Expanding the limits of nuclear stability at finite temperature.
Expanding the limits of nuclear stability at finite temperature.
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DOI：
10.1038/s41467-023-40613-2
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发表时间：
2023-08-10
影响因子：
16.6
通讯作者：
Paar, Nils
中科院分区：
文献类型：
--
作者：
Ravlic, Ante;Yuksel, Esra;Niksic, Tamara;Paar, Nils
超新星或中子星合并等热恒星环境中的原子核特性很大程度上尚未被探索。由于人们对热核中有多少质子和中子可以结合在一起知之甚少，因此我们研究了有限温度下核存在的极限（滴水线）。在这里，我们使用相对论能量密度泛函理论 (REDF) 绘制了温度高达 200 亿开尔文左右的核滴线图，包括对连续体中核子热散射的处理。通过大量的计算工作，使用具有不同潜在相互作用的多个 REDF 确定滴水线，证明中子滴水线随着温度升高而发生相当大的变化，尤其是在幻数附近。在温度 T ≲ 120 亿开尔文时，核有效相互作用、配对和温度效应特性之间的相互作用决定了核结合。在较高温度下，我们发现了一个令人惊讶的结果，即由于热壳淬火，束缚核的总数随着温度的增加而增加。我们的研究结果提供了对热核的核景观的深入了解，揭示了核滴线应被视为随温度动态变化的限制。了解原子核的性质及其稳定性如何随温度变化是有趣且重要的。在这里，作者报告了他们对热核和限制有限温度下核存在的滴水线的理论研究。
Properties of nuclei in hot stellar environments such as supernovae or neutron star mergers are largely unexplored. Since it is poorly understood how many protons and neutrons can be bound together in hot nuclei, we investigate the limits of nuclear existence (drip lines) at finite temperature. Here, we present mapping of nuclear drip lines at temperatures up to around 20 billion kelvins using the relativistic energy density functional theory (REDF), including treatment of thermal scattering of nucleons in the continuum. With extensive computational effort, the drip lines are determined using several REDFs with different underlying interactions, demonstrating considerable alterations of the neutron drip line with temperature increase, especially near the magic numbers. At temperatures T ≲ 12 billion kelvins, the interplay between the properties of nuclear effective interaction, pairing, and temperature effects determines the nuclear binding. At higher temperatures, we find a surprizing result that the total number of bound nuclei increases with temperature due to thermal shell quenching. Our findings provide insight into nuclear landscape for hot nuclei, revealing that the nuclear drip lines should be viewed as limits that change dynamically with temperature. It is interesting and important to understand how the properties of nuclei and their stability change with temperature. Here the authors report their theoretical study of hot nuclei and the drip lines that limit the nuclear existence at finite temperature.
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影响因子：
1.4
作者：
BONCHE, P;LEVIT, S;VAUTHERIN, D
通讯作者：
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