强电磁场中的量子电动力学：类氦铀的亚态分辨K$α$跃迁能量
Quantum Electrodynamics in Strong Electromagnetic Fields: Substate Resolved K$α$ Transition Energies in Helium-like Uranium
AI总结：
该研究利用新型探测器在CRYRING@ESR上获取类氦铀X射线光谱，以近90 eV的分辨率准确测定其K$α$跃迁四分量能量，结果与强场束缚态QED计算吻合，不支持类氦系统实验与理论存在系统性偏差的观点。
摘要：
我们在CRYRING@ESR装置上使用新型金属磁量热仪探测器，记录了储存并经电子冷却的类氦铀（U$^{90+}$）的X射线光谱，其光谱分辨率接近90 eV，达到了前所未有的水平。这使得我们能够准确测定U$^{90+}$中K$α$跃迁的所有四个分量的能量。我们发现实验结果与强场条件下最先进的束缚态量子电动力学（QED）计算结果吻合良好。我们的结果不支持近年来备受争议的类氦系统中实验与理论存在系统性偏差的观点。
英文摘要：
Using novel metallic magnetic calorimeter detectors at the CRYRING@ESR, we recorded X-ray spectra of stored and electron cooled helium-like uranium (U$^{90+}$) with an unmatched spectral resolution of close to 90 eV. This allowed for an accurate determination of the energies of all four components of the K$α$ transitions in U$^{90+}$. We find good agreement with state-of-the-art bound-state QED calculations for the strong-field regime. Our results do not support any systematic deviation between experiment and theory in helium-like systems, the presence of which was subject of intense debates in recent years.
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