Cosmic-ray antiprotons and antinuclei

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Recent progress in experimental observations and theoretical investigations of cosmic-ray antiprotons (p̄'s) have brought new light on their origin. The p̄ energy spectrum measured by the recent BESS experiment shows the characteristic peak around 2 GeV, which was expected from "secondary" p̄'s, i.e., produced in cosmic-ray interactions with the interstellar gas. The MASS and CAPRICE experiments have detected p̄'s in the higher energy range and show that the flux decreases beyond the peak. These new data are well reproduced by theoretical calculations recently developed. Further sensitive observations with still higher statistics are required to investigate the propagation and solar modulation models in detail and to search for the primary p̄ component from novel sources, e.g. evaporating black holes or annihilating neutralino dark matter. In the case of antinuclei searches, an upper limit of a level of 10-6 is obtained for the antihelium/helium ratio both from the BESS balloon flight and the AMS space mission. In the future, BESS-polar and AMS on the ISS (International Space Station) may be expected to reach upper limits of 10-7 and 10-8, respectively.

Original languageEnglish
Pages (from-to)693-703
Number of pages11
JournalAdvances in Space Research
Volume27
Issue number4
DOIs
Publication statusPublished - 2001
Externally publishedYes

Fingerprint

BESS (satellite)
Cosmic rays
accelerator mass spectrometry
antiprotons
cosmic ray
cosmic rays
Alpha Magnetic Spectrometer
Balloons
Space stations
helium
Helium
balloon flight
energy
interstellar gas
experiment
Experiments
flight
Modulation
Statistics
International Space Station

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Cosmic-ray antiprotons and antinuclei. / Yoshimura, Koji.

In: Advances in Space Research, Vol. 27, No. 4, 2001, p. 693-703.

Research output: Contribution to journalArticle

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