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偶偶Cd同位素核的负宇称带研究

四川大学学报（自然科学版） 2003年第1期40卷 77-80页

作者：徐延冰刘英太廖继志兰州重离子加速器国家实验室原子核理论中心兰州730000 北京大学技术物理系北京100871 四川大学物理科学与技术学院成都610064

作者将具有正宇称的gds轨道空间扩大到包含具有负宇称的1h11/2.道,采用修正的表面δ相互作用(MSDI),对106Cd和108Cd两个偶偶核作了形变Hatree Fock(HF)计算,得到了基态和一些激发态的解.同时,还用近似角动量投影形变Hartree Fock(PDHF... 详细信息

作者将具有正宇称的gds轨道空间扩大到包含具有负宇称的1h11/2.道,采用修正的表面δ相互作用(MSDI),对106Cd和108Cd两个偶偶核作了形变Hatree Fock(HF)计算,得到了基态和一些激发态的解.同时,还用近似角动量投影形变Hartree Fock(PDHF)方法,对106Cd和108Cd进行了能谱计算,得到其正、负宇称带的解,计算结果与实验谱基本一致.

关键词：偶偶Cd同位素核角动量投影单粒子能谱负宇称带核结构基态激发态

Robust asymmetric Cherenkov radiation in tilted anisotropic medium

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Science china(physics,Mechanics & Astronomy) 2024年第1期67卷 46-51页

作者： Shuwen Xue Yadong Xu Linkang Han Zhi Ning chen Qiaoliang Bao Shan Zhu Huanyang chen institute of Electromagnetics and Acoustics and department of {2. College of Physical Science and TechnologyJiujiang Research InstituteXiamen UniversityXiamen 361005China School of Physical Science and Technology Institute of Theoretical and Applied PhysicsSoochow UniversitySuzhou 215006China department of Electrical and Computer Engineering National University of SingaporeSingapore 8117583Singapore institute of Energy Materials Science(IEMS) University of Shanghai for Science and TechnologyShanghai 200093China

Cherenkov radiation(CR)is available for a wide variety of terahertz(THz)radiation sources,but its efficiency is deeply affected by intrinsic *** find that if the tilted angle(α)of anisotropic material and radiation angle(θ)meet the condition ofθ+α=π/2.the intensity of radiation fields for the charged particle bunch(CPB)moving from left to right cannot be influenced by intrinsic losses,which means long-distance radiation can be ***,we observe an asymmetric CR when the CPB moves from the opposite *** addition,we select natural van der Waals(vd W)materialα-MoO3.s an example,further confirming that the radiation field can reach the far field and the asymmetric CR radiation can also be *** wonderful properties with long-distance radiation will extend the application of CR to a certain extent for future design and fabrication.

关键词： asymmetric Cherenkov radiation intrinsic losses long-distance radiation

Quantized anomalous Hall resistivity achieved in molecular beam epitaxy-grown Mn Bi2.e4 thin films

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National Science Review 2024年第2期11卷 24-32页

作者： Yunhe Bai Yuanzhao Li jianli Luan Ruixuan Liu Wenyu Song Yang chen Peng-Fei ji Qinghua Zhang Fanqi Meng Bingbing Tong Lin Li Yuying jiang Zongwei Gao Lin Gu jinsong Zhang Yayu Wang Qi-Kun Xue Ke He Yang Feng Xiao Feng State Key Laboratory of Low Dimensional Quantum physics Department of Physics Tsinghua University institute of physics Chinese Academy of Sciences School of Materials Science and Engineering Tsinghua University Beijing Academy of Quantum Information Sciences Frontier Science Center for Quantum Information Hefei National Laboratory Southern University of Science and Technology

