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Searching for QCD critical point with light nuclei

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Nuclear Science and Techniques 2023年第5期34卷 192-195页

作者： che ming ko Cyclotron Institute and Department of Physics and Astronomy Texas A&M UniversityCollege StationTexas 77843‑3366USA

Density fluctuations and correlations due to a first-order quark-gluon plasma to hadronic matter phase transition and its critical end point,if they remain present after the hadronic evolution in a heavy ion collisions,can lead to an enhanced production of light nuclei in these *** would then result in a non-monotonic collision energy dependence of the yield ratio NtNp∕Nd2of proton number Np,deuteron number Nd,and triton number *** of this yield ratio as a function of collision energy thus provides the possibility to probe the equation of state of strong-interaction matter and its phase diagram.

关键词： critical collision light

Density fluctuations in baryon-rich quark matter

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Nuclear Science and Techniques 2016年第6期27卷 17-24页

作者： che ming ko Feng Li Cyclotron Institute and Department of Physics and Astronomy Texas A&M UniversityCollege Station

At finite baryon chemical potential,the density of a quark matter develops large fluctuations when it undergoes a first-order phase *** on the transport equation derived from the Nambu–Jona-Lasinio(NJL) model,we have studied the density fluctuations in a baryon-rich quark matter that is confined in a finite *** the expansion of the quark matter using initial conditions from either a blast wave model or a multiphase transport(AMPT) model,we have further studied the survivability of the density fluctuations as the density and temperature of the quark matter *** experimental signatures of the density fluctuations are suggested.

关键词：密度涨落夸克物质重子输运方程一级相变体积密度 AMPT 可生存性

A Dynamical Quark Coalescence Approach to φ and Ω Anisotropic Flows and Their Scaling in Heavy-Ion Collisions at RHIC

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高能物理与核物理 2007年第12期31卷 1149-1152页

作者：陈列文 che ming ko Institute of Theoretical Physics Shanghai Jiaotong University Cyclotron Institute and Physics Department Texas A& M University College StationTX 77843USA

We report the results on anisotropic flows and their scaling forφmesons andΩ(Ω^-+■^+)baryons in Au+Au collisions at RHIC,obtained from a dynamical quark coalescence model that uses the quark phase- space information from a multi-phase transport(AMPT)model within the string melting scenario and includes the quark structure of hadrons.

关键词：动态夸克合并方法各向异性流标定重离子碰撞 RHIC 多相转运

Yield ratio of hypertriton to light nuclei in heavy-ion collisions from √sNN=4.9 GeV to 2.76 TeV

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Chinese Physics C 2020年第11期44卷 86-93页

作者： Tian-Hao Shao Jin-Hui chen che ming ko Kai-Jia Sun Zhang-Bu Xu Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Institute of Applied Physics Chinese Academy of ScienceShanghai 201800China University of Chinese Academy of Science Beijing 100049China Cyclotron Institute and Department of Physics and Astronomy Texas A&M UniversityCollege StationTexas 77843USA Brookhaven National Laboratory UptonNew York 11973USA

We argue that the difference in the yield ratio S3=NΛ3H/NΛ/N3He/Np measured in Au+Au collisions at √sNN=200 GeV and in Pb-Pb collisions at √sNN=2.76 TeV is mainly owing to the different treatment of the weak decay contribution to the proton yield in the Au+Au collisions at √sNN=200 *** then use the coalescence model to extract from measured S3 the information about the Λ and nucleon density fluctuations at the kinetic freeze-out of heavy-ion *** also show,using available experimental data,that the yield ratio S2=NΛ3H/NΛNd is a more promising observable than S3 for probing the local baryon-strangeness correlation in the produced medium.

