Initialization effects of nucleon profile on the π yields in heavy-ion collisions at medium energies
Initialization effects of nucleon profile on the π yields in heavy-ion collisions at medium energies
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DOI：
10.1088/1361-6471/ac1392
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发表时间：
2020-10
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影响因子：
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通讯作者：
Zu-Xing Yang;N. Michel;Xiao-Hua Fan;W. Zuo
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文献类型：
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作者：
Zu-Xing Yang;N. Michel;Xiao-Hua Fan;W. Zuo
在同位旋相关的Boltzmann-Uehling-Uhlenbeck（IBUU）输运模型下，研究了重离子碰撞中$\pi$的产生问题.我们使用两种不同的模型，Skyrme-Hartree-Fock（SHF）模型和组态相互作用壳模型（SM）产生的核子密度。事实上，核子间的相关性被明确地考虑在SM中，而它们在SHF模型中被平均。作为我们的理论框架的应用，我们计算了$A = 30-40$核子碰撞的$\pi^{-}$和$\pi^{+}$产额.我们使用不同的谐振子长度$B_{HO}$来产生SM的谐振子基，以研究理论和实验情况。结果表明，当$B {HO}$ = 2.5 fm时，可以用$\pi$介子的产额来区分SM框架和SHF框架，在这种情况下，由壳模型计算的密度分布在碰撞中产生更多的$\pi$.比较发现，当$B {HO}$ = 2.0 fm时，SM与SHF的大冲击参数的双$\pi^-/\pi^+$比值不同，SM的双$\pi^-/\pi^+$比值变化平缓，且小于SHF。
We study a problem of $\pi$ production in heavy ion collisions in the context of the Isospin-dependent Boltzmann-Uehling-Uhlenbeck (IBUU) transport model. We generated nucleon densities using two different models, the Skyrme-Hartree-Fock (SHF) model and configuration interaction shell model (SM). Indeed, inter-nucleon correlations are explicitly taken into account in SM, while they are averaged in the SHF model. As an application of our theoretical frameworks, we calculated the $\pi^{-}$ and $\pi^{+}$ yields in collisions of nuclei with $A = 30-40$ nucleons. We used different harmonic oscillator lengths $b_{HO}$ to generate the harmonic oscillator basis for SM in order to study both theoretical and experimental cases. It is found that SM framework with $b_{HO}$ = 2.5 fm and SHF can be distinguished by the yield of $\pi$ mesons, in this case the density distribution calculated by the shell model produces more $\pi$ in the collision. In comparison, SM with $b_{HO}$ = 2.0 fm is distinguished from SHF by the double $\pi^-/\pi^+$ ratios with different large impact parameters, from which one can find that the double $\pi^-/\pi^+$ ratios of SM change smoother and are less than those of SHF.