arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.09773nucl-th
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核物质中具有团簇结构的轻$p$壳核($4 \le A \le 16$)

Light $p$-shell nuclei with cluster structures ($4 \le A \le 16$) in nuclear matter

Gerd Röpke

摘要:

计算了包括$1p$壳层核$4 \le A \le 16$在内的热致密核物质的组成.介质中的位移,特别是泡利阻塞,由核的内禀波函数决定。结果内壳模型的核子波函数的方法。壳模型并不总是能很好地描述轻核。“成簇的”核$^8$ Be由于$α$样成簇而表现出强的相关效应.本征簇结构对于核$^6$ Li、$^7$ Li、$^7$ Be和$^9$ Be也是重要的。相对稀有的元素Li、Be和B在饱和密度附近对物质状态方程(EoS)的贡献在简单的方法(例如核统计平衡(NSE)模型)中被高估。这两个,治疗的连续相关性和帐户的介质中的修改被认为是$^5$他和$^4$ H集群的贡献。与包括不稳定核的扩展NSE相比,由于Pauli阻断效应,相应的具有$A=5, Z=2$的P $_{3/2}$通道和具有$A=4, Z=1$的P $_{2}$通道对EoS的贡献分别在高密度下被强烈抑制。对于轻$p$壳层核结合能的移动,给出了在较宽的参数范围内计算热重物质组成的简单拟合公式。

英文摘要:

The composition of hot and dense nuclear matter is calculated including the $1p$-shell nuclei $4 \le A \le 16$. In-medium shifts, in particular Pauli blocking, are determined by the intrinsic wave function of the nuclei. Results are given within a shell-model approach for the nucleon wave function. Light nuclei are not always well described by the shell model. The 'clustered' nucleus $^8$Be exhibits strong correlation effects because of $α$-like clustering. Intrinsic cluster structures are also significant for the nuclei $^6$Li, $^7$Li, $^7$Be, and $^9$Be. The contribution of the relatively rare elements Li, Be, and B, to the equation of state (EoS) of matter near the saturation density is overestimated in simple approaches such as the nuclear statistical equilibrium (NSE) model. Both, the treatment of continuum correlations and the account of in-medium modifications are considered for the contribution of $^5$He and $^4$H clusters. Compared to the extended NSE including unstable nuclei, the contributions of the corresponding P$_{3/2}$ channel with $A=5, Z=2$ and P$_{2}$ channel with $A=4, Z=1$, respectively, to the EoS are strongly suppressed at high densities owing to Pauli blocking effects. For the shifts of the binding energies of the light $p$-shell nuclei, simple fit formula are given to calculate the composition of hot and dense matter in a wide parameter range.

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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