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New opportunities for nuclear and atomic physics on the femto-to nanometer scale with ultra-high-intensity lasers

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matter and Radiation at Extremes 2022年第2期7卷 1-7页

作者： Changbo Fu Guoqiang Zhang yugang ma Key Laboratory of Nuclear Physics and Ion-Beam Application(MoE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China

There are a number of puzzles concerning physics on the scale of nanometers to femtometers,including the neutron lifetime,the proton charge radius,and the possible existence of the deep Dirac *** the development of high-intensity laser technology,lasers today can induce extremely strong electromagnetic *** in the deep shells of atoms as well as the atomic nucleus itself can be affected by these *** may provide a new experimental platform for studies of physical processes on the femto-to nanometer scale,where atomic physics and nuclear physics *** this paper,we review possible new opportunities for studying puzzles on the femto-to nanometer scale using highintensity lasers.

关键词： intensity atomic shells

A possible Zpif's law in the nuclear disassembly

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Chinese Science Bulletin 2000年第16期45卷 1459-1464页

作者： Dingding Han yugang ma East China’s Normal University Shanghai China Shanghai Institute of Nuclear Research Chinese Academy of Sciences Shanghai China T. D. Lee-Fudan Physics Laboratory Fudan University Shanghai China

Zpif’s law in the field of linguistics is tested in the nuclear disassembly within the framework of isospin dependent lattice gas model. It is found that the average cluster charge (or mass) of rank n in the charge (or mass) list shows exactly an inverse order to its rank, i.e., Zpif’s law appears at the phase transition temperature. This novel criterion shall be helpful in searching the nuclear liquid gas phase transition.

关键词： lattice gas model liquid gas phase transition /.pil’s law.

An Investigation into the Total Reaction Cross Section and Production Cross Section of Energetic Particles

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Chinese Physics Letters 1993年第8期10卷 464-467页

作者： ma yugang SHEN Wenqing FENG Jun ma Yuqiang Institute of Nuclear Research Academia SinicaShanghai 201800 Department of Physics Nanjing UniversityNanjing 210008 CCAST(World Laboratory) P.O.Box 8730Beijing 100080

New calculations for the total reaction cross sections and production cross sections of the energetic particles are carried out via the nuclear transport *** ex-perimental total reaction cross sections cann be *** addition,the efects of some ingredients on the total reaction cross sections can be easily *** is found that the total reaction cross sections are sensitive to the nuclear equation of state bclow 100 MeV/u and the in-medium nicleon-ucleon cross section in the full energy range *** the π-mcson production cross sections can be also calculated..

关键词： theory cross addition

Nuclear Interaction Radii for Light Exotic Nuclei

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Chinese Physics Letters 1993年第7期10卷 401-404页

作者： FENG Jun SHEN Wenqing ma yugang Institute of Nuclear Research Academia SinicaShanghai 201800

We developed a simple model to calculate the interaction radii for light neutron-rich nuclei based on Coulomb-modified Glauber *** a relation of surface diffuseness of neutron distribution with the neutron separation energy of nucleus,the large increasing of nuclear interaction radii for exotic nuclei(such as ^(6)He,^(8)He,^(11)Li,^(11)Be)on ^(12)C target can be reasonably explained.

关键词： interaction separation radii

Energy and Target Dependence of Azimuthal Distributions at Mid-Rapidity in Mediate-Energy Nuclear Reactions

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Chinese Physics Letters 1993年第11期10卷 660-663页

作者： ma yugang HEN Wenqing FENG Jun CCAST(World Laboratory)P.O.Box 8730 Beijing 100080 Institute of Nuclear Research Academia SinicaShanghai 201800

The azimuthal distributions at mid-rapidity for ^(40)Ar-induced reactions are investigated by nuclear transport *** rotation-like behavior which is one of collective motions becomes stronger with the increasing of the imp&ct parameter and weaker with the increasing of the projectile *** about 85 MeV/nucleon the rot&tion-like behvior aim os t vanishes for ^(40)Ar+^(27)Al *** the rotation-like behavior becomes weaker and the out-of-plane enhancement of particle emisBion is revealed with the increasing of target *** quantitative agreements with the experiment data are also obtained.

