81 cm Saclay Bubble Chamber

[1] The team led by Bernard Gregory completed the construction of the chamber in 1960 and later it was moved to CERN and installed at the Proton Synchrotron (PS).

[5] The experiments with low-energy K− beams resulted in the systematic studies of quasi-elastic reactions on protons directly correlated to strange baryonic resonances.

The exposure to higher-energy beams allowed the first evidence of the anti Ξ particle and enabled the discovery and analysis of various mesonic and baryonic resonances.

[7] An interesting experiment with a K− beam at rest in hydrogen was also carried out to determine Σ-Λ parity, which turned out to be positive, proving the same nature of these particles.

[9] The experiments carried out involved not only most of the CERN member states at the time but also USA, India, Israel, Spain, Czechoslovakia and Poland.

The 81 cm Saclay Bubble Chamber on display at CERN.
Last photograph taken with the 81 cm Saclay Bubble Chamber. The mysterious presence of a fish casts serious doubt on the origin of all the bubbles and reflects physicists good sense of humour. The photo originates from the retirement celebration of this chamber held at CERN on 8 April 1971.