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A compact isotope identification telescope with a wide dynamic range 被引量:1
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作者 徐瑚珊 诸永泰 +10 位作者 魏志勇 卢俊 李松林 王琦 谢元祥 张玉虎 吴钟立 尹涉芝 苟全补 赵庆中 宋明涛 《Nuclear Science and Techniques》 SCIE CAS CSCD 1996年第4期199-201,共3页
Acompactisotopeidentificationtelescopewithawidedynamic rangeXuHu-Shan(徐瑚珊),ZhuYong-Tai(诸永泰),WeiZhi-Tong(魏志勇)... Acompactisotopeidentificationtelescopewithawidedynamic rangeXuHu-Shan(徐瑚珊),ZhuYong-Tai(诸永泰),WeiZhi-Tong(魏志勇),LuJun(卢俊),LiSong... 展开更多
关键词 重离碰撞 同位素识别 氩离子束
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Charged Multiplicity Density and Number of Participant Nucleons in Relativistic Nuclear Collisions
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作者 SABen-Hao CAIXu 《Communications in Theoretical Physics》 SCIE CAS CSCD 2003年第2期212-218,共7页
The energy and centrality dependencies of charged particle pseudorapidity density in relativistic nuclear collisions were studied using a hadron and string cascade model, JPCIAE. Both the relativistic experimental da... The energy and centrality dependencies of charged particle pseudorapidity density in relativistic nuclear collisions were studied using a hadron and string cascade model, JPCIAE. Both the relativistic experimental data and the PHOBOS and PHENIX Au+Au data at RHIC energy could be fairly reproduced within the framework of JPCIAE model and without retuning the model parameters. The predictions for collisions at the LHC energy were also given. We computed the participant nucleon distributions using different methods. It was found that the number of participant nucleons is not a well defined variable both experimentally and theoretically. Thus it may be inappropriate to use the charged particle pseudorapidity density per participant pair as a function of the number of participant nucleons for distinguishing various theoretical models. 展开更多
关键词 charged multiplicity pseudorapidity density number of participant nucleons string fragmentation JPCIAE model
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Search for Tetraquarks in Relativistic Heavy-Ion Collisions
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作者 MA Zhong-Biao GAO Chong-Shou 《Communications in Theoretical Physics》 SCIE CAS CSCD 2006年第6X期1023-1026,共4页
Tetraquarks can be produced in relativistic heavy-ion collision. The yield of this kind of tetraquarks can increase significantly soon as the formation of QGP after the collision. If there is no phase transition after... Tetraquarks can be produced in relativistic heavy-ion collision. The yield of this kind of tetraquarks can increase significantly soon as the formation of QGP after the collision. If there is no phase transition after collision, the upper bound of the production of this four-quark states can be estimated from the free hadronlc gas model for nuclear matter. The relative yield ratio of tetraquark cs^-s^-s to Ω is less than 0.0164. 展开更多
关键词 TETRAQUARK hadronic gas QGP
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Estimation on Local Energy Density in Relativistic Heavy Ion Collisions
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作者 MAZhong-Biao GAOChong-Shou 《Communications in Theoretical Physics》 SCIE CAS CSCD 2003年第2期189-192,共4页
Energy density for the central region in relativistic heavy ion collisions can be estimated via the pseudorapidity distribution of transverse energy. The way to estimate the local energy density for the central region... Energy density for the central region in relativistic heavy ion collisions can be estimated via the pseudorapidity distribution of transverse energy. The way to estimate the local energy density for the central region in relativistic heavy ion collisions is proposed, in which only final state particles emitted from the same source are included. The arrived energy density in NA49 experiments is about 1.03 GeV/fm<SUP>3</SUP>. 展开更多
关键词 CM energy BACKGROUND EVOLUTION
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Influence of Chiral Mean Field on Kaon In-plane Flow in Heavy Ion Collisions
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作者 ZHENGYu-Ming FUCHSChristian +4 位作者 FAESSLERAmand SHEKHTERKirril SRISAWADPornrad KOBDAJChinorat YANYu-Peng 《Communications in Theoretical Physics》 SCIE CAS CSCD 2004年第5期746-750,共5页
The influence of the chiral mean field on the in-plane flow in heavy ion collisions at SIS energy is investigated within covariant kaon dynamics. For the kaon mesons inside the nuclear medium a quasi-particle picture... The influence of the chiral mean field on the in-plane flow in heavy ion collisions at SIS energy is investigated within covariant kaon dynamics. For the kaon mesons inside the nuclear medium a quasi-particle picture including scalar and vector fields is adopted and compared to the standard treatment with a static potential. It is confirmed that a Lorentz force from spatial component of the vector field provides an important contribution to the in-medium kaon dynamics and strongly counterbalances the influence of the vector potential on the in-plane flow. The calculated results show that the new FOPI data can be reasonably described using the Brown & Rho parametrization, which partly takes into account the correction of higher order contributions in the chiral expansion. This indicates that one can abstract the information on the kaon potential in a nuclear medium from the analysis of the in-plane flow. 展开更多
