A search for cosmic-ray antiprotons was recently performed with use of a balloon-borne superconducting-magnet spectrometer. A total of 46 antiproton candidates were observed in the rigidity interval from 5.6 to 12.5 GV/c. Of these events 18.3 are expected to be atmospheric and instrumentation background. The p̄p ratio is found to be (5.2±{}1.5) ×{}10^-4. This ratio is consistent with secondary production of antiprotons in the interstellar medium.
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Golden et al. (1979) studied this question.
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