arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.06421physics.atom-ph
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高电荷态Th-229离子的电子桥激发

Electronic bridge excitation in highly charged Th-229 ions

Pavlo V. Bilous, Hendrik Bekker, Julian Berengut, Benedict Seiferle, Lars von der Wense, Peter G. Thirolf, Thomas Pfeifer, José R. Crespo López-Urrutia, Adriana Pálffy

摘要:

从理论上研究了高电荷态离子中8 eV $^{229m}$ Th异构体的电子桥激发机制。通过利用开放$4f$轨道的富能级方案和高电荷离子对抗光电离的鲁棒性,可以使用脉冲高强度光学激光通过将其耦合到电子壳层来有效地驱动核跃迁。我们展示了如何实现一个有前途的电子桥计划,在电子束离子阱从亚稳态的电子状态。这种设置将避免对可调谐真空紫外激光器的需要。根据我们的理论预测,确定异构体的能量与$10^{-5}$ eV的不确定性,可以实现在一天的测量时间使用现实的激光参数。

英文摘要:

The excitation of the 8 eV $^{229m}$Th isomer through the electronic bridge mechanism in highly charged ions is investigated theoretically. By exploiting the rich level scheme of open $4f$ orbitals and the robustness of highly charged ions against photoionization, a pulsed high-intensity optical laser can be used to efficiently drive the nuclear transition by coupling it to the electronic shell. We show how to implement a promising electronic bridge scheme in an electron beam ion trap starting from a metastable electronic state. This setup would avoid the need for a tunable vacuum ultraviolet laser. Based on our theoretical predictions, determining the isomer energy with an uncertainty of $10^{-5}$ eV could be achieved in one day of measurement time using realistic laser parameters.

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