关键词 kaon in-plane flow kaon mean field covariant kaon dynamics heavy ion collision
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An Introduction to AdS/CFT Correspondence for Phenomenologists
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作者 陈斌 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第11期895-904,共10页
We give a brief introduction to the AdS/CFT correspondence and its application to QCD physics,especiallyits application in the study of quark-gluon-plasma (QGP)formed in the relativistic heavy ion collision (RHIC).Thi... We give a brief introduction to the AdS/CFT correspondence and its application to QCD physics,especiallyits application in the study of quark-gluon-plasma (QGP)formed in the relativistic heavy ion collision (RHIC).Thisreview is based on the talks given in several schools and programs for the phenomenologists working on nuclear physicsand particle physics. 展开更多
关键词 AdS/CFT correspondence QUARK-GLUON-PLASMA QCD
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Re-visit N/Z Ratio of Free Nucleons from Collisions of Neutron-Rich Nuclei as a Probe of EoS of Asymmetric Nuclear Matter
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作者 LIQing-Feng LIZhu-Xia +1 位作者 ZHAOEn-Guang H.Stoecker 《Communications in Theoretical Physics》 SCIE CAS CSCD 2004年第3期435-440,共6页
The N/Z ratio of free nucleons from collisions of neutron-rich nuclei as a function of their momentum is studied by means of isospin-dependent Quantum Molecular Dynamics. We find that this ratio is not only sensitive ... The N/Z ratio of free nucleons from collisions of neutron-rich nuclei as a function of their momentum is studied by means of isospin-dependent Quantum Molecular Dynamics. We find that this ratio is not only sensitive to the form of the density dependence of the symmetry potential energy but also its strength determined by the symmetry energy coefficient. The uncertainties about the symmetry energy coefficient influence the accuracy of probing the density dependence of the symmetry energy by means of the N/Z ratio of free nucleons of neutron-rich nuclei. 展开更多
关键词 symmetry potential heavy ion collisions neutron and proton chemical potential
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Resonances-Excitation Calculation Studies Investigation of △(3,3)in Ground State of ^(90)Zr Cold Finite Heavy Nucleus at Equilibrium and Under Large Compression
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作者 Mohammed H.E. Abu-Sei'leek 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第1期115-122,共8页
A non-relativistic microscopic mean field theory of finite nuclei is investigated where the nucleus is described as a collection of nucleons and delta resonances. The ground state properties of 90Zr nucleus have been ... A non-relativistic microscopic mean field theory of finite nuclei is investigated where the nucleus is described as a collection of nucleons and delta resonances. The ground state properties of 90Zr nucleus have been investigated at equilibrium and large amplitude compression using a realistic effective baryon-baryon Hamiltonian based on Reid Soft Core (RSC) potential. The sensitivity of the ground state properties is studied, such as binding energy, nuclear radius, radial density distribution, and single particle energies to the degree of compression. It is found that the most of increasing in the nuclear energy generated under compression is used to create the massive Δ particles. For 90Zr nucleus under compression at 2.5 times density of the normal nuclear density, the excited nucleons to Δ 's are increased sharply up to 14% of the total number of constituents. This result is consistent with the values extracted from relativistic heavy-ion collisions. The single particle energy levels are calculated and their behaviors under compression are examined too. A good agreement between results with effective Hamiltonian and the phenomenologieal shell model for the low lying single-particle spectra is obtained. A considerable reduction in compressibility for the nucleus, and softening of the equation of state with the inclusion of the Δ's in the nuclear dynamics are suggested by the results. 展开更多
关键词 nuclear structure compressed finite nuclei Δ-resonance
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An Explanation of a Phenomenon in Relativistic Heavy-Ion Collisions
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作者 陈小凡 杨学栋 +2 位作者 陈志来 孙芳魁 苏润洲 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第4期640-642,共3页
