Nobel Prize in Physics in 1955 2026-10-18
Awarded in equal shares to Willis Eugene Lamb Jr. for discoveries concerning the fine structure of the hydrogen spectrum and Polykarp Kusch for precision determination of the Electron magnetic moment.[ref]
The Nobel Prize in Physics 1955 by Nobel Prize Outreach. Individual official motivation, printed p. 281; PDF page 273, followed by presentation pp. 283–285