检索结果-南通市图书馆

Nuclear Science and Techniques 2022年第2期33卷 87-92页

作者： Wei-Ning Zhang Peng-Zhi Xu School of Physics Dalian University of TechnologyDalian 116024China College of Computer Science and Technology Jilin Normal UniversitySiping 136000China

The squeezed back-to-back correlation(SBBC)of a boson-antiboson pair is sensitive to the time distribution of the particle-emitting source,and the SBBC function for an evolving source is expected to be affected by the relaxation time of the *** this study,we investigated the effect of relaxation time on the SBBC *** propose a method for calculating the SBBC function with relaxation-time approximation for evolving *** functions of D^(0)D^(-0)in relativistic heavy-ion collisions were investigated using a hydrodynamic *** found that the relaxation time reduces the amplitudes of the SBBC *** becomes apparent for long relaxation times and large initial relative deviations of the chaotic and squeezed amplitudes from their equilibrium values in the temporal steps.

关键词： Relaxation time Squeezed back-to-back correlation Evolving source relativistic heavy-ion collisions

An Explanation of a Phenomenon in relativistic heavy-ion collisions

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2011年第4期55卷 640-642页

作者：陈小凡杨学栋陈志来孙芳魁苏润洲 Department of Physics Harbin Institute of Technology Department of Physics Northeast Forestry University

The multi-source pion interferometry in relativistic heavy-ion collisions is presented and two-source models for hadron gas and hadron gas plus quark-gluon plasma are proposed. The models can resolve the HBT puzzle. For the same q and different direction of q, the two-pion correlation functions show characteristic oscillation behaviors, which may be used to distinguish the two-source models. Our research also showes that the multi-source pion correlations can resolve the HBT puzzle.

关键词： multi-source pion interferometry HBT puzzle relativistic heavy-ion collisions

Gluon saturation and net-proton spectra in relativistic nucleus-nucleus collisions

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2011年第3期35卷 255-258页

作者：王宏民侯召宇王秀庭孙献静 Physics Department Academy of Armored Forces Engineering of PLA Physics Graduate School Shijiazhuang Railway Institute Institute of High Energy Physics Chinese Academy of Sciences

By means of the AKK08 fragmentation function, the net-proton transverse momentum （pT） spectra in A＋A collisions are studied with two phenomenological models based on the Color Glass Condensate formalism. After a χ2 analysis of the experimental data from BRAHMS, the normalization constant C is extracted at RHIC energies of √sNN =62.4 and 200 GeV, and the theoretical results of the net-proton pT spectra at selected rapidities are also given. It is shown that the theoretical results are in good agreement with the experimental data. Finally, assuming the constant C should have an exponent dependence of √sNN, we also predict the theoretical results of net-proton pT spectra at LHC energies of √sNN = 2.76, 3.94, and 5.52 TeV.

关键词： relativistic heavy-ion collisions gluon saturation net-proton spectra

Net-Baryon and Net-Kaon Rapidity Distributions in Ultrarelativistic heavy-ion collisions

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2012年第6期57卷 1043-1047页

作者：王宏民侯召宇孙献静 Physics Department Academy of Armored Forces Engineering of PLA Physics Graduate School Shijiazhuang Railway Institute Institute of High Energy Physics Chinese Academy of Sciences

In this paper,the gluon distribution is extracted from the KLR-AdS/CFT saturation model and used to investigate net-baryon and net-kaon rapidity distributions in ultrarelativistic heavy-ion *** the same parameters of the saturation model fitting to HERA data and an χ 2 analysis of the overall constant C,the theoretical results are in good agreement with RHIC data in Au+Au collisions at √ s = 0.2 ***,we present the predictive results for net-baryon rapidity distributions in central Pb+Pb collisions at LHC energies of √ s = 2.76,3.94,and 5.52 TeV,and give the corresponding values of dN/dy for net-baryon at y = 0.

关键词： relativistic heavy-ion collisions net-baryon rapidity distribution saturation model

Slow Particle Production in Nucleus-Nucleus collisions at relativistic Energies

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Physics 2016年第1期7卷 51-64页

作者： Mir Hashim Rasool Mohammad Ayaz Ahmad Shafiq Ahmad Department of Physics Aligarh Muslim University Aligarh India Physics Department Faculty of Science University of Tabuk Tabuk Saudi Arabia

In this paper an effort has been made to study the general characteristics of slow particles produced in the interactions of 32S-Em at 200 AGeV to extract the information about the mechanism of particle production. The results have been compared with the experimental results obtained by other workers. The multiplicity distributions of the slow target associated particles (black, grey and heavy tracks) produced by 32S-beam with different targets have been studied. Also several types of correlations among them have been investigated. The variation of the produced particles with projectile mass number and target size has been studied. Also the multiplicity distributions of slow particles with NBD fits are presented and scaling multiplicity distributions of slow particles produced have been studied in order to check the validity of KNO-scaling.

关键词： relativistic heavy-ion collisions Nuclear Emulsion Multiplicity Distribution Multiplicity Correlations KNO Scaling Negative Binomial Distribution

Two-dimensional multiplicity fluctuation analysis of target residues in nuclear collisions

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2010年第7期19卷 198-203页

作者：张东海牛耀婕王立春闫文君高丽娟李明星武丽萍李惠玲李俊生 Institute of Modern Physics Shanxi Normal University

Multiplicity fluctuation of the target residues emitted in the interactions in a wide range of projectile energies from 500 A MeV to 60 A GeV is investigated in the framework of two-dimensional scaled factorial moment methodology. The evidence of non-statistical multiplicity fluctuation is found in 160-AgBr collisions at 60 A GeV, but not in 56Fe-AgBr collisions at 500 A MeV, 84Kr-AgBr collisions at 1.7 A GeV, 16O-AgBr collisions at 3.7 A GeV and 197Au-AgBr collisions at 10.7 A GeV.

