Atomic, Molecular, and Optical Physics Laboratory, RIKEN, Wako 351-0198, Japan.
National Institute of Standards and Technology, Boulder, Colorado 80305, USA.
Phys Rev Lett. 2023 Apr 28;130(17):173001. doi: 10.1103/PhysRevLett.130.173001.
To test bound-state quantum electrodynamics (BSQED) in the strong-field regime, we have performed high precision x-ray spectroscopy of the 5g-4f and 5f- 4d transitions (BSQED contribution of 2.4 and 5.2 eV, respectively) of muonic neon atoms in the low-pressure gas phase without bound electrons. Muonic atoms have been recently proposed as an alternative to few-electron high-Z ions for BSQED tests by focusing on circular Rydberg states where nuclear contributions are negligibly small. We determined the 5g_{9/2}- 4f_{7/2} transition energy to be 6297.08±0.04(stat)±0.13(syst) eV using superconducting transition-edge sensor microcalorimeters (5.2-5.5 eV FWHM resolution), which agrees well with the most advanced BSQED theoretical prediction of 6297.26 eV.
为了在强场 regime 中检验束缚态量子电动力学（BSQED），我们对低气压气相中无束缚电子的μ子氖原子的 5g-4f 和 5f-4d 跃迁（BSQED 贡献分别为 2.4 和 5.2 eV）进行了高精度的 X 射线光谱学研究。μ子原子最近被提议作为替代少数电子高 Z 离子的选择，用于 BSQED 测试，方法是关注核贡献可以忽略不计的圆形里德堡态。我们使用超导转变边缘传感器微热量计（5.2-5.5 eV FWHM 分辨率）确定了 5g_{9/2}-4f_{7/2}跃迁能量为 6297.08±0.04(stat)±0.13(syst) eV，这与最先进的 BSQED 理论预测值 6297.26 eV 非常吻合。
