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Gargamelle

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The Gargamelle, now on display at CERN Microcosm museum science garden.

Gargamelle was a giant bubble chamber detector at CERN, designed mostly for the detection of neutrinos. Built in France, with a diameter of nearly 2 meters and 4.8 meters in length, Gargamelle held nearly 12 cubic meters of freon (CF₃Br). It operated from 1970 to 1978 with a neutrino beam from the CERN Proton Synchrotron. It was used to make one of the most important discoveries ever made at CERN: the experimental observation of the weak neutral currents in 1973, shortly after their theoretical prediction.

For the experiment approximately 83,000 neutrino events were analysed, and 102 neutral current events observed. The signature of a neutral current event was an isolated vertex from which only hadrons were produced.

The name derives from the giantess Gargamelle in the works of François Rabelais; she was Gargantua's mother.

References

• The discovery of the weak neutral currents, CERN Courier
• Experimental Study of the High-energy Reactions Anti-muon-neutrino e → Antu-muon-neutrino e-, Anti-muon-neutrino N → mu + X in the Gargamelle Bubble Chamber. (In French) Farhad Rahimi (Strasbourg, CRN). CRN-HE-84-13, Dec 1982.
• The road to unification - Gargamelle and the discovery of Weak Neutral Currents

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