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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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The Nobel Prize in
Physics 1968 - Luis Walter Alvarez
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