论文标题
通过电子捕获的激光辅助核激发理论
Theory of Laser-Assisted Nuclear Excitation by Electron Capture
论文作者
论文摘要
理论上在通过电子捕获的激光辅助核激发过程中研究了X射线离子和原子和核自由度的相互作用。在电子捕获的核激发过程中，一种入射电子将同时核激发的原子壳中的空缺重组。在这里，我们研究了特定情况，其中自由电子和所需的原子壳孔由X射线游离电子激光脉冲产生。我们基于Feshbach投影操作员形式主义制定理论描述，并考虑在Sacla X射线无电子激光器上进行数值实验性场景。我们以$^{229} \ text {th} $和14.4kevMössbauer的过渡为$^{57} \ text {fe text {fe} $在$^{229} \ text {th} $中激发29.2 keV核状态的数值结果。
The interplay of x-ray ionization and atomic and nuclear degrees of freedom is investigated theoretically in the process of laser-assisted nuclear excitation by electron capture. In the resonant process of nuclear excitation by electron capture, an incident electron recombines into a vacancy in the atomic shell with simultaneous nuclear excitation. Here we investigate the specific scenario in which the free electron and the required atomic shell hole are generated by an x-ray free electron laser pulse. We develop a theoretical description based on the Feshbach projection operator formalism and consider numerically experimental scenarios at the SACLA x-ray free electron laser. Our numerical results for excitation of the 29.2 keV nuclear state in $^{229}\text{Th}$ and the 14.4 keV Mössbauer transition in $^{57}\text{Fe}$ show low excitation rates but strong enhancement with respect to direct two photon nuclear excitation.
