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Related Experiment Videos

First Mass-resolved Measurement of High-Energy Cosmic-Ray Antiprotons.

Bergström, Boezio, Carlson

    The Astrophysical Journal
    |May 17, 2000
    PubMed
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    Cosmic-ray antiproton-to-proton ratio measurements confirm secondary interstellar production. New data provides the first mass-resolved antiproton measurements above 18 GeV.

    Area of Science:

    • Cosmic-ray physics
    • Particle astrophysics

    Background:

    • Understanding cosmic-ray composition is crucial for particle astrophysics.
    • Previous measurements of the antiproton-to-proton ratio have limitations in energy range and particle identification.

    Purpose of the Study:

    • To measure the cosmic-ray antiproton-to-proton ratio from 3 to 50 GeV.
    • To achieve the first event-by-event, mass-resolved antiproton measurements above 18 GeV.

    Main Methods:

    • Utilized the NMSU-WIZARD/CAPRICE98 balloon-borne magnet spectrometer.
    • Employed a gas-RICH (Ring-Imaging Cerenkov) counter for charge-one particle identification above 5 GeV.
    • Incorporated a silicon-tungsten imaging calorimeter for precise energy and particle measurements.

    Main Results:

    Related Experiment Videos

    • Reported new cosmic-ray antiproton-to-proton ratio measurements between 3 and 50 GeV.
    • Achieved the first mass-resolved antiproton measurements on an event-by-event basis above 18 GeV.
    • The measured ratio aligns with predictions of pure secondary interstellar production.

    Conclusions:

    • The results support the theory that antiprotons are primarily produced by the interaction of cosmic rays with interstellar matter.
    • The advanced RICH detector enabled unprecedented high-energy particle identification.