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. F... 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. 展开更多
关键词 multi-source pion interferometry HBT puzzle relativistic heavy-ion collisions
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ELECTRON TRANSFER COLLISION OF NEON IONS WITH Ne IN A RF ION TRAP
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作者 满宝元 王象泰 +2 位作者 胡燮荣 卓壮 何京良 《Nuclear Science and Techniques》 SCIE CAS CSCD 1995年第3期135-139,共5页
The pulsed electron beam rf ion storage system is used to study neon ions electron transfer, The rate coefficients for electron transfer of the neon ions with the neon gas are measured, the results are better than tho... The pulsed electron beam rf ion storage system is used to study neon ions electron transfer, The rate coefficients for electron transfer of the neon ions with the neon gas are measured, the results are better than those in other ion storage system. 展开更多
关键词 Ion storage Electron transfer Neon ions Neon atom
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The Weak Magnetic Photon Emission from Quark-gluon Plasma
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作者 SUN Jing’an YAN Li 《原子核物理评论》 CAS CSCD 北大核心 2024年第1期558-563,共6页
There must be electromagnetic fields created during high-energy heavy-ion collisions.Although the electromagnetic field may become weak with the evolution of the quark-gluon plasma(QGP),compared to the energy scales o... There must be electromagnetic fields created during high-energy heavy-ion collisions.Although the electromagnetic field may become weak with the evolution of the quark-gluon plasma(QGP),compared to the energy scales of the strong interaction,they are potentially important to some electromagnetic probes.In this work,we propose the coupled effect of the weak magnetic field and the longitudinal dynamics of the background medium for the first time.We demonstrate that the induced photon spectrum can be highly azimuthally anisotropic when the quarkgluon plasma is in the presence of a weak external magnetic field.On the other hand,the weak magnetic photon emission from quark-gluon plasma only leads to a small correction to the photon production rate.After hydrodynamic evolution with a tilted fireball configuration,the experimentally measured direct photon elliptic flow is well reproduced.Meanwhile,the used time-averaged magnetic field in the hydrodynamic stage is found no larger than a few percent of the pion mass square. 展开更多
关键词 heavy-ion collision the direct photon weak magnetic field elliptic flow
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Anisotropic Emission from Magnetized Quark-gluon Plasma
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作者 YU Xiaozhu WANG Xinyang 《原子核物理评论》 CAS CSCD 北大核心 2024年第1期564-572,共9页
this work,the polarization effects of a strongly magnetized quark-gluon plasma are studied at finite temperature.It is found that a background magnetic field can have a strong effect on the photon and dilepton emissio... this work,the polarization effects of a strongly magnetized quark-gluon plasma are studied at finite temperature.It is found that a background magnetic field can have a strong effect on the photon and dilepton emission rates.It affects not only the total rate but also the angular dependence.In particular,the Landau-level quantization leads to a nontrivial momentum dependence of the photon/dilepton anisotropic flow coefficient on transverse momentum.In the case of photon emission,nonzero coefficients v_(n)(with even n)have opposite signs at small and large values of the transverse momentum.Additionally,the v_(n) signs alternate with increasing vn,and their approximate values decrease as 1/n^(2) in magnitude.The anisotropy of dilepton emission is well-pronounced only at large transverse momenta and small invariant masses.The corresponding Un coefficients are of the same magnitude and show a similar sign-alternative pattern with increasing n as in the photon emission.It is proposed that the anisotropy of the photon and dilepton emission may serve as indirect measurements of the magnetic field. 展开更多
关键词 heavy ion collision electromagnetic probe strong magnetic field finite temperature theory
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Influence of the symmetry energy on the balance energy of the directed flow 被引量:4
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作者 GUO ChenChen WANG YongJia +3 位作者 LI QingFeng TRAUTMANN W LIU Ling WU LiJuan 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2012年第2期252-259,共8页
