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Search for cosmic-ray antideuterons.

H Fuke1, T Maeno, K Abe

  • 1Institute of Space and Astronautical Science (ISAS/JAXA), Sagamihara, Kanagawa 229-8510, Japan. fuke@balloon.isas.jaxa.jp

Physical Review Letters
|October 4, 2005
PubMed
Summary

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This summary is machine-generated.

Researchers searched for cosmic-ray antideuterons but found none. This study establishes the first upper limit for antideuteron flux, crucial for understanding cosmic ray composition and dark matter.

Area of Science:

  • * Particle astrophysics and cosmology
  • * High-energy astrophysics
  • * Cosmic ray physics

Background:

  • * Cosmic rays are high-energy particles originating from outer space.
  • * The search for antimatter in cosmic rays, such as antideuterons, provides insights into fundamental physics and potential dark matter signals.
  • * Previous experiments have limited the sensitivity for detecting rare cosmic-ray antimatter species.

Purpose of the Study:

  • * To search for cosmic-ray antideuterons using a large dataset from multiple balloon flights.
  • * To establish an experimental upper limit on the differential flux of cosmic-ray antideuterons.
  • * To constrain theoretical models of cosmic ray propagation and particle astrophysics.

Main Methods:

  • * Analysis of data collected during four BESS (Balloon borne Experiment for Solar System studies) flights between 1997 and 2000.

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  • * Utilized a sensitive detector system to identify and count antideuteron candidates.
  • * Calculated the flux upper limit based on the absence of candidate events and detector acceptance.

    • Main Results:

    • * No cosmic-ray antideuteron candidates were detected in the analyzed dataset.
    • * An upper limit for the differential flux of cosmic-ray antideuterons was determined to be 1.9 x 10^-4 (m^2 s sr GeV/nucleon)^-1 at the 95% confidence level.
    • * This limit applies to the energy range of 0.17 to 1.15 GeV/nucleon at the top of the atmosphere.

    Conclusions:

    • * The non-detection of antideuterons provides stringent constraints on their abundance in cosmic rays.
    • * The derived flux upper limit is a significant contribution to the field, impacting models of new physics and astrophysical sources.
    • * Future experiments can build upon these results to further probe the cosmic ray composition and search for exotic particles.