有限密度$^{229}$Th中电子俘获核激发的电子结构控制
Electronic-Structure Control of Nuclear Excitation by Electron Capture in Finite-Density $^{229}$Th
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中文总结 AI 辅助
本研究通过有限温度平均原子模型和粒子模拟，揭示稠密环境中电子结构对$^{229}$Th核激发共振俘获通道的调控作用，显著影响NEEC产额。
中文摘要 AI 辅助
电子俘获核激发（NEEC）为耦合电子和核动力学提供了独特途径，但其在稠密物质中的描述通常依赖于孤立离子的电子结构。在此，我们展示了稠密环境如何重塑可用的NEEC俘获通道。利用有限温度平均原子模型，我们通过联合考虑电子局域化、共振能量匹配和空位可用性来评估通道可用性。在接近固体密度时，浅层$6p$态保持足够局域化以支持驱动$^{229}$Th中8.356-eV同核异能跃迁的共振电子俘获，而更高类价态则合并入连续谱，不再构成局域化俘获通道。不同温度和密度下的计算揭示了由压力诱导退局域化、共振能量移动和空位形成之间相互作用产生的不同通道可用性窗口。将重构通道与激光驱动$^{229}$Th的粒子模拟耦合进一步表明，有限密度下的电子结构可显著改变预测的累积NEEC产额。这些结果证明了电子环境如何控制共振俘获途径，强调了其在稠密物质中电子驱动核激发中的关键作用。
英文摘要
Nuclear excitation by electron capture (NEEC) provides a unique pathway for coupling electronic and nuclear dynamics, but its description in dense matter commonly relies on electronic structures of isolated ions. Here we show how dense environments reshape the available NEEC capture channels. Using a finite-temperature average-atom model, we assess channel availability by jointly considering electronic localization, resonance energy matching, and vacancy availability. Near solid density, the shallow $6p$ states remain sufficiently localized to support resonant electron capture that drives the 8.356-eV isomeric transition in $^{229}$Th, whereas higher valence-like states merge into the continuum and no longer constitute localized capture channels. Calculations at different temperatures and densities reveal distinct windows of channel availability arising from the interplay among pressure-induced delocalization, shifts in resonance energy, and vacancy formation. Coupling the reconstructed channels to particle-in-cell simulations of laser-driven $^{229}$Th further shows that electronic structure at finite density can substantially alter the predicted cumulative NEEC yield. These results demonstrate how the electronic environment governs resonant capture pathways, highlighting its essential role in nuclear excitation driven by electrons in dense matter.
发表机构
- College of Science, National University of Defense Technology（国防科技大学理学院）
- Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology, Center for Intense Laser Application Technology, and College of Engineering Physics, Shenzhen Technology University（深圳技术大学工程物理学院，超强激光前沿应用技术与材料技术深圳市重点实验室）
- Southwestern Institute of Physics（西南物理研究所）
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