A storage device in which particles collide over their entire orbit can be used for pi‐pi collision experiments, according to Paul L. Csonka of the University of Oregon. Such devices have been talked about for several years. Csonka's apparatus, which he calls a “miniring,” could, for example, be used with a proposed proton storage ring at the Los Alamos Meson Physics Facility, to give 10 to 70 events per hour. Doing a conventional colliding‐beam experiment with two pion beams, one would have to wait ten million years to see an event.

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