James Watson Cronin
Born	29 September 1931 (1931-09-29) (age 78) Chicago, Illinois, USA
Nationality	United States
Fields	Physics
Institutions	University of Chicago
Alma mater	Southern Methodist University University of Chicago (Ph.D.)
Known for	Nuclear physics
Notable awards	Nobel Prize in Physics

James Watson Cronin (born September 29, 1931) is an American nuclear physicist.

Cronin was born in Chicago, Illinois and attended Southern Methodist University in Dallas, Texas. Cronin and co-researcher Val Logsdon Fitch were awarded the 1980 Nobel Prize in Physics for a 1964 experiment that proved that certain subatomic reactions do not adhere to fundamental symmetry principles. Specifically, they proved, by examining the decay of kaons, that a reaction run in reverse does not merely retrace the path of the original reaction, which showed that the interactions of subatomic particles are not indifferent to time. Thus the phenomenon of CP violation was discovered.

Cronin is Professor Emeritus at the University of Chicago and a spokesperson emeritus for the Auger project. Cronin is a member of the Board of Sponsors of The Bulletin of the Atomic Scientists

[edit] External links

• Cronin's Nobel lecture on CP Symmetry Violation
• James Watson Cronin at Nobel-winners.com
• James Cronin at nobelprize.org
• the discovery of violations of fundamental symmetry principles in the decay of neutral K-mesons.
• Short biography at the University of Chicago

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