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arXiv 2308.16634nucl-thnucl-ex
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初始态几何构型对核液气相变的影响

Effect of initial-state geometric configurations on the nuclear liquid-gas phase transition

Y. T. Cao, X. G. Deng, Y. G. Ma

AI总结:

本研究通过扩展量子分子动力学模型模拟不同α团簇构型的$^{16}$O与$^{40}$Ca碰撞,发现几何涨落影响轻核产额,且$\mathcal{O}_\text{p-d-t}$在80-100 MeV/核子处峰值与液气相变相关。

摘要:

在扩展量子分子动力学模型框架内,我们模拟了束流能量范围为60至150 MeV/核子、具有不同α团簇构型的$^{16}$O与$^{40}$Ca的碰撞。结果表明,不同的α团簇构型导致氘核、氚核、$^3$He和$^4$He产额不同,但对质子和中子产额无影响。我们讨论了由轻核双比率(即$\mathcal{O}_\text{p-d-t}$和$\mathcal{O}_\text{p-d-He}$)呈现的几何涨落效应。研究发现,几何涨落的幅度大小顺序为$^{16}$O的链状、风筝状、方形和四面体结构。$\mathcal{O}_\text{p-d-t}$在约80--100 MeV/核子处具有最大值,这可能与液气相变相关,这与碰撞中最重碎片电荷分布的结果一致。

英文摘要:

Within the framework of an extended quantum molecular dynamics model, we simulated $^{40}$Ca + $^{16}$O collisions at beam energies ranging from 60 to 150 MeV/nucleon for $^{16}$O with different $α$-cluster configurations. Results imply that different $α$-cluster configurations lead to different yields of deuteron, triton, $^3$He and $^4$He, but not for proton and neutron. We discuss the effect of geometric fluctuations which are presented by double ratios of light nuclei, namely $\mathcal{O}_\text{p-d-t}$ and $\mathcal{O}_\text{p-d-He}$. It is found that magnitude hierarchy of geometric fluctuations is chain, kite, square and tetrahedron structure of $^{16}$O. $\mathcal{O}_\text{p-d-t}$ has maximum value around 80 -- 100 MeV/nucleon which could be related to liquid-gas phase transition, that is consistent with results from the charge distribution of the heaviest fragments in the collisions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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