Phys. Rev. Lett. 76, 3057–3060 (1996)Measurement of 0.25–3.2 GeV Antiprotons in the Cosmic RadiationReceived 30 August 1995; revised 4 December 1995; published in the issue dated 22 April 1996 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. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.3057
DOI:
10.1103/PhysRevLett.76.3057
PACS:
98.70.Sa, 14.20.Dh, 95.85.Ry
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