Evidence for the Existence of Cosmic-Ray Antiprotons
Abstract
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 p¯p ratio is found to be (5.2+/-1.5) ×10-4. This ratio is consistent with secondary production of antiprotons in the interstellar medium.
- Publication:
-
Physical Review Letters
- Pub Date:
- October 1979
- DOI:
- 10.1103/PhysRevLett.43.1196
- Bibcode:
- 1979PhRvL..43.1196G
- Keywords:
-
- Antiprotons;
- Cosmic Rays;
- Interstellar Matter;
- Particle Production;
- Balloon Flight;
- Balloon-Borne Instruments;
- Data Acquisition;
- Energetic Particles;
- Histograms;
- Spectrometers;
- Superconducting Magnets;
- Space Radiation