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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

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

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

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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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

Hadronization via Coalescence

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Hadronization via Coalescence

Spin Polarizations in a Covariant Angular Momentum Conserved Chiral Transport Model

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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IMP & HIRFL Annual Report 2019年第1期 36-36页

作者： Liu Shuai Y.F. Sun Yifeng che ming ko 不详

To achieve total angular momentum conservation is highly nontrivial in constructing transport models when the spin-orbit interactions are not *** our recent works[1,2],we have developed the first transport model that rigorously respects this fundamental conservation law by carefully including the side-jump effect[3,4]caused by spin-orbit interactions.

关键词： Polarization negligible nontrivial

Polyphosphoester-modified Cellulose Nanocrystals for Stabilizing Pickering Emulsion Polymerization of Styrene

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Chinese Journal of Polymer Science 2020年第9期38卷 921-931,I0005页

作者： Kun-ming che ming-Zu Zhang Jin-Lin He Pei-Hong Ni College of chemistry Chemical Engineering and Materials ScienceState and Local Joint Engineering Laboratory for Novel Functional Polymeric MaterialsJiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationSuzhou Key Laboratory of Macromolecular Design and Precision SynthesisSoochow UniversitySuzhou 215123China

The structure and properties of functional nanoparticles are important for stabilizing Pickering emulsion ***,cellulose nanocrystals(CNCs)are increasingly favored as a bio-based stabilizer for Pickering *** this study,we reported a novel functionalized polyphosphoester-grafted CNCs for the stabilization of oil-in-water Pickering emulsions and the emulsion polymerization of ***,polyphosphoester containing an amino group at one end of the chain,abbreviated as PBYP-NH2,was prepared by ring-opening polymerization(ROP)and hydrolysis reaction,wherein PBYP represents poly[2-(but-3-yn-1-yloxy)-2-oxo-1,3,2-dioxaphospholane].Subsequently,CNC-COOH was obtained via 2,2,6,6-tetramethylpiperidine-1-oxyl(TEMPO)oxidation of *** functionalized nanocrystals CNC-PBYP-COOH with carboxyl groups and polyphosphoester on the surface were obtained by the amidation reaction of PBYP-NH2 with ***,we used CNC-PBYP-COOH as sole particle emulsifiers to stabilize styrene-in-water Pickering emulsions and studied its effects on the emulsions in details by using dynamic light scattering(DLS).The results indicated that the properties of these emulsions depended on the concentration of hydrophobically modified CNCs,volume ratios of oil to water,and pH *** modified CNCs had higher ability to stabilize the styrene-in-water emulsions relative to the unmodified CNCs,and a stable oil-in-water(o/w)Pickering emulsion with diameter of hundreds of nanometers could be *** resulting emulsions could be polymerized to yield nanosized *** polyphosphoester-modified CNCs as green particle emulsifiers can efficiently stabilize nanoemulsions and latexes,which would promote the development of novel environmentally friendly materials.

关键词： Cellulose nanocrystals(CNCs) Polyphosphoesters(PPEs) Pickering emulsion Emulsion polymerization

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重离子碰撞中的轻核产生和QCD相变

核技术 2023年第4期46卷 159-175页

作者：孙开佳陈列文 ko che ming 李峰徐骏许长补复旦大学现代物理研究所核物理与离子束应用教育部重点实验室上海200433 理论物理专款上海核物理理论研究中心上海200438 上海交通大学物理与天文学院上海市粒子物理和宇宙学重点实验室粒子物理与星系宇宙学教育部重点实验室上海200240 Cyclotron Institute and Department of Physics and Astronomy Texas A&M UniversityCollege StationTA77843USA 兰州大学物理科学与技术学院兰州730000 同济大学物理科学与工程学院上海200092 Physics Department Brookhaven National LaboratoryUptonNY11973USA

寻找量子色动力学(Quantum Chromodynamics,QCD)相变信号是当前重离子碰撞实验的一个基础科学目标,对理解强相互作用物质的性质、大爆炸初期的宇宙演化、超新星的爆发机制、致密星的内部结构以及双中子星并合产生的引力波等重要前沿问... 详细信息

寻找量子色动力学(Quantum Chromodynamics,QCD)相变信号是当前重离子碰撞实验的一个基础科学目标,对理解强相互作用物质的性质、大爆炸初期的宇宙演化、超新星的爆发机制、致密星的内部结构以及双中子星并合产生的引力波等重要前沿问题都具有重要意义。当重离子碰撞中发生非连续QCD相变时,引发的强相互作用物质的密度涨落与关联可以通过轻原子核的产额观察量来探测。核子间的多体关联决定了重离子碰撞中轻核的产额。特别地,基于核子并合模型对于轻核产额的计算表明质子(p)、氘核(d)和氚核(t)的产额比值N_(t)N_(p)/Nd_(2)敏感于核子密度涨落与关联,是一个较好的寻找QCD相变信号的可观测量。进一步,基于输运模型对于重离子碰撞中的手征相变的模拟发现,当系统的相轨迹经过一阶相变区域时,轻核产额比值N_(t)N_(p)/Nd_(2)有明显增加。这些结果为利用重离子碰撞中的轻核产生寻找QCD相变提供了理论依据。

关键词：重离子碰撞 QCD相变轻核产生并合模型临界涨落