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Antiprotons in cosmic rays and their implicationsA brief description of the experiments carried out so far to measure the energy spectrum of antiprotons is made and the reason for the excitement in this field of research is elucidated. The observed spectrum appears to be different form the other components of cosmic rays. Various physical processes by which antiprotons could be created are summarized. The equilibrium spectrum of antiprotons in the Galaxy, arising from each of these processes, is derived for different propagation models. It is shown that no single model can predict correctly the observed data over the entire energy region. However, the recent data at low energies suggest that the conventional models with large amount of matter traversal by cosmic rays, either in the source region or during propagation, can reproduce the data closely. The implications of these propagation models for other components are discussed and the need for more observations is emphasized.
Document ID
19900028403
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Stephens, S. A.
(New Mexico State University Las Cruces; Tata Institute of Fