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How did cosmic rays contribute to the discovery of new particles?
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subatomic particle
The Large Hadron Collider (LHC), the world's most powerful particle accelerator. At the LHC, located underground in Switzerland, physicists study subatomic particles.
Between the early 1930s and the 1950s, cosmic rays served as the primary source of high-energy particles, enabling scientists to observe and identify various short-lived subatomic particles through high-energy collisions. This era of research effectively established the field of particle physics.1
Key discoveries and methods included:
- The Positron: In 1932, Carl David Anderson discovered the positron—the first identified antiparticle—by analyzing cosmic ray tracks within a cloud chamber.2
- The Muon: Cosmic ray studies also led to the discovery of the muon, a subatomic particle that researchers observed as a secondary product of cosmic ray interactions.1
- Detection Techniques: Scientists utilized specialized tools to record these events, such as nuclear photographic emulsions. These plates allowed researchers to capture and study the individual tracks of charged particles, which was instrumental in the 1947 discovery of the pion.34
Even after the development of powerful particle accelerators, cosmic rays remain a vital subject of study because they contain particles with energy levels far exceeding those achievable in laboratory settings.1