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VOLUME 46 (1987) | ISSUE 6 | PAGE 219
Below-threshold and near-threshold production of antiprotons in collisions with nuclei
Measurements of the inclusive cross section E{d ъа/й ър) for the production of antiprotons in proton-nucleus collisions are reported. The results show that most of the antiprotons are produced in direct reactions at a kinetic energy > 4.5 GeV of the accelerated protons. Estimates of the numbers of twoand three-nucleon clusters in Be, Al, and Cu nuclei are reported.