and Technology University of Chinese Academy of SciencesBeijing 100049China CAS-JIC Centre of Excellence for Plant and Microbial science Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China Yazhou Bay Seed laboratory of Hainan Province Sanya 572019China

Studying the regulatory mechanisms that drive nitrogen-use efficiency(NUE)in crops is important for sustainable agriculture and environmental *** this study,we generated a high-quality genome assembly for the high-NUE wheat cultivar Kenong 9204 and systematically analyzed genes related to nitrogen uptake and *** comparative analyses,we found that the high-affinity nitrate transporter gene family had expanded in *** studies showed that subsequent functional differentiation endowed the expanded family members with saline inducibility,providing a genetic basis for improving the adaptability of wheat to nitrogen deficiency in various *** explore the genetic and molecular mechanisms of high NUE,we compared genomic and transcriptomic data from the high-NUE cultivar Kenong 9204(KN9204)and the low-NUE cultivar Jing 411 and quantified their nitrogen accumulation under high-and low-nitrogen *** with Jing 411,KN9204 absorbed significantly more nitrogen at the reproductive stage after shooting and accumulated it in the shoots and *** data analysis revealed that nitrogen deficiency clearly suppressed the expression of genes related to cell division in the young spike of Jing 411,whereas this suppression of gene expression was much lower in *** addition,KN9204 maintained relatively high expression of NPF genes for a longer time than Jing 411 during seed *** and transcriptome data revealed that KN9204 was more tolerant of nitrogen deficiency than Jing 411,especially at the reproductive *** high NUE of KN9204 is an integrated effect controlled at different *** together,our data provide new insights into the molecular mechanisms of NUE and important gene resources for improving wheat cultivars with a higher NUE trait.

关键词： wheat genome sequencing spatiotemporal gene expression expansion and differentiation of gene family nitrogen use efficiency Kenong 9204

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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

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Observation of a Ubiquitous(π,π)-Type Nematic Superconducting Order in the Whole Superconducting Dome of Ultra-Thin BaFe_(2-x)Ni_(x)As_(2) Single Crystals

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Chinese Physics Letters 2021年第9期38卷 85-95页

作者： Yu Dong Yangyang Lv Zuyu Xu M.Abdel-Hafiez A.N.Vasiliev Haipeng zhu junfeng wang Liang Li wanghao Tian wei Chen Song Bao Jinghui wang Yueshen Wu Yulong Huang Shiliang Li jie Yuan Kui Jin Labao Zhang Huabing wang Shun-Li Yu Jinsheng Wen Jian-Xin Li jun Li Peiheng Wu School of Electronic science and Engineering&School of Physics Nanjing UniversityNanjing 210093China National laboratory of Solid state Microstructures Nanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China National University of science and Technology(MISiS) Moscow 119049Russia Department of Physics and Astronomy Box 516Uppsala UniversityUppsala SE-75120Sweden Moscow state University Moscow 119991Russia Wuhan National High Magnetic Field Center&School of Physics Huazhong University of Science and TechnologyWuhan 430074China ShanghaiTech laboratory for Topological Physics&School of Physical science and Technology ShanghaiTech UniversityShanghai 201210China Beijing National laboratory for Condensed Matter Physics&Institute of Physics Chinese Academy of SciencesBeijing 100190China Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

In iron-based superconductors,the(0,π) or(π,0) nematicity,which describes an electronic anisotropy with a fourfold symmetry breaking,is well established and believed to be important for understanding the superconducting ***,how exactly such a nematic order observed in the normal state can be related to the superconducting pairing is still ***,by performing angular-dependent in-plane magnetoresistivity using ultra-thin flakes in the steep superconducting transition region,we unveil a nematic superconducting order along the(π,π) direction in electron-doped BaFe_(2-x)Ni_(x)As_(2) from under-doped to heavily overdoped regimes with x=0.065- *** shows superconducting gap maxima along the(π,π) direction rotated by 45° from the nematicity along(0, π) or(π,0) direction observed in the normal state.A similar(π,π)-type nematicity is also observed in the under-doped and optimally doped hole-type Ba1-yKyFe2 As_(2),with y=*** results suggest that the(π,π) nematic superconducting order is a universal feature that needs to be taken into account in the superconducting pairing mechanism in iron-based superconductors.

关键词： pairing (x) Crystal

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