Low energy antiprotons in the cosmic rays: A new upper limit

Details Low energy antiprotons in the cosmic rays: A new upper limit Low energy antiprotons in the cosmic rays: A new upper limit

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989hyint..44...97a&link_type=abstract

Hyperfine Interactions, Volume 44, Issue 1-4, pp. 97-103

Physics

Scientific paper

Kinematics predicts the severe suppression of low-energy (<1 GeV) secondary antiprotons in the Galactic cosmic rays. Thus the observation several years ago of a finite flux of low-energy antiprotons could not be explained with existing models of cosmic ray propagation, which led to a plethora of theoretical speculation. We have recently flown a balloon-borne instrument to measure the energy spectrum of cosmic-raybar p's, and have found no antiprotons in the energy interval 200 640 MeV (corrected to the top of the atmosphere). This yields an upper limit to thebar p/p ratio of 5.5×10-5 (90% confidence level), well below and hence contradicting the earlier result.

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