BWhat changed
Blumer and colleagues measured the muonium 2S₁/₂–2P₃/₂ interval using microwave-induced depletion of a metastable beam and coincidence detection of Lyman-alpha photons. Five muonium scans with different powers, moderator gases and propagation directions gave 9871.0±7.0 MHz. Hydrogen reference measurements and simulated microwave fields supported the line-shape analysis. Combining the result with an earlier Lamb-shift measurement yielded an inferred 2P fine-structure interval of 10918.2±7.4 MHz.
Scientific scope
Blumer and colleagues measured the muonium 2S₁/₂–2P₃/₂ interval using microwave-induced depletion of a metastable beam and coincidence detection of Lyman-alpha photons. Five muonium scans with different powers, moderator gases and propagation directions gave 9871.0±7.0 MHz. Hydrogen reference measurements and simulated microwave fields supported the line-shape analysis. Combining the result with an earlier Lamb-shift measurement yielded an inferred 2P fine-structure interval of 10918.2±7.4 MHz. The uncertainty includes statistical and apparatus-model contributions, with waveguide misalignment the largest listed systematic effect. The inferred 2P interval shares an earlier experiment and is not a separate direct measurement. Printed statistical consistency, normalization and model conventions require clarification; the original data and analysis code were not independently replayed. Agreement with the authors’ QED benchmark applies at this experimental precision. Higher-flux beams, sub-MHz precision and new symmetry tests remained prospective. The linked 2025 theory table excludes a listed hyperfine correction; including that term reconciles its central values with the experimental paper’s quoted benchmarks. Its symmetry-test models and Ramsey precision estimates are prospective.
Evidence
The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. The uncertainty includes statistical and apparatus-model contributions, with waveguide misalignment the largest listed systematic effect. The inferred 2P interval shares an earlier experiment and is not a separate direct measurement. Printed statistical consistency, normalization and model conventions require clarification; the original data and analysis code were not independently replayed. Agreement with the authors’ QED benchmark applies at this experimental precision. Higher-flux beams, sub-MHz precision and new symmetry tests remained prospective. The linked 2025 theory table excludes a listed hyperfine correction; including that term reconciles its central values with the experimental paper’s quoted benchmarks. Its symmetry-test models and Ramsey precision estimates are prospective.
Contributors
- The named authors in the research record · SCIENCE: These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.
- Microwave spectroscopy of the muonium 2S1/2–2P3/2 fine structure interval (PRA113012817)
- Muonium fine structure: theory update, tests of Lorentz violation, and experimental prospects (EPJD79:24)
Provisional WRS assessment, edition 2026-10-28.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
Full scientific record · Browse contribution grades · Request a correction