Observing the World of Particles
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The Bubble Chamber

The 2m Hydrogen Filled Bubble Chamber

A photograph from the 2m hydrogen filled bubble chamber at CERN, the European Laboratory of Particle Physics at Geneva. Five K- mesons enter the chamber from bottom and one of them interacts with a proton in the chamber. The momentum of the K-mesons is 10 GeV/c which makes them very relativistic – 99.9% of the velocity of light! In the interaction (reconstruction of the interaction to the right) a very rare  particle, containing three strange quarks, is produced. The magnetic field bends the charged particles. The  decays after about 10 cm in the chamber into one particle (neutral) and one K-. The white crosses (+) are marks fixed to the chamber that help the three dimensional reconstruction.


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