Rapidity distribution of protons from the potential version of UrQMD model and the traditional coalescence afterburner

Rapidity distribution of protons from the potential version of UrQMD model and the traditional coalescence afterburner
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UrQMD 模型潜在版本和传统聚结加力燃烧室的质子快速分布

DOI:
10.1007/s11433-015-5768-2
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发表时间:
2016-01
影响因子:
6.4
通讯作者:
Shen CaiWan
Shen CaiWan
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Li QingFeng;Wang YongJia;Wang XiaoBao;Shen CaiWan

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用一个考虑了预成强子和束缚重子的平均场势的UrQMD模型,借助于一个既考虑相对距离R 0又考虑相对动量P0的传统聚并加力燃烧室,可以较好地描述AGS能下E895质子数据和SPS能下NA 49净质子数据的快度分布,(3.8 fm,0.3 GeV/c)。由于洛伦兹变换使R 0的膨胀和P0的收缩之间存在很大的抵消作用,因此团簇中的相对论效应对自由(净)质子的快度分布几乎没有影响.使用Woods-Saxon函数而不是FOPI合作在SIS能量下看到的纯对数函数,可以很好地拟合SIS能量下的数据和AGS和SPS能量下的UrQMD计算结果。此外,我们还发现,对于中心Au+Au或Pb+Pb碰撞在顶部SIS,SPS和RHIC能量,在集群中的质子分数分别约为33%,10%和0.7%。
Rapidity distributions of both E895 proton data at AGS energies and NA49 net proton data at SPS energies can be described reasonably well with a potential version of the UrQMD in which mean-field potentials for both pre-formed hadrons and confined baryons are considered, with the help of a traditional coalescence afterburner in which one parameter set for both relative distanceR0and relative momentumP0, (3.8 fm, 0.3 GeV/c), is used. Because of the large cancellation between the expansion inR0and the shrinkage inP0through the Lorentz transformation, the relativistic effect in clusters has little effect on the rapidity distribution of free (net) protons. Using a Woods-Saxon-like function instead of a pure logarithmic function as seen by FOPI collaboration at SIS energies, one can fit well both the data at SIS energies and the UrQMD calculation results at AGS and SPS energies. Further, it is found that for central Au+Au or Pb+Pb collisions at top SIS, SPS and RHIC energies, the proton fractions in clusters are about 33%, 10%, and 0.7%, respectively.
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