The Gargamelle Bubble Chamber was a giant particle detector at CERN, designed mainly for the detection of neutrinos. With a diameter of nearly 2 meter and 4.8 meter in length. It held nearly 12 cubic meters of freon (CF3Br) and operated from 1970 to 1978 with a neutrino beam from the CERN Proton Synchrotron. Weak neutral currents were predicted in 1973 and confirmed shortly thereafter, in 1974.
For the experiment approximately 83,000 neutrino events were analysed, and 102 neutral current events observed. The sign of a neutral current event was an isolated vertex from which only hadrons were produced.