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首页> 外文期刊>Physical review, C >Superheavy nuclei in a microscopic collective Hamiltonian approach: The impact of beyond-mean-field correlations on ground state and fission properties
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Superheavy nuclei in a microscopic collective Hamiltonian approach: The impact of beyond-mean-field correlations on ground state and fission properties

机译：微观集体汉密尔顿方法中的过度核：超越平均关联对地态和裂变性能的影响

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摘要

The impact of beyond-mean-field effects on the ground state and fission properties of superheavy nuclei has been investigated in a five-dimensional collective Hamiltonian based on covariant density functional theory. The inclusion of dynamical correlations reduces the impact of the Z = 120 shell closure and induces substantial collectivity for the majority of the Z = 120 nuclei which otherwise are spherical at the mean-field level (as seen in the calculations with the PC-PK1 functional). Thus, they lead to a substantial convergence of the predictions of the functionals DD-PC1 and PC-PK1 which are different at the mean-field level. On the contrary, the predictions of these two functionals remain distinctly different for the N = 184 nuclei even when dynamical correlations are included. These nuclei are mostly spherical (oblate) in the calculations with PC-PK1 (DD-PC1). Our calculations for the first time reveal significant impact of dynamical correlations on the heights of inner fission barriers of super heavy nuclei with soft potential energy surfaces, the minimum of which at the mean-field level is located at spherical shape. These correlations affect the fission barriers of the nuclei, which are deformed in the ground state at the mean-field level, to a lesser degree.
机译：基于协助密度函数理论的五维集体汉密尔顿人，研究了超越核心对超核的地位和裂变性能的影响。包含动力相关减少了Z = 120壳闭合的影响，并诱导大多数Z = 120核的基本集成，否则在平均场水平处是球形的（如用PC-PK1功能在计算中所见） ）。因此，它们导致了在平均场级别不同的功能DD-PC1和PC-PK1的预测的实质收敛性。相反，即使包括动态相关性，对于N = 184核，这两个功能的预测仍然明显不同。这些核主要是使用PC-PK1（DD-PC1）的计算中的球形（扁圆形）。我们首次计算揭示了动态相关性对具有软势能表面的超重核的内裂变屏障的高度的显着影响，其中最小值在平均场水平处位于球形上。这些相关性影响核的裂变屏障，其在平均场级以地态变形，以较小程度。

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  • 来源
    《Physical review, C》 |2019年第6期|共10页
  • 作者

    Shi Z.; Afanasjev A. V; Li Z. P.; Meng J.;

  • 作者单位

    Beihang Univ Sch Phys &

    Nucl Energy Engn Beijing 100191 Peoples R China;

    Mississippi State Univ Dept Phys &

    Astron Mississippi State MS 39762 USA;

    Southwest Univ Sch Phys Sci &

    Technol Chongqing 400715 Peoples R China;

    Kyoto Univ Yukawa Inst Theoret Phys Kyoto 6068502 Japan;

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  • 正文语种 eng
  • 中图分类 原子核物理学、高能物理学;
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