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arXiv 1906.02592nucl-thnucl-ex
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$\sqrt{s_{\rm{NN}}}=200$ GeV上Cu+Cu碰撞中轻(反)核的产生

Light (anti)nuclei production in Cu+Cu collisions at $\sqrt{s_{\rm{NN}}}=200$GeV

Liu Feng-Xian, Chen Gang, She Zhi-Lei, Zhou Dai-Mei, Xie Yi-Long

摘要:

基于PACIAE模型产生的末态强子,采用动力学约束相空间聚并模型研究了$\sqrt{s_{\rm{NN}}}=200$ GeV的Cu+Cu碰撞中轻(反)核的产生.其中,$|η|<0.5$和$0<p_T<8$ GeV/c.结果表明,$\rm d$、$\rm\overline d$、$\rm ^3He$、$\rm^3\overline {He}$、$\rm ^4He$和$\rm^4\overline {He}$的产率具有很强的中心依赖性,即,它们的产额随中心度的增加而迅速下降,质量越大,这种依赖性越大,而反核/核比和聚并参数PDMATHAMV随中心度的增加而保持不变.此外,(反)核的产额强烈地依赖于(反)核的质量,这表明在高能重离子碰撞中产生的(反)核具有质量标度性质。我们的结果与STAR的实验数据相一致。

英文摘要:

The production of light (anti)nuclei have been investigated using the dynamically constrained phase-space coalescence model based on the final-state hadrons generated by the PACIAE model in Cu+Cu collisions at $\sqrt{s_{\rm{NN}}}=200$GeV with $|η|<0.5$ and $0<p_T<8$GeV/c. The results show that there is a strong centrality dependence of yields of $\rm d$, $\rm\overline d$, $\rm ^3He$, $\rm^3\overline {He}$, $\rm ^4He$, and $\rm^4\overline {He}$, i.e., their yields decrease rapidly with the increase of centrality, and the greater the mass is, the greater the dependence shows; whereas their ratio of antinucleus to nucleus and coalescence parameter $B_A$ remain constant as the centrality increases. In addition, the yields of (anti)nuclei are strongly dependent on the mass of the (anti)nuclei, indicating that the (anti)nuclei produced have mass scaling properties in high-energy heavy-ion collisions. Our results are consistent with the STAR experimental data.

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