Observation of cosmic-ray antiprotons at energies below 500 MeV

Details Observation of cosmic-ray antiprotons at energies below 500 MeV Observation of cosmic-ray antiprotons at energies below 500 MeV

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phrvl..75.3792y&link_type=abstract

Physical Review Letters, Volume 75, Issue 21, November 20, 1995, pp.3792-3795

Physics

58

Scientific paper

A search for cosmic-ray antiprotons was performed using a balloon-borne experiment with a superconducting magnetic rigidity spectrometer (BESS). We have detected four antiprotons in the kinetic energy range between 300 and 500 MeV, the first antiprotons to be identified by a direct mass measurement. The corresponding p¯/p flux ratio at the top of the atmosphere is found to be 1.2+1.0-0.65×10-5. No antiprotons were observed in the range between 175 and 300 MeV, resulting in a 90% C.L. upper limit on the flux ratio of 2.9×10-5.

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