排序方式: 共有10条查询结果,搜索用时 15 毫秒
1
1.
2.
HBT参数对π源空间分布的敏感性研究(英文) 总被引:1,自引:1,他引:0
利用理想高斯源的两粒子关联函数,对单高斯源和双高斯源的两π介子HBT关联效应进行了研究,得出了相应的半径参数和A参数.结果表明,半径参数主要取决于高能重离子碰撞中多数π介子产生的中间区域;对产生π介子的边缘区域的空间分布形状不敏感.在边缘区域内产生的π介子主要影响A参数的变化.π介子源空间分布的非高斯形是导致λ参数减少的一个重要因素.The HBT radius parameters and the HBT λ-parameters of single Gaussian source and double Gaussian source are investigated by using two-pion correlation function in HBT intensity interferometry. It is indicated that the radius parameter is insensitive to the spatial shape of the edge zone of source and is mainly affected by the size of the central zone of pions emitted in high energy heavy-ion collisions. The pions produced at the edge of source influence the λ parameter. The non-Gaus... 相似文献
3.
The non-central Au+Au collision at center-of-mass energy √sNN=200 GeV is simulated using AMPT model. It is found that both the integral and differential elliptic flow behaves differently for partons freezing out at different stages. It is shown that the integral elliptic flow of freeze-out partons decreases with time at the early stage, but increases with time at the late stage. The curve of transverse momentum distribution of elliptic flow of partons is more flatter at the early stage than at the late stage. The effect of surface emitting on elliptic flow is argued to be not neglectable. 相似文献
4.
Based on a hydro-inspired azimuthally symmetric emission function, we analyze the HBT radius Rs and the single-particle transverse momentum spectra in Au+Au collisions measured by the STAR Collaboration at √sNN=200 GeV. The results show that consistent assumptions about transverse density (and/or flow profile) in the calculation of the HBT radius Rs and single-particle spectral analyses play an important role for understanding the size of the freeze-out source. 相似文献
5.
6.
The predictions of the directed collective flow by using the relativistic quantum molecular dynamics model are presented for the heavy-ion reactions at HIRFL-CSR energies. The directive flow value as a function of the emitting nucloen rapidity in the center-of-mass system is calculated with the azimuthal 相似文献
7.
8.
9.
A method for investigating the azimuthal correlations between directed and elliptic flow in heavy ion collisions is described. The transverse anisotropy of particle emission at AGS energies is investigated within the RQMD model. It is found that the azimuthal correlations between directed and elliptic flow are sensitive to the incident energy and impact parameter. The fluctuations in the 相似文献
10.
The integral and differential elliptic flow of partons is calculated using the multiphase transport model for Au+Au collisions at centre-of-mass energy √SNN=200 GeV. It is shown that elliptic flow of partons freezing out at early time, which is affected mainly by surface emittance, decreases with time and elliptic flow of partons freezing out at late time, which is dominated by cumulative collisions, increases with time. The elliptic flow of partons freezing out early has a large contribution to the flatting of curve of final differential elliptic flow at large transverse momentum. It is argued that the effect of surface emittance is not neglectable. 相似文献
1