Subthreshold antiproton production in nucleus-nucleus collisions.
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Antiproton production from the secondary process is studied for nucleus-nucleus collisions at energies which are below the threshold for its production from the nucleon-nucleon reaction in the free space. In an expanding fireball model, we determine the abundance from the fusion of pions and find that for collisions at 2.1 GeV/nucleon the antiproton to negative pion ratio is 5.510-7 and has a similar magnitude to that of the data. 1989 The American Physical Society.