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国家自然科学基金(10775167)

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中子质子产额比与丰中子核中子皮厚度的关联
在同位旋相关的量子分子动力学(IQMD)模型框架下研究了丰中子核作为炮弹的核反应中的中子质子产额比(R=Y/Y)与弹核中子皮厚度δnp的依赖关系。在IQMD模型中,炮弹和靶的初始化密度都采用液滴模型密度分布形式,通过调节...
孙小艳方德清马余刚蔡翔舟田文栋张国强周培
关键词:中子皮
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Shear Viscosity to Entropy Density Ratio in Au+Au Central Collisions
2012年
The shear viscosity (7) and entropy density (s) are studied for the central Au+Au collisions with the help of a microscopic transport model, namely the isospin-dependent quantum molecular dynamic model (IQMD). Employ the formula given in Ref. [1],η is calculated as a time dependent variable for different incident energies from 40 MeV/u to 120 MeV/u and the energy dependence of η/s of nuclear matter in the most compressed stage in collision process is displayed.
周铖龙马余刚方德清
Effects of bulk viscosity on hadron spectra and the Hanbury-Brown Twiss radius by causal viscous hydrodynamics
2009年
The particle spectra and Hanbury-Brown Twiss (HBT) radius of Au+Au collisions at RHIC energy are investigated by a hydrodynamical expanding source with both shear and bulk viscosities (ζ). With a large width of the ratio of ζ to entropy density s, both the particle transverse momentum spectra and the ratio Rout/Raide Of HBT radii in the direction of the total transverse momentum of detected two particles (Rout) and perpendicular to both this direction and the beam direction (Rside) become a little steeper.
李建伟马余刚马国亮
轻核引起的中能重离子反应的核初态的形变和方向效应
利用同位旋相关的分子动力学(IQMD)模型,我们系统地研究了具有轴对称形变的长椭球结构的Mg+Mg的反应动力学,并且研究了反应动力学随着Mg的四极形变参数以及相对入射方向的变化。我们发现核的阻止本领、椭圆流以及碎片的电荷...
曹喜光张国强蔡翔舟马余刚陈金根方德清郭威田文栋王宏伟
关键词:中能重离子反应阻止本领
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中能重离子反应中类弹核自旋作用
中能重离子类弹核存在两种不同退激机制,类弹核多重碎裂和类弹核蒸发。为了弄清楚这两种机制的起源,我们采用HIPSE模型来研究中能核反应中类弹余核的产生及其碎片的分布。类弹核自旋对类弹核退激有一定的作用,当自旋大小在某一个临...
张国强曹喜光傅瑶马余刚蔡翔舟王宏伟方德清田文栋陈金根郭威刘桂华
关键词:核自旋相变
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Impact parameter and beam energy dependence for azimuthal asymmetry of direct photons and free protons in intermediate energy heavy-ion collisions
2009年
Hard photon emitted from energetic heavy ion collisions is of very interesting since it does not experience the late-stage nuclear interaction, therefore it is useful to explore the early-stage information of matter phase. In this work, we have calculated the impact parameter and beam energy dependence for azimuthal asymmetry, characterized by directed transverse flow parameter F and elliptic asymmetry coeffcient v2, of direct photons and the corresponding free protons in intermediate energy heavy-ion collisions. It is further shown the anti-correlated azimuthal asymmetry between direct photons and free protons.
刘桂华马余刚蔡翔舟方德清沈文庆田文栋王鲲
A new probe of neutron skin thickness
2011年
The correlation between neutron-to-proton yield ratio (Rnp) and neutron skin thickness (δnp) in neutron-rich projectile induced reactions is investigated within the framework of the Isospin-Dependent Quantum Molecular Dynamics (IQMD) model. The density distribution of the Droplet model is embedded in the initialization of the neutron and proton densities in the present IQMD model. By adjusting the diffuseness parameter of neutron density in the Droplet model for the projectile, the relationship between the neutron skin thickness and the corresponding Rnp is obtained. The results show strong linear correlation between Rnp and δnp for neutron-rich Ca and Ni isotopes. It is suggested that Rnp may be used as an experimental observable to extract δnp for neutron-rich nuclei, which is very interesting in the study of the nuclear structure of exotic nuclei, the equation of state (EOS) of asymmetric nuclear matter and neutron-rich matter in astrophysics, etc.
孙小艳方德清马余刚蔡翔舟陈金银郭威张国强周培
Hypertriton and light nuclei production at Λ-production subthreshold energy in heavy-ion collisions
2011年
High-energy heavy-ion collisions produce abundant hyperons and nucleons. A dynamical coales- cence model coupled with the ART model is employed to study the production probabilities of light clusters, deuteron (d), triton (t), helion (3He), and hypertriton (~H) at subthreshold energy of A production (= 1 GeV per nucleon). We study the dependence on the reaction system size of the coalescence penalty factor per additional nucleon and entropy per nucleon. The Strangeness Population Factor (S3 =3H/(3He ×∧/p)) shows an extra suppression of hypertriton comparing to light clusters of the same mass number. This model predicts a hypertriton production cross-section of a few μb in ^36Ar+^36Ar, ^40Ca+^40Ca and ^56Ni+^56Ni in 1 A GeV reactions. The production rate is as high as a few hypertritons per million collisions, which shows that the fixed-target heavy-ion collisions at CSR (Lanzhou/China) at A subthreshold energy are suitable for breaking new ground in hypernuclear physics.
张松陈金辉马余刚许长补蔡翔舟马国亮钟晨
关键词:HYPERONHYPERNUCLEI
Density effect of the neutron halo nucleus induced reactions in intermediate energy heavy ion collisions
2009年
Using an isospin-dependent quantum molecular dynamics (IQMD) model, we study the 15C induced reactions from 30—120 MeV/nucleon systematically. Here the valence neutron of 15C is assigned at both 1d5/2 and 2s1/2 states respectively in order to study the density effect of reaction mechanism. It is believed that the existent neutron halo structure at the 2s1/2 state of 15C will affect the light particle emission evidently. In our calculation, the different density distributions of 15C at two states are calculated by relativistic mean field (RMF) model and introduced in the initiation of IQMD model, respectively. It is found that some observables such as emission fragmentation multiplicity, emission neutron/proton ratio and emission neutrons’ kinetic energy spectrum are sensitive to the initial density distribution.
曹喜光陈金根马余刚方德清田文栋颜廷志蔡翔舟
关键词:RMF
Strange quark dynamics on hot dense matter under the extreme condition
2010年
Production and properties of φ-meson under the extreme hot dense matter which is formed in Au + Au collisions at RHIC energy have been briefly reviewed.The issues are focused on transverse momentum (p T ) spectra of φ,elliptic flow of φ,nuclear modification factor of φ,the ratio of Ω(p T )/φ(p T ) versus p T,the ratio of Ω(p T /3)/φ(p T /2) versus p T /n q,spin alignment of φ and the enhancement of φ etc.These observables give the significant information of the strange quark dynamics in hot dense matter under the extreme condition.
马余刚蔡翔舟陈金辉马国亮
关键词:QGPRHIC
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