The intrinsic magnetic topological insulator MnBi2.e4provides a feasible pathway to the high-temperature quantum anomalous Hall（QAH） effect as well as various novel topological quantum phases. Although quantized transport properties have been observed in exfoliated MnBi2.e4thin flakes, it remains a big challenge to achieve molecular beam epitaxy（MBE）-grown MnBi2.e4thin films even close to the quantized regime. In this work, we report the realization of quantized anomalous Hall resistivity in MBE-grown MnBi2.e4thin films with the chemical potential tuned by both controlled in situ oxygen exposure and top gating. We find that elongated post-annealing obviously elevates the temperature to achieve quantization of the Hall resistivity, but also increases the residual longitudinal resistivity, indicating a picture of high-quality QAH puddles weakly coupled by tunnel barriers. These results help to clarify the puzzles in previous experimental studies on MnBi2.e4and to find a way out of the big difficulty in obtaining MnBi2.e4samples showing quantized transport properties.

关键词： intrinsic magnetic topological insulator quantized anomalous Hall resistivity molecular beam epitaxy quantized transport property

Wobbling Motion in the Even-even Nucleus

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原子核物理评论 2024年第1期41卷 200-206页

作者： SUN Bowen ji Yingzhi chen Qibo department of physics East China Normal UniversityShanghai 200241China

The recent progresses on the wobbling motion are briefly *** far 17 wobbling candidates have been reported in odd-A and even-even nuclei that spread over A≈100,13.,160 and 190 mass *** two-quasiparticle configuration wobbling in ^(13.)Ba and the wobbling motion in a triaxial rotor are taken as examples in this paper to show the wobbling motion in even-even *** the ^(13.)Ba,the wobbling are investigated based on the combination of the covariant density functional theory(CDFT)and the particle rotor model(PRM).The CDFT provides crucial information on the configuration and deformation parameters of observed bands,serving as input for PRM *** corresponding experimental energy spectra and electromagnetic transition probabilities are *** analysis of the angular momentum geometry reveals the enhanced stability of transverse wobbling of a two-quasiparticle configuration compared to a single-quasiparticle *** the triaxial rotor,the time evolution of wobbling motion is explored through the solution of Euler *** investigation yields valuable insights into the evolution of orientation angles(φ and θ)and angular momentum ***,the study reveals that low-energy states of a triaxial rotor predominantly exhibit wobbling motion around the intermediate ***,an increase in excitation energy corresponds to a prolonged period of intermediate axis wobbling ***,a contrasting trend is observed in the case of long axis wobbling,where an increase in excitation energy leads to a decrease in the wobbling period.

关键词： wobbling motion even-even nucleus two-quasiparticle time evolution

Accurate prediction of interference minima in linear molecular harmonic spectra by a modified two-center model

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Chinese physics B 2016年第3期25卷 163-168页

作者：崔鑫张頔玉陈高陈基根曾思良郭福明杨玉军 institute of Atomic and Molecular physics Jilin UniversityChangchun 130012China jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy Jilin UniversityChangchun 130012China School of Science Changchun University of Science and TechnologyChangchun 130022China department of physics and Materials Engineering Taizhou UniversityTaizhou 318000China institute of Applied physics and Computational Mathematics Beijing 100088China

We demonstrate that the interference minima in the linear molecular harmonic spectra can be accurately predicted by a modified two-center model. Based on systematically investigating the interference minima in the linear molecular harmonic spectra by the strong-field approximation （SFA）, it is found that the locations of the harmonic minima are related not only to the nuclear distance between the two main atoms contributing to the harmonic generation, but also to the symmetry of the molecular orbital. Therefore, we modify the initial phase difference between the double wave sources in the two-center model, and predict the harmonic minimum positions consistent with those simulated by SFA.