关键词： relativistic heavy-ion collisions target fragmentation non-statistical fluctuation

Properties of QCD matter:a review of selected results from ALICE experiment

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第12期35卷 409-437页

作者： Qi‑Ye Shou Yu‑Gang Ma Song Zhang Jian‑Hui Zhu Ya‑Xian Mao Hua Pei Zhong‑Bao Yin Xiao‑Ming Zhang Dai‑Cui Zhou Xin‑Ye Peng Xiao‑Zhi Bai Ze‑Bo Tang Yi‑Fei Zhang Xiao‑Mei Li 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 Key Laboratory of Quark&Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China School of Mathematics and Physics China University of Geosciences(Wuhan)Wuhan 430074China Department of Modern Physics University of Science and Technology of ChinaHefeiChina China Institute of Atomic Energy Beijing 102413China

The Large Hadron Collider(LHC), the world's largest and most powerful particle accelerator, has been a pivotal tool in advancing our understanding of fundamental physics. By colliding heavy ions, such as lead ions, the LHC recreates conditions similar to those just after the Big Bang. This allows scientists to study the quark-gluon plasma(QGP), a state of matter in which quarks and gluons are not confned within protons and neutrons. These studies provide valuable insights into the strong force and the behavior of the early universe. In this paper, we present a comprehensive overview of recent signifcant fndings from A Large ion Collider Experiment(ALICE) at the LHC. The topics covered include measurements related to the properties of the QGP, particle production, fow and correlations, dileptons, quarkonia, and electromagnetic probes, heavy favor, and jets. Additionally, we introduce future plans for detector upgrades in the ALICE experiment.

关键词： relativistic heavy-ion collisions Quark-gluon plasma LHC ALICE experiment

A GPU-based general numerical framework for plasma simulations in terms of microscopic kinetic equations with full collision terms

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2022年第5期24卷 57-63页

作者： Junjie ZHANG Xin ZHANG Guoliang PENG Zeping REN Northwest Institute of Nuclear Technology Xi’an 710024People’s Republic of China College of Mechanical and Electrical Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China

We have proposed a general numerical framework for plasma simulations on graphics processing unit clusters based on microscopic kinetic equations with full collision *** numerical algorithm consistently deals with both long-range(classical forces in the Vlasov term)and short-range(quantum processes in the collision term)*** the relevant particle masses,charges and types(classical,fermionic or bosonic),as well as the external forces and the matrix elements(in the collisional integral),the algorithm consistently solves the coupled multi-particle kinetic ***,the framework is being tested and applied in the field of relativistic heavy-ion collisions;extensions to other plasma systems are *** framework is a potential and competitive numerical platform for consistent plasma simulations.

关键词： plasma simulations GPU clusters microscopic kinetic equations Jefimenko’s equations relativistic heavy-ion collisions quark–gluon plasma

Helium production from ^84Kr- and ^197Au-emulsion interactions at high energies

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2009年第2期18卷 531-536页

作者：张东海程锦霞成宾王芳王琦张海青许蓉贾会明李雪琴 Institute of Modern Physics Shanxi Normal University

The properties of the relativistic helium fragments produced in interactions of ^84Kr at 1.8 A GeV and ^197Au at 10.7 A GeV in emulsion are investigated. The experimental results are compared with those obtained from various projectiles with emulsion collisions at different energies. It is found that the multiplicity distribution of helium projectile fragments （HPFs） is well described by the Koba-Nielsen Olesen （KNO） scaling presentation. The second Mueller moment f2 of the HPF multiplicity distribution is independent of the projectile energy for the same projectile, but it is dependent on the projectile mass number. The value of f2 increases with the increase of projectile mass number Ap. The negative value of f2, when Ap 〈 69, means that the emission of HPFs is anticorrelated, but positive value of f2, when Ap 〉 69, refers to that the emission of HPFs is correlated. The non-zero f2 moment in this experiment implies the strong correlation existing between the HPFs.

关键词： relativistic heavy-ion collisions projectile fragmentation nuclear emulsion

Study on higher moments of net-charge multiplicity distributions using a multiphase transport model

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2021年第7期45卷 263-272页

作者： Ling Huang Guo-Liang Ma Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Nuclear Physics and ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China

The moments and moment products of conserved charges are believed to be sensitive to critical fluctuations,which have been adopted in determining the QCD critical *** a dynamical multiphase transport model,we reproduce the centrality and energy dependences of moments and moment products of net-charge multiplicity distributions in Au+Au collisions,measured by the Beam Energy Scan program at the *** non-monotonic energy dependence is *** infer that the moment products develop during the dynamical evolution of heavy-ion *** observed difference based on the expectation of the Poisson baseline indicates a positive two-particle correlation between positively and negatively charged particles,which can arise from different dynamical processes at different ***,to adopt moments and moment products of net-charge multiplicity distributions in determining the QCD critical point of relativistic heavy-ion collisions,it is essential to consider the dynamical evolution.

关键词： QCD critical point fluctuation and correlation relativistic heavy-ion collisions quark gluon plasma