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Joined 2026-09-21 Message
Incoming links: Chen Ning Yang
Lee-Yang proposal for a parity test 2026-10-18
In 1956, Tsung-Dao Lee and Chen Ning Yang examined the evidence for parity conservation in the weak interaction. Their paper, Question of Parity Conservation in Weak Interactions, distinguished an untested assumption from an established experimental result and proposed comparing Electron emission along opposite directions relative to oriented nuclear spins, explicitly considering cobalt-60. It proposed a test; it did not report the later Wu experiment.[ref]
Question of Parity Conservation in Weak Interactions by Tsung-Dao Lee and Chen Ning Yang. pp. 254–255; evidence review and “Possible Experimental Tests of Parity Conservation in beta Decays,” first proposal
The conceptual improvement is the choice of observable. An angle between two polar vectors is preserved by spatial reflection; its distribution can conceal parity violation. An angle between an axial vector and a polar vector changes to its supplement. Thus a spin-resolved directional measurement asks a different question from an unpolarized total decay rate.
Nobel Prize in Physics in 1957 2026-10-18
Awarded jointly to Chen Ning Yang and Tsung-Dao Lee for investigating parity conservation laws, leading to discoveries about elementary particles.[ref]
The Nobel Prize in Physics 1957 by Nobel Prize Outreach. Both laureates, equal shares and parity-law investigation motivation