关键词： high-order harmonic generation molecular harmonics

Application of deep learning methods combined with physical background in wide field of view imaging atmospheric Cherenkov telescopes

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Nuclear Science and Techniques 2024年第4期35卷 208-220页

作者： Ao-Yan cheng Hao Cai Shi chen Tian-Lu chen Xiang Dong You-Liang Feng Qi Gao Quan-Bu Gou Yi-Qing Guo Hong-Bo Hu Ming-Ming Kang Hai-{3.n Li chen Liu Mao-Yuan Liu Wei Liu Fang-sheng Min Chu-cheng Pan Bing-Qiang Qiao Xiang-Li Qian Hui-Ying Sun Yu-Chang Sun Ao-Bo Wang Xu Wang Zhen Wang Guang-Guang Xin Yu-Hua Yao Qiang Yuan Yi Zhang School of physics and Technology Wuhan UniversityWuhan 430072China School of physics and Astronomy Yunnan UniversityKunming 650091China Ministry of Education The Key Laboratory of Cosmic Rays(Tibet University)Lhasa 850000China Key Laboratory of particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences 19 A Yuquan RoadShijingshan DistrictBeijing 100049China College of physics Sichuan UniversityChengdu 610064China School of Intelligent Engineering Shandong Management UniversityJinan 250357China Tsung‑Dao Lee institute Shanghai Jiao Tong UniversityShanghai 200240China Suzhou Aerospace Information Research institute Suzhou 215123China College of physics Chongqing UniversityNo.55 Daxuecheng South RoadHigh‑tech DistrictChongqing 401331China Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210008China

The High Altitude Detection of Astronomical Radiation(HADAR)experiment,which was constructed in Tibet,china,combines the wide-angle advantages of traditional EAS array detectors with the high-sensitivity advantages of focused Cherenkov *** objective is to observe transient sources such as gamma-ray bursts and the counterparts of gravitational *** study aims to utilize the latest AI technology to enhance the sensitivity of HADAR *** datasets and models with distinctive creativity were constructed by incorporating the relevant physical theories for various *** models can determine the type,energy,and direction of the incident particles after careful *** obtained a background identification accuracy of 98.6%,a relative energy reconstruction error of 10.0%,and an angular resolution of 0.2.°in a test dataset at 10 *** findings demonstrate the significant potential for enhancing the precision and dependability of detector data analysis in astrophysical *** using deep learning techniques,the HADAR experiment’s observational sensitivity to the Crab Nebula has surpassed that of MAGIC and *** energies below 0.5 TeV and remains competitive with conventional narrow-field Cherenkov telescopes at higher *** addition,our experiment offers a new approach for dealing with strongly connected,scattered data.

关键词： VHE gamma-ray astronomy HADAR Deep learning Convolutional neural networks

Experiment of X-ray Generations Using Laser-Compton Scattering at LINAC of SINAP

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原子核物理评论 2009年第S1期26卷 109-114页

作者： PAN Qiang-yan1,XU Wang1,LUO Wen1,3.FAN Gong-tao1,3.Yang Li-feng1,3.Fan Guang-wei1,3.LI Yong-jiang1,3.XU Ben-ji1,SHI Xiang-chun2.LIN Guo-qiang1, YAN Zhe1,XU Yi1,3.{2. jing-gen1,GUO Wei1,WANG Hong-wei1,WANG {2.g-bin1, XU jia-qiang1,Ma Yu-gang1,CAI Xiang-zhou1, ZHAO Ming-hua1,SHEN Wen-qing1(1 Shanghai institute of Applied physics,Chinese Academy of Sciences,Shanghai 2.1800,china 2.Shanghai institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 2.1800,china 3.Graduate School of Chinese Academy of Sciences,Beijing 100049,china) Shanghai institute of Applied physics Chinese Academy of SciencesShanghai 201800China Shanghai institute of Applied physics Chinese Academy of SciencesShanghai 201800China Graduate School of Chinese Academy of Sciences Beijing 100049China

Laser Compton scattering(LCS) can generate X-rays or γ-rays with high brightness and easy controlled polarization by applying high-peak-power laser pulses to relativistic electron bunches. One of the most promising approaches to short pulsed X-ray sources is the laser synchrotron source. It is based on LCS between picoseconds relativistic electron bunches and picoseconds laser pulses. A project of Shanghai laser electron gamma source with LCS method has been proposed on Shanghai synchrotron radiation facility. Before that,a prototype has been developed in the beamline of the linear accelerator at the Shanghai institute of Applied physics,Chinese Academy of Sciences. The LCS experiment was carried out by using the 107 MeV,5 Hz,1 ns,0.1 nC electron bunches from the linear accelerator and the 18 ns,10 MW peak power,Nd∶YAG laser pulses. In this communication,we describe the details and report the first results of this experiment.

