A new radio‐frequency beam separator at Brookhaven National Laboratory has produced exposures of negative and positive K mesons at a momentum of 12.8 GeV/c, the largest momentum obtained to date with separated kaon beams. The separator, a joint project of the Brookhaven Accelerator Department and Yale University, was completed at the end of 1965. A similar instrument is in operation at CERN, producing kaon beams of 10 GeV/c. Before completion of the rf separator, Brookhaven used an electrostatic separator that produced kaon beams up to 5.5 GeV/c. The new facility will make possible studies of interactions of antiprotons, kaons, and pions at selected momenta between 7 and 18 GeV/c.

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