Measurement of 0.25-3.2 GeV Antiprotons in the Cosmic Radiation

Details Measurement of 0.25-3.2 GeV Antiprotons in the Cosmic Radiation Measurement of 0.25-3.2 GeV Antiprotons in the Cosmic Radiation

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996phrvl..76.3057m&link_type=abstract

Physical Review Letters, Volume 76, Issue 17, April 22, 1996, pp.3057-3060

Physics

91

Scientific paper

The balloon-borne Isotope Matter-Antimatter Experiment (IMAX) was flown from Lynn Lake, Manitoba, Canada on 16-17 July 1992. Using velocity and magnetic rigidity to determine mass, we have directly measured the abundances of cosmic ray antiprotons and protons in the energy range from 0.25 to 3.2 GeV. Both the absolute flux of antiprotons and the antiproton/proton ratio are consistent with recent theoretical work in which antiprotons are produced as secondary products of cosmic ray interactions with the interstellar medium. This consistency implies a lower limit to the antiproton lifetime of ~107 yr.

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