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SUMMARY:Two Centenaries - the Wilson Cloud Chamber and the Discovery of Co
 smic Rays” - Professor Malcolm Longair ( Department of Physics\, Univeri
 ty of Cambridge)
DTSTART:20121010T150000Z
DTEND:20121010T160000Z
UID:TALK40682@talks.cam.ac.uk
CONTACT:Leona Hope-Coles
DESCRIPTION:In 1912\, CTR Wilson perfected his cloud chamber and Victor He
 ss discovered the cosmic radiation. The cloud chamber enabled the paths of
  energetic particles to be imaged for the first time and was at the heart 
 of many subsequent discoveries in particle physics. The extraordinary stor
 y of Wilson's brilliant experiments and the subsequent use of the cloud ch
 amber will be described. Wilson was involved in various aspects of the dis
 covery of the cosmic radiation. The dangerous balloon experiments by Hess 
 and Kolhorster\, which resulted in the discovery of cosmic rays\, will be 
 described and the story brought right up to date with the most recent resu
 lts from the International Pierre Auger Observatory in Argentina. The phys
 ics of the numerous problems posed by these observations will be reviewed.
LOCATION:Pippard Lecture Theatre\, Cavendish Laboratory
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