The influence of the density-dependent symmetry energy on the balance energy (Ebal) of directed flow from heavy ion collisions (HICs) at incident energies covered by INDRA and MSU experiments is studied, using the... The influence of the density-dependent symmetry energy on the balance energy (Ebal) of directed flow from heavy ion collisions (HICs) at incident energies covered by INDRA and MSU experiments is studied, using the updated version of the ultra- relativistic quantum molecular dynamics (UrQMD) model, especially adapted to low-energy heavy ion collisions (HICs). Four mass-symmetric reactions with total mass numbers between 192 and 394 are chosen for investigating the influence of the symmetry energy on the system-mass dependence of Eual. The results show that the uncertainty in the density dependence of the symmetry potential causes changes of Ebal of the order of several MeV, depending on the type of particle considered. The Ebal of neutrons from HICs is particularly sensitive to the density dependence of the symmetry potential energy, while the system-mass dependence of EbaI of Z = 1 particles is not. 展开更多
关键词 symmetry energy directed flow balance energy
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The effect of symmetry potential on the balance energy of light particles emitted from mass symmetric heavy-ion collisions with isotopes,isobars and isotones 被引量:4
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作者 WANG YongJia GUO ChenChen +1 位作者 LI QingFeng ZHANG HongFei 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2012年第12期2407-2413,共7页
Using the Ultrarelativistic Quantum Molecular Dynamics(UrQMD) model,the balance energies of free neutrons,free protons and Z=1 particles(including free protons,deuterons and tritons) from mass symmetric heavy-ion coll... Using the Ultrarelativistic Quantum Molecular Dynamics(UrQMD) model,the balance energies of free neutrons,free protons and Z=1 particles(including free protons,deuterons and tritons) from mass symmetric heavy-ion collisions with isotopes,isobars and isotones are studied.The influence of nuclear symmetry potential energy on the balance energy is emphasized.It is found that the balance energy of free neutrons is sensitive to the nuclear symmetry energy,while that of free protons is not.Particularly,the initial neutron/proton ratio dependence of the balance energy of free neutrons from Sn isotopes can be taken as a useful probe to constrain the stiffness of the nuclear symmetry energy. 展开更多
关键词 symmetry energy directed flow balance energy
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Effects of source opacity and expansion on two-pion Bose-Einstein correlations 被引量:3
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作者 LI ShuXia SUN PuNan XIAO DeHang 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第5期909-915,共7页
We examine two-pion Bose-Einstein correlations for partially coherent particle-emitting sources within quantum statistical formal- ism, where the sources are treated as classical currents with chaotic and coherent com... We examine two-pion Bose-Einstein correlations for partially coherent particle-emitting sources within quantum statistical formal- ism, where the sources are treated as classical currents with chaotic and coherent components. The two-pion correlation functions of the partially coherent sources contain a phase which is sensitive to the asymmetry of the source emission function. We investigate the influence of source opacity and expansion in high energy heavy ion collisions on the phase by Monte Carlo calculations. We find that these two physical effects shift the phase from zero. The Gaussian-formula fit results to the simulated two-pion correlation functions indicate that the opaque and expansion effects lead to a smaller interferometry radius Rout and a larger 2 parameter. 展开更多
关键词 two-pion correlation partially coherent sources asymmetry
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Temperature of Heavy Fragments in Heavy-Ion Collisions 被引量:1
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作者 马春旺 王闪闪 +4 位作者 普洁 陈丽 杨杰 杨佳斌 郭美婷 《Communications in Theoretical Physics》 SCIE CAS CSCD 2013年第1期95-98,共4页
The heavy fragments in heavy-ion collisions are finally formed after the hot prefragments undergo sequential decay, of whom the temperature should be much lower than that of prefragments. Using the double ratio (DR)... The heavy fragments in heavy-ion collisions are finally formed after the hot prefragments undergo sequential decay, of whom the temperature should be much lower than that of prefragments. Using the double ratio (DR) method, the isotopic thermometer (Tiso ) for heavy fragment is constructed using the yield of heavy isotopes. Tiso of heavy fragment is obtained by analyzing the measured data in the 1A GeV 124'136Xe and 140A MeV 48Ca/64Ni reactions. Result shows that Tiso varies from 0.5 MeV to 10 MeV. But most Tiso is around 1 4- 0.5 MeV, which is much lower than temperature of light particles. Result also indicates that the difference between Tiso of heavy fragments in different reactions is very small, and ~o is independent on the size of the reaction system, the incident energy and the neutron-richness of the projectile. 展开更多
关键词 TEMPERATURE double ratio method heavy fragment
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Influence of thermalization on the initial condition for heavy ion collisions 被引量:1
