At WA11

Starting with february 1977 the WA5 spectrometer of the Indiana-Saclay Collaboration originally designed to study hadron backward scattering on protons, and later modified by the Indiana-Imperial College (London)-Saclay-Southampton Collaboration, was used (experiment WA11) to search for high mass states produced with the J/psi. On the left, Tom Marshall moves in a beam hodoscope. On the right, at the entrance of the Goliath magnet, one sees the 1 m long hydrogen target. (Later the set-up was reshuffled, and the hydrogen target was replaced by a set of Be targets located upstream of the magnet.)