发表机构
Kyoto University; RIKEN; Sun Yat-sen University（京都大学; 理化学研究所; 中山大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过协变密度泛函理论和高斯过程仿真器，系统分析了表面能系数与裂变势垒高度的强关联，并揭示了外、内势垒分别由耦合常数δ_V及其联合效应主导。
AI 中文摘要
我们系统研究了核裂变性质与从半无限核物质中提取的表面能系数$a_{\rm surf}$之间的关联。为此，我们采用了基于点耦合能量密度泛函（EDF）的协变密度泛函理论。以$^{240}$Pu和$^{236}$U为代表，我们使用高斯过程仿真器构建了$a_{\rm surf}$与选定裂变观测量在受这两个核基态性质约束下的联合后验分布。结果表明，$a_{\rm surf}$与裂变势垒高度之间存在强关联。进一步的敏感性分析显示，外裂变势垒的高度主要由点耦合EDF中的同位旋标量-矢量导数耦合常数$\delta_V$决定，而内势垒的高度则由$\delta_V$与多个相互关联的耦合常数的联合效应决定。
英文摘要
We systematically investigate the correlations between nuclear fission properties and the surface energy coefficient $a_{\rm surf}$ extracted from semi-infinite nuclear matter. To this end, we employ the covariant density functional theory based on a point-coupling energy density functional (EDF). Taking $^{240}$Pu and $^{236}$U as representative examples, we employ Gaussian-process emulators to construct the joint posterior distributions of $a_{\rm surf}$ and selected fission observables, constrained by the ground state properties of the two nuclei. The results reveal a strong correlation between $a_{\rm surf}$ and the fission barrier heights. A sensitivity analysis further shows that the height of the outer fission barrier is governed predominantly by the isoscalar-vector derivative coupling constant $δ_V$ in the point-coupling EDF, whereas that of the inner barrier is by the combined effects of $δ_V$ and several mutually correlated coupling constants.
Comments14 pages and 6 figures in the main text, 9 pages and 9 figures in the Supplemental material
