Photographic Service CERN Courier vol 43 no 5 : June 2003 bubble chamber chambre à bulles 1960 1960 Fourteen charged secondary particles are visible, this being the highest multiplicity observed in about 6000 proton-proton collisions. Photographic Service bubble chamber chambre à bulles 1960 1960 CERN Courier vol 38 no 8 : November 1998 1960 1960 This image from 1960 is of real particle tracks formed in CERN's first liquid hydrogen bubble chamber to be used in experiments. It was a tiny detector by today's standards at only 32 cm in diameter. Negatively charged pions with an energy of 16 GeV enter from the left. One of them interacts with a proton in the liquid hydrogen and creates sprays of new particles, including a neutral particle (a lambda) that decays to produce the "V" of two charged particle tracks at the centre. Lower-energy charged particles produced in the interactions spiral in the magnetic field of the chamber. The invention of bubble chambers in 1952 revolutionized the field of particle physics, allowing real particle tracks to be seen and photographed, after releasing the pressure that had kept a liquid above its normal boiling point. 1971 1971 These images show real particle tracks from the annihilation of an antiproton in the 80 cm Saclay liquid hydrogen bubble chamber. A negative kaon and a neutral kaon are produced in this process, as well as a positive pion. The invention of bubble chambers in 1952 revolutionized the field of particle physics, allowing real tracks left by particles to be seen and photographed by expanding liquid that had been heated to boiling point. 1973 1973 This image is taken from one of CERN's bubble chambers and shows the decay of a positive kaon in flight. The decay products of this kaon can be seen spiraling in the magnetic field of the chamber. The invention of bubble chambers in 1952 revolutionized the field of particle physics, allowing real tracks left by particles to be seen and photographed by expanding liquid that has been heated to boiling point. CERN Bulletin 1 3 1977 1973 This image is of real particle tracks taken from the CERN 2 m liquid hydrogen bubble chamber and shows the production and decay of a negative omega particle. A negative kaon enters the chamber which decays into many particles, including a negative omega that travels a short distance before decaying into more particles. The invention of bubble chambers in 1952 revolutionized the field of particle physics, allowing real tracks left by particles to be seen and photographed by expanding liquid that had been heated to boiling point. CERN Bulletin 43/99 : 25 October 1999 (English) 1973 1973 This event shows real tracks of particles from the 1200 litre Gargamelle bubble chamber that ran on the PS from 1970 to 1976 and on the SPS from 1976 to 1979. In this image a neutrino passes close to a nucleon and reemerges as a neutrino. Such events are called neutral curent, as they are mediated by the Z0 boson which has no electric charge. 1978 1978 This event shows real particle tracks from the Big European Bubble Chamber (BEBC), which was used to observe neutrino and hadron beams between 1973 and 1984 from the PS and SPS accelerators. In this event a neutrino interacts with a proton producing an excited D meson. A labeled diagram is seen on the right as the particles spiral in the magnetic field of the detector. CERN Bulletin 1 18 Gargamelle lepton event CERN50 Golden Jubilee Photos 2004 1973 This event shows the real tracks produced in the 1200 litre Gargamelle bubble chamber that provided the first confirmation of a neutral current interaction. A neutrino interacts with an electron, the track of which is seen horizontally, and emerges as a neutrino without producing a muon. The discovery of the neutral current was announced in the CERN main auditorium in July 1973. CERN Courier 26 44 6 2004 1998 This artistically-enhanced image shows the tracks of real particles produced when a neutrino interacted in a liquid mixture of neon and hydrogen inside the Big European Bubble Chamber (BEBC) during the 1960s. The tracks become visible when bubbles form along the paths of the particles as a piston expands the liquid. A magnetic field is produced in the detector causing the particles to travel in spirals, allowing charge and momentum to be measured. Serge Dailler Physics 1999 1999 Serge Dailler Generalities Physics 1999 1999 holograpy bubble chamber HOBC HOLMES SPS 1983 1983 (left) the image of an event in the holographic bubble chamber HOBC as it appears on the HOLMES screen after a first mathematical treatment. (right) the corresponding line drawing. See Annual Report 1983 p. 63, Fig. 10. The event is from experiment NA25.