重构准则对对称势灵敏探针的影响
The influence of reconstruction criteria on the sensitive probes of the symmetry potential
摘要：
利用改进的UrQMD输运模型讨论了从中能丰中子HIC中构造团簇和追溯$Δ$共振的不同判据。结果表明，在小横动量时，相空间判据和坐标密度判据对自由核子的单、双中子/质子比都有影响，但在大横动量时，这种影响就不明显了.在大的动能区域中，重建冻结出的$Δ$的不同方法对$Δ^0/Δ^{++}$比率的影响很强。
英文摘要：
Different criteria of constructing clusters and tracing back $Δ$ resonances from the intermediate-energy neutron-rich HICs are discussed by employing the updated UrQMD transport model. It is found that both the phase-space and the coordinate-density criteria affect the single and the double neutron/proton ratios of free nucleons at small transverse momenta, but the influence becomes invisible at large transverse momenta. The effect of different methods of reconstructing freeze-out $Δ$s on the $Δ^0/Δ^{++}$ ratio is strong in a large kinetic energy region.
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