基于双中心基的裂变碎片在断点处的总角动量分布
Total angular momentum distributions of fission fragments at scission in a 2-center basis
- Université Paris-Saclay（巴黎萨克雷大学）
- CEA（法国原子能和替代能源委员会）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文提出一种适用于双中心基组的新方法，计算240Pu断点处裂变碎片角动量分布，发现奇偶交错现象，并揭示其与八极形变和壳效应的关联。
AI中文摘要：
本文提出了一种新方法，用于计算裂变碎片的角动量分布，该方法适用于双中心轴对称基组，该基组用于求解Hartree-Fock-Bogoliubov方程以研究裂变。作为首次应用，我们使用Gogny D1S相互作用研究了240Pu在断点区域裂变碎片角动量分布的属性。这里，考虑了由新提出的Link和Drop方法生成的一维不对称绝热路径（能量最低路径）。本研究的主要结果是，在碎片通过断点过程中，两个碎片均出现奇偶角动量交错现象。随着碎片分离，奇J分量逐渐被抑制，导致偶J分量占据主导地位。这种行为与碎片内禀八极形变的快速减小系统性相关，该形变减小与更接近反射对称形状的恢复有关。最后，粒子数投影揭示了与特定碎片构型相关的壳效应在塑造碎片角动量分布中的作用。
英文摘要：
In this article, we propose a new method to calculate the angular momentum distribution of fis- sion fragments adapted to the case of 2-center axial basis used to solve the Hartree-Fock-Bogoliubov equations in view of fission studies. As a first application, we have studied the properties of the fission fragment angular momentum distribution in the scission area of 240Pu using the Gogny D1S interaction. Here, a one dimensional asymmetric and adiabatic path (the lowest in energy), gener- ated by the newly proposed Link and Drop methods, has been considered. The major result of this study is the appearance of an odd-even angular momentum staggering in both fragments when going through scission. The odd-J components are progressively suppressed as the fragments separate, leading to an increasing dominance of even-J components. This behavior is systematically correlated with the rapid reduction of the intrinsic octupole deformation of the fragments, asso- ciated with the restoration of a more nearly reflection-symmetric shape. Finally, particle-number projection reveals the role of shell effects associated with specific fragment configurations in shaping the fragment angular momentum distributions.
