PHOTO (C) ESTATE OF FRANCIS BELLO / SCIENCE PHOTO LIBRARY PHOTO (C) ESTATE OF FRANCIS BELLO / SCIENCE PHOTO LIBRARY
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Chen Ning Yang. Portrait of the Chinese-American physicist Chen Ning Yang (born 1922). In 1956, Yang and Tsung-Dao Lee showed that parity conservation (mirror-image symmetry) is violated in interactions via the weak nuclear force. This work won them the 1957 Nobel Prize for Physics. Yang and Lee also proposed that electron- and muon-type neutrinos are different, predicted the existence of the weak force carrier, the W boson, and indicated the existence of neutral weak currents. Photographed in 1956. NO ADVERTISING USAGE IN CONSUMER OR TRADE MAGAZINES WITHOUT PRIOR WRITTEN APPROVAL *****.
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