What is recorded here?
Schwinger reports a finite radiative correction to the electron spin magnetic moment after expressing electrodynamic interactions in terms of measured mass and charge, and compares it with contemporary atomic measurements. An electron behaves like a tiny magnet. Atomic measurements indicated that its spin-associated magnetism was slightly larger than the simplest expectation. This short letter explains how interaction with the radiation field can change that prediction while separating divergent mass and charge terms from a finite observable correction. It presents the magnetic-moment prediction and its comparison with measurements. The detailed theory was still being prepared; this record covers the specific announcement, not the whole later development of quantum electrodynamics.
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Scientific scope
Exact 1948 Physical Review short communication, beginning on printed 416 and continuing 417; original letter text/footnotes read on both PDF pages. Written 30 Dec 1947, published 15 Feb 1948. Weak matter-radiation interaction and a perturbative correction expressed using measured mass/charge; external magnetic-field application, not a nonperturbative/all-energy theorem. The selected text reports a fractional additional moment of about 0.001162. This account does not independently certify the exact symbolic coefficient or reproduce the complete calculation. Hyperfine and sodium/gallium comparisons are the author's use of earlier experimental results, not WRS remeasurements. Detailed theory explicitly in preparation; no full derivation/all-orders renormalizability proof, modern precision anomaly calculation, completed Lamb-shift theory or general scattering audit admitted. Adjacent letters on Ca 45 and silver, their figures/acknowledgments, are excluded. no experimental or independent scientific certification.
Read the original work
- Schwinger, On Quantum-Electrodynamics and the Magnetic Moment of the Electron, Phys.Rev.73,416(1948), original short letter
- APS publication record for Schwinger magnetic-moment letter
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People and systems
Julian Schwinger
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English catalogue narrative
Schwinger: a radiative correction to the electron magnetic moment
Schwinger reports a finite radiative correction to the electron spin magnetic moment after expressing electrodynamic interactions in terms of measured mass and charge, and compares it with contemporary atomic measurements.
An electron behaves like a tiny magnet. Atomic measurements indicated that its spin-associated magnetism was slightly larger than the simplest expectation. This short letter explains how interaction with the radiation field can change that prediction while separating divergent mass and charge terms from a finite observable correction. It presents the magnetic-moment prediction and its comparison with measurements. The detailed theory was still being prepared; this record covers the specific announcement, not the whole later development of quantum electrodynamics.
Scientific scope
Exact 1948 Physical Review short communication, beginning on printed 416 and continuing 417; original letter text/footnotes read on both PDF pages. Written 30 Dec 1947, published 15 Feb 1948. Weak matter-radiation interaction and a perturbative correction expressed using measured mass/charge; external magnetic-field application, not a nonperturbative/all-energy theorem. The selected text reports a fractional additional moment of about 0.001162. This account does not independently certify the exact symbolic coefficient or reproduce the complete calculation. Hyperfine and sodium/gallium comparisons are the author's use of earlier experimental results, not WRS remeasurements. Detailed theory explicitly in preparation; no full derivation/all-orders renormalizability proof, modern precision anomaly calculation, completed Lamb-shift theory or general scattering audit admitted. Adjacent letters on Ca 45 and silver, their figures/acknowledgments, are excluded. no experimental or independent scientific certification.
People and systems
Julian Schwinger