Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.121101
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- Italian Space Agency (ASI)
- Deutsches Zentrum fur Luft- und Raumfahrt (DLR)
- Swedish National Space Board
- Swedish Research Council
- Russian Space Agency (Roscosmos)
- Russian Foundation for Basic Research
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The satellite-borne experiment PAMELA has been used to make a new measurement of the cosmic-ray antiproton flux and the antiproton-to-proton flux ratio which extends previously published measurements down to 60 MeV and up to 180 GeV in kinetic energy. During 850 days of data acquisition approximately 1500 antiprotons were observed. The measurements are consistent with purely secondary production of antiprotons in the Galaxy. More precise secondary production models are required for a complete interpretation of the results.
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