关键词： theory. energy. rotation

Explore the QCD phase transition phenomena from a multiphase transport model

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Science China(Physics,Mechanics & Astronomy) 2019年第1期62卷 42-48页

作者： XiaoHai Jin JinHui Chen ZiWei Lin GuoLiang ma yugang ma Song Zhang Shanghai Institute of Applied Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Department of Physics East Carolina University Key Laboratory of Quarks and Lepton Physics (MOE) and Institute of Particle Physics Central China Normal University

We study the phase structure of QCD matter in the framework of a multiphase transport model by implementing a strong local parton density fluctuation scenario. Our calculations on the beam energy dependence of net-proton high moment show that local parton density fluctuation only has a small effect. But it becomes important when all baryons are included. We then study the effect on elliptic flow and find that an enhanced local parton density fluctuation leads to a significant effect on protons but a small effect on pions. Our study provides a reference of transport dynamics on QCD phase transition phenomena and will be relevant for the upcoming phase II of the beam energy scan program at RHIC.

关键词： QCD phase diagram parton density fluctuation AMPT model

acSB:Anti-Collision Selective-Based Broadcast Protocol in CRAdHocs

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Computers, materials & Continua 2018年第7期56卷 35-46页

作者： Yueyue Li Zhong Huang yugang ma Guangjun Wen Univeristy of Electronic Science and Technology of China Qingshuihe CampusNo.2006Xiyuan AveWest Hi-Tech ZoneChengduSichuan611731China Institute for Infocomm Research A*STAR1 Fusionopolis Way#21-01 Connexis(South Tower)138632Singapore

As a fundamental operation in ad hoc networks,broadcast could achieve efficient message *** y in the cognitive radio ad hoc network where unlicensed users have different sets of available channels,broadcasts are carried out on multiple ***,channel selection and collision avoidance are challenging issues to balance the efficiency against the reliability of *** this paper,an anticollision selective broadcast protocol,called acSB,is proposed.A channel selection algorithm based on limited neighbor information is considered to maximize success rates of transmissions once the sender and receiver have the same ***,an anticollision scheme is adopted to avoid simultaneous ***,the proposed broadcast acSB outperforms other approaches in terms of smaller transmission delay,higher message reach rate and fewer broadcast collisions evaluated by simulations under different scenarios.

关键词： Broadcast protocol selective protocol collision avoidance distributed data dissemination cognitive radio ad hoc network

machine learning in nuclear physics at low and intermediate energies

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Science China(Physics,Mechanics & Astronomy) 2023年第8期66卷 1-19页

作者： Wanbing He Qingfeng Li yugang ma Zhongming Niu Junchen Pei Yingxun Zhang Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan UniversityShanghai 200438China School of Science Huzhou UniversityHuzhou 313000China Institute of Modern Physics Chinese Academy of SciencesLanzhou 73000China School of Physics and Optoelectronic Engineering Anhui UniversityHefei 230601China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Southern Center for Nuclear-Science Theory(SCNT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China Department of Nuclear Physics China Institute of Atomic EnergyBeijing 102413China Guangxi Key Laboratory of Nuclear Physics and Technology Guangxi Normal UniversityGuilin 541004China

machine learning(ML)is becoming a new paradigm for scientific research in various research fields due to its exciting and powerful capability of modeling tools used for big-data processing *** this review,we first briefly introduce the different methodologies used in ML algorithms and *** a snapshot of many applications by ML,some selected applications are presented,especially for low-and intermediate-energy nuclear physics,which include topics on theoretical applications in nuclear structure,nuclear reactions,properties of nuclear matter,and experimental applications in event identification/reconstruction,complex system control,and firmware ***,we present a summary and outlook on the possible directions of ML use in low-intermediate energy nuclear physics and possible improvements in ML algorithms.

关键词： machine learning nuclear physics low and intermediate energies

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An Improved Microscopic Method for Calculating Initial Exciton Number

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Chinese Physics Letters 1993年第2期10卷 93-96页

作者： ma yugang SHEN Wenqing FENG Jun Institute of Nuclear Research Academia SinicaShanghai 201800

An improved microscopic model to calculate the initial exciton number has been developed on the basis of original microscopic model-so-called phase-space *** our model the particle number p0 and hole number h0 are treated separately and the Vlasov or BUU dynamics is used during the nucleus-nucleus collision instead of simple dynamical process without *** model reproduces the experimental results rather well.

关键词： collision dynamical BUU