Cronin , James Watson
(1931–) American physicist
Cronin, who was born in Chicago, Illinois, was educated at the Southern Methodist University and at Chicago, where he obtained his PhD in 1955. After a period at the Brookhaven National Laboratory he moved to Princeton in 1958 and later served as professor of physics from 1965 until 1971 when he was appointed to a comparable chair at the University of Chicago.
In 1956 Tsung Dao Lee and Chen Ning Yang made the startling claim that parity (P) was not conserved in weak interactions. To the surprise of physicists their bold conjecture was confirmed in a matter of months. It was however widely assumed that in a reaction the combination of parity and a property called charge conjugation (C) was conserved. Cronin and Val Fitch, together with James Christenson and René Turlay, tested this CP conservation in 1964 by investigating the decay of neutral kaons. It was known that one type of kaon could decay into two pions; the other could not without violating CP conservation. Cronin and his colleagues discovered a small number of decays of the second type into two pions, clearly demonstrating that CP is violated.
The result is of fundamental interest for it is known that the combined properties of charge conjugation (C), parity (P), and time (T) are conserved – so that if CP is violated then the decay of the kaons is not symmetrical with respect to time reversal.
Cronin and Fitch shared the 1980 Nobel Prize for physics for this work.

Scientists. . 2011.

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  • Cronin, James Watson — ▪ American physicist born Sept. 29, 1931, Chicago, Ill., U.S.       American particle physicist, corecipient with Val Logsdon Fitch (Fitch, Val Logsdon) (q.v.) of the 1980 Nobel Prize for Physics for an experiment that implied that reversing the… …   Universalium

  • James Watson Cronin — James Cronin (2006) James Watson Cronin (* 29. September 1931 in Chicago) ist US amerikanischer Physiker. Cronin schloss 1951 seine Studien an der Southern Methodist University ab und ging für die weitere Ausbildung an die University of Chicago,… …   Deutsch Wikipedia

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  • James Watson — puede referirse a: James Dewey Watson, biólogo, premio Nobel estadounidense. James Watson Cronin, físico nuclear, premio Nobel estadounidense. Véase también James, (desambiguación). Watson, (desambiguación) …   Wikipedia Español

  • Physiknobelpreis 1980: James Watson Cronin — Val Logsdon Fitch —   Die amerikanischen Physiker wurden für die Entdeckung von Verletzungen fundamentaler Symmetrieprinzipien beim Zerfall der neutralen Kaonen ausgezeichnet.    Biografien   James Watson Cronin, * Chicago (Illinois) 29. 9. 1931; ab 1965 Professor… …   Universal-Lexikon

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  • James Cronin — James Watson Cronin en una presentación en la Universidad Nacional de Vietnam el 4 de agosto de 2006. James Watson Cronin (Chicago, 29 de septiembre de 1931), es un físico nuclear estadounidense. Biografía Nació en Chicago, Illinois …   Wikipedia Español

  • James Cronin — (2006) James Watson Cronin (* 29. September 1931 in Chicago) ist US amerikanischer Physiker. Cronin schloss 1951 seine Studien an der Southern Methodist University ab und ging für die weitere Ausbildung an die University of Chicago, wo er 1955 …   Deutsch Wikipedia

  • Cronin —   [ krəʊnɪn],    1) Archibald Joseph, englischer Schriftsteller, * Cardross (bei Dumbarton) 19. 7. 1896, ✝ Montreux 6. 1. 1981; war Arzt (u. a. im Bergbaugebiet von Wales; später in London), dann freier Schriftsteller in den USA und in der… …   Universal-Lexikon

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