关键词： baryon-strangeness correlation hypernuclei QCD phase transition coalescence

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相对论重离子碰撞中正反粒子椭圆流的劈裂

科学通报 2020年第9期65卷 790-799页

作者：徐骏刘鹤 che ming ko 中国科学院上海高等研究院上海201210 中国科学院上海应用物理研究所上海201800 中国科学院大学核科学与技术学院北京100049 Cyclotron Institute and Department of Physics and Astronomy Texas A&M UniversityCollege StationTX77843-3366USA

相对论重离子碰撞是研究极端高温高密条件下新物质形态及量子色动力学相图的重要实验手段,而椭圆流是相对论重离子碰撞的重要实验观测量.近年来在美国布鲁克海文国家实验室的相对论重离子对撞机上进行束流能量扫描实验,研究人员发现了... 详细信息

相对论重离子碰撞是研究极端高温高密条件下新物质形态及量子色动力学相图的重要实验手段,而椭圆流是相对论重离子碰撞的重要实验观测量.近年来在美国布鲁克海文国家实验室的相对论重离子对撞机上进行束流能量扫描实验,研究人员发现了一些异于极端相对论重离子碰撞的行为,比如正反粒子椭圆流的劈裂.基于拓展的多相输运模型,可以通过正反粒子的不同平均场势来解释该实验现象,并可据此提取高重子及同位旋化学势下夸克物质的状态方程及相图信息.

关键词：相对论重离子碰撞椭圆流量子色动力学相图多相输运模型

Quark coalescence and the scaling of hadron elliptic flow

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Quark coalescence and the scaling of hadron elliptic flow

Hadronization via Coalescence

QCD和RHIC物理国际学术研讨会

作者： che-ming ko Texas A＆M University

＜正＞Quark coalescence occurs locally in phase space AMPT→large non-vanishing local momentum anisotropy, particularly directed flow Hadrons produced from quark coalescence also have non-vanishing momentum anisotropy Including hadrons in all regions of space→quark number scaling in naive quark coalescence. Quark scaling is, however, broken slightly by anisotropic radial flow and/or quark momentum spread in hadrons.

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Hadronization via Coalescence

Applying GA and Fuzzy Logic to Breakdown Diagnosis for Spinning Process

作者： che-ming ko Texas A&M University

＜正＞Introduction Quark coalescence Baryon/meson ratio Hadron elliptic flows and quark number scaling Effect of resonance decays Higher Fock states Charm flow Higher-order anisotropic flows

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Intelligent Information Management 2017年第1期9卷 21-38页

作者： Jeng-Jong Lin che-Jen Chuang Chih-Feng ko Department of Tourism and Leisure Management Vanung University Taiwan Department of Information Management Vanung University Taiwan

In this study, an effective search methodology based on fuzzy logic is applied to narrow down search range for the possible breakdown causes. Moreover a genetic algorithm (GA) is employed to directly find the intervals of solution to the inverse fuzzy inference problem during diagnosis procedure. Through the assistance of the developed intelligent diagnosis system, an inspector can be easier and more effective to find various possible occurred breakdown causes by judging from the observed symptoms during manufacturing process. An application of the developed intelligent diagnosis system to tracing the breakdown causes occurred during spinning process is reported in this study. The results show that the accuracy and efficiency of the diagnosis system are as promising as expected.

关键词： Fuzzy Logic Inverse Fuzzy Inference Genetic Algorithm Breakdown Diagnosis

Interfacing photonic crystal fiber with a metallic nanoantenna for enhanced light nanofocusing

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Photonics Research 2021年第2期9卷 252-258页

作者： KHANT MINN BLAKE BIRmingHAM BRIAN ko HO WAI HOWARD LEE ZHENRONG ZHANG Department of Physics Baylor UniversityWacoTexas 76798USA The Institute for Quantum Science and Engineering Texas A&M UniversityCollege StationTexas 77843USA Department of Physics&Astronomy University of CaliforniaIrvineCalifornia 92697USA Beckman Laser Institute and Medical Clinic University of CaliforniaIrvineCalifornia 92697USA

The direct interfacing of photonic crystal fiber to a metallic nanoantenna has widespread application in nanoscale imaging, optical lithography, nanoscale lasers, quantum communication, in vivo sensing, and medical *** report on the fabrication of a needle-shaped plasmonic nanoantenna on the end facet of a photonic crystal fiber using electron-beam-induced evaporation of platinum. We demonstrate the coupling of light from the fiber waveguide mode to the subwavelength nanoantenna plasmonic mode focusing down to the apex of the plasmonic needle using a polarization-resolved far-field side-scatter imaging technique. Our work provides an important step toward widespread application of optical fibers in nearfield spectroscopic techniques such as tip-enhanced Raman and fluorescence microscopy, single-photon excitation and quantum sensors, nanoscale optical lithography, and lab-on-fiber devices.

关键词： antenna fiber lithography