James Watson Cronin was an American particle physicist.
Cronin at the 2010 Lindau Nobel Laureate Meeting
Particle physics or high-energy physics is the study of fundamental particles and forces that constitute matter and radiation. The field also studies combinations of elementary particles up to the scale of protons and neutrons, while the study of combination of protons and neutrons is called nuclear physics.
Fermi National Accelerator Laboratory, USA
CMS detector for LHC