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奥村 拓馬*; 橋本 直; 他40名*
Physical Review Letters, 130(17), p.173001_1 - 173001_7, 2023/04
被引用回数:1 パーセンタイル:83.24(Physics, Multidisciplinary)To test bound-state quantum electrodynamics (BSQED) in the strong-field regime, we have performed high-precision X-ray spectroscopy of the 5-4 and 5-4 transitions (BSQED contribution of 2.4 eV 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 - 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.