关键词： Compton scattering Nd∶YAG laser γ-ray source polarization

钝顶螺旋藻 (Spirulina platensis)藻胆体Langmuir- Blodgett膜(英文)

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生物化学与生物物理学报 2003年第10期35卷 952-955页

作者：陈超张玉忠陈秀兰周百成高鸿钧山东大学微生物技术国家重点实验室中国科学院物理研究所纳米物理与器件实验室济南2.0100 中国科学院海洋研究所青岛2.6071 北京10008

从钝顶螺旋藻中分离制备完整藻胆体 ,然后滴加于空气水界面上 ,应用LB膜技术制备藻胆体LB膜。结果表明 ,藻胆体在空气水界面上具有很好的成膜性能。将藻胆体LB单层膜转移到刚揭开的云母表面 ,喷一层金 ,然后用扫描隧道显微镜观察。结... 详细信息

从钝顶螺旋藻中分离制备完整藻胆体 ,然后滴加于空气水界面上 ,应用LB膜技术制备藻胆体LB膜。结果表明 ,藻胆体在空气水界面上具有很好的成膜性能。将藻胆体LB单层膜转移到刚揭开的云母表面 ,喷一层金 ,然后用扫描隧道显微镜观察。结果表明 ,藻胆体在Langmuir Blodgett膜中的排列方式与其在体内类囊体膜表面的排列方式类似 ,一排排聚集在一起 ,然后排列成膜。藻胆体的“核”吸附在云母表面 ,而藻胆体的“杆”伸向外面。由于钝顶螺旋藻易于规模化培养 ,藻胆体容易批量制备 ,加之藻胆体具有的独特的光物理、光化学特性和良好的成膜性能 ,以及本身就是纳米量级的颗粒 (5 0 70nm) ,预示着藻胆体在纳米光电子器件中具有很好的应用前景。

关键词：钝顶螺旋藻藻胆体 Langmuir-Blodgett膜扫描隧道显微镜(STM)

Explaining the dynamics of the sub-relativistic electron third belt in the Earth's radiation belts by using medium Earth orbit satellite observations

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Earth and Planetary physics 2024年第5期8卷 762-775页

作者： jiaLi chen Hong Zou YuGuang Ye institute of Space physics and Applied Technology Peking University

The Earth's electron radiation belts typically exhibit a two-belt structure. However, observations from the Van Allen Probes revealed the existence of a three-belt structure. This structure consists of an inner belt, a slot region, a remnant belt, a “second slot,” and a new outer belt(or the “third belt”). The formation of the structure involves both the partial loss of the original outer belts and the formation of the third belts. These processes are likely associated with radial diffusion induced by ultra-low-frequency(ULF) waves. In this study, we mainly analyzed electron flux data from medium Earth orbit(MEO) navigation satellites M17–M19 to supplement the observational evidence for the sub-relativistic electron(～100–500 keV) three-belt structure. Evidence of substorm injections and ULF waves during the three-belt event was identified, suggesting they played significant roles in the formation and evolution of the third *** injections may introduce new electron populations to the third belt, whereas ULF waves may influence the evolution of the third belt through radial diffusion. Toward the end of the three-belt event, the compression of the magnetosphere by shocks may lead to the dropout of the third belt because of the magnetopause shadowing effect and outward radial diffusion, ultimately disrupting the three-belt structure. This study provides more evidence for the presence of a sub-relativistic electron three-belt structure and offers an analysis of the evolutionary mechanisms of the third belt, which may contribute to a comprehensive understanding of the electron three-belt structure in the radiation belts.

关键词： third belt sub-relativistic electrons three-belt structure radiation belts magnetic storms and substorms wave–particle interactions