Global properties of nuclei at finite-temperature within the covariant energy density functional theory
Global properties of nuclei at finite-temperature within the covariant energy density functional theory
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DOI：
10.1103/physrevc.109.014318
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发表时间：
2023-09
影响因子：
3.1
通讯作者：
A. Ravli'c;E. Yüksel;T. Nikšić;Nils Paar
中科院分区：
文献类型：
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作者：
A. Ravli'c;E. Yüksel;T. Nikšić;Nils Paar
在恒星环境中，原子核在有限的温度下出现，在核心塌缩的超新星和中子星合并中变得非常热。然而，由于理论和计算的复杂性，大多数核性质的模型计算都是在零温度下进行的，而那些在有限温度下存在的模型计算仅限于核素图中选定的区域。在这项研究中，我们对偶-偶$8\leq Z\leq 104$核的核性质进行了全局计算，温度范围为$0\le T\lee 2$MeV。计算基于有限温度相对论Hartree-Bogoliubov模型，辅以Bonche-Levit-Vautherin蒸气减法。我们发现在中子滴线附近，连续态在中温T约为1 MeV时已有显著贡献，从而强调了蒸汽减去过程的必要性。结果包括中子发射寿命、四极形变、中子皮厚度、质子和中子配对能隙、熵和激发能。在温度为$T\约1$MeV的温度范围内，有限温度效应主要是通过降低配对关联，对核图的影响很小。随着温度的进一步升高，对核结构的影响变得明显，形变和壳效应都减小了。
In stellar environments nuclei appear at finite temperatures, becoming extremely hot in core-collapse supernovae and neutron star mergers. However, due to theoretical and computational complexity, most model calculations of nuclear properties are performed at zero temperature, while those existing at finite temperatures are limited only to selected regions of the nuclide chart. In this study we perform the global calculation of nuclear properties for even-even $8 \leq Z \leq 104$ nuclei at temperatures in range $0\le T \le 2$ MeV. Calculations are based on the finite temperature relativistic Hartree-Bogoliubov model supplemented by the Bonche-Levit-Vautherin vapor subtraction procedure. We find that near the neutron-drip line the continuum states have significant contribution already at moderate temperature $T\approx 1$ MeV, thus emphasising the necessity of the vapor subtraction procedure. Results include neutron emission lifetimes, quadrupole deformations, neutron skin thickness, proton and neutron pairing gaps, entropy and excitation energy. Up to the temperature $T\approx 1$ MeV nuclear landscape is influenced only moderately by the finite-temperature effects, mainly by reducing the pairing correlations. As the temperature increases further, the effects on nuclear structures become pronounced, reducing both the deformations and the shell effects.