Measurement of 0.25-3.2 GeV antiprotons in the cosmic radiation

J.W. Mitchell, L.M. Barbier, E.R. Christian, J.F. Krizmanic, K. Krombel, J.F. Ormes, R.E. Streitmatter, A.W. Labrador, A.J. Davis, R.A. Mewaldt, S.M. Schindler, R.L. Golden, S.J. Stochaj, W.R. Webber, W. Menn, M. Hof, O. Reimer, M. Simon, Ib Lundgaard Rasmussen

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Abstract

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 similar to 10(7) yr.
Original languageEnglish
JournalPhysical Review Letters
Volume76
Issue number17
Pages (from-to)3057-3060
ISSN0031-9007
DOIs
Publication statusPublished - 1996

Bibliographical note

Copyright (1996) American Physical Society.

Keywords

  • RAY
  • PROTON RATIO
  • MODULATION
  • SPECTROMETER

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