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作者 ZHAO AMeng SUN WeiMin ZONG HongShi 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2014年第11期2060-2069,共10页
In this paper,we discuss the important role of the thermalization process in the initial distribution of QGP.We find that the negligible heat conduction inside QGP can be expressed as an effective Fourier law and we f... In this paper,we discuss the important role of the thermalization process in the initial distribution of QGP.We find that the negligible heat conduction inside QGP can be expressed as an effective Fourier law and we further analyse qualitatively the results caused by a thermalized initial condition.Based on this arguments,we construct a simple phenomenological model and work with the hydro code,and then we compare our results with the experimental data and the results of the standard initial model.It is found that,as we have argued,a thermalized initial condition suppresses the value of the elliptic flow. 展开更多
关键词 elliptic negligible quark conduction relativistic hydrodynamic momentum Figure correspondence Landau
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Cold Nuclear Matter Effects on Isolated Prompt Photon and Isolated Prompt Photon+Jet Productions in Relativistic Heavy-Ion Collisions
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作者 代巍 陈时勇 +1 位作者 张本威 王思科 《Communications in Theoretical Physics》 SCIE CAS CSCD 2013年第3期349-355,共7页
We investigate the cold nuclear matter(CNM) effects on isolated prompt photon and isolated prompt photon associated jet productions in nuclear collisions at the NLO accuracy by using the EPS09 NLO nuclear parton distr... We investigate the cold nuclear matter(CNM) effects on isolated prompt photon and isolated prompt photon associated jet productions in nuclear collisions at the NLO accuracy by using the EPS09 NLO nuclear parton distribution functions and their error sets.Nuclear modification factors of isolated prompt photon and isolated prompt photon+jet productions due to CNM effects in p+A and A+A reactions at the RHIC and the LHC are provided with varying rapidity and transverse momentum of the final state photon.It is shown that the CNM effects on isolated prompt photon and photon+jet are modest,which give a small enhancement at low pT region and a more obvious suppression at large pT at central rapidity.At forward rapidity a pronounced suppression of γ as well as γ+jet is always observed. 展开更多
关键词 isolated photon prompt photon photon +jet cold nuclear matter effects heavy ion collisions EPS09 photon production
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Net-Baryon and Net-Kaon Rapidity Distributions in Ultrarelativistic Heavy-Ion Collisions
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作者 王宏民 侯召宇 孙献静 《Communications in Theoretical Physics》 SCIE CAS CSCD 2012年第6期1043-1047,共5页
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 collisions.With the same pa... 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 collisions.With 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 TeV.Then,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. 展开更多
关键词 relativistic heavy-ion collisions net-baryon rapidity distribution saturation model
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Physics perspectives of heavy-ion collisions at very high energy
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作者 Ning-bo Chang ShanShan Cao +18 位作者 Bao-yi Chen Shi-yong Chen Zhen-yu Chen Heng-Tong Ding Min He Zhi-quan Liu Long-gang Pang Guang-you Qin Ralf Rapp Bjorn Schenke Chun Shen HuiChao Song Hao-jie Xu Qun Wang Xin-Nian Wang Ben-wei Zhang Han-zhong Zhang XiangRong Zhu Peng-fei Zhuang 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2016年第2期1-27,共27页
Heavy-ion collisions at very high colliding energies are expected to produce a quark-gluon plasma(QGP) at the highest temperature obtainable in a laboratory setting. Experimental studies of these reactions can provide... Heavy-ion collisions at very high colliding energies are expected to produce a quark-gluon plasma(QGP) at the highest temperature obtainable in a laboratory setting. Experimental studies of these reactions can provide an unprecedented range of information on properties of the QGP at high temperatures. We report theoretical investigations of the physics perspectives of heavy-ion collisions at a future high-energy collider. These include initial parton production, collective expansion of the dense medium, jet quenching,heavy-quark transport, dissociation and regeneration of quarkonia, photon and dilepton production. We illustrate the potential of future experimental studies of the initial particle production and formation of QGP at the highest temperature to provide constraints on properties of strongly interaction matter. 展开更多
关键词 quark-gluon plasma heavy-ion collisions QCD phase transition properties of QGP
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