James Cronin

For the founder of Monkey World, see Jim Cronin.

James Watson Cronin
Cronin at the 2010 Lindau Nobel Laureate Meeting
Born	(1931-09-29) 29 September 1931 Chicago, Illinois, USA
Nationality	United States
Alma mater	Southern Methodist University University of Chicago (Ph.D.)
Known for	Nuclear physics
Awards	Nobel Prize in Physics John Price Wetherill Medal National Medal of Science
Scientific career
Fields	Physics
Institutions	University of Chicago

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 received the Ernest Orlando Lawrence Award in 1976 for major experimental contributions to particle physics including fundamental work on weak interactions culminating in the discovery of asymmetry under time reversal. In 1999, he was awarded the National Medal of Science.

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

Publications

• Banner, M.; Cronin, J. W.; Liu, J. K.; & J. E. Pilcher. "Measurement of the Branching Ratio K{sub L} → γ γ ∕ K{sub L} → 3π{sup 0}", Palmer Physical Laboratory, Princeton University, United States Department of Energy (through predecessor agency the Atomic Energy Commission), (August 12, 1968).

• Banner, M.; Cronin, J. W.; Liu, J. K.; & J. E. Pilcher. "Measurement of the Branching Ratio K{sub L} → 2π{sup 0} ∕ K{sub L} → 3π{sup 0}", Palmer Physical Laboratory, Princeton University, United States Department of Energy (through predecessor agency the Atomic Energy Commission), (August 14, 1968).

• Cronin, J. W.; Frisch, H. J.; Shochet, M. J.; Boymond, J. P.; Mermod, R.; Piroue, P. A.; & R. L. Sumner. "Atomic Number Dependence of Hadron Production at Large Transverse Momentum in 300 GeV Proton--Nucleus Collisions", Enrico Fermi Institute, University of Chicago, Joseph Henry Laboratories, Princeton University, United States Department of Energy (through predecessor agency the Atomic Energy Commission), National Science Foundation, (July 15, 1974).

• Brun, T. O.; Carpenter, J. M.; Krohn, V. E.; Ringo, G. R.; Cronin, J. W.; Dombeck, T. W.; Lynn, J. W.; & S. A. Werner. "Measurement of Ultracold Neutrons Produced by Using Doppler-shifted Bragg Reflection at a Pulsed-neutron Source", Argonne National Laboratory, University of Chicago, University of Maryland, College Park, University of Missouri, United States Department of Energy, (1979).

• Cronin, J. W.; Deshpande, N. G.; Kane, G. L.; Luth, V. C.; Odian, A. C.; Machacek, M. E.; Paige, F.; Schmidt, M. P.; Slaughter, J.; & G. H. Trilling. "Report of the Working Group on CP Violation and Rare Decays", University of Chicago, University of Oregon, University of Michigan, Stanford Linear Accelerator Center (SLAC), Northeastern University, Brookhaven National Laboratory (BNL), United States Department of Energy, (October 1984).

External links

• Biography and Bibliographic Resources, from the Office of Scientific and Technical Information, United States Department of Energy
• 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