K12 beam at the East Hall

A view from above the k12 beam-line to the experiment where sigmic and antiprotonic atoms have been identified for the first time. The equipment receives an intense beam of negative particles from the beam-line, entering from below climbing vertically at 17°, which is fed by the slow ejected beam in the East experimental hall. Two large magnets curve the beam to the left and into the target. Measurement of the X-rays emerging from the target identify the exotic types of atom which are produced. When the experimental set up was complete it was covered above also by shielding because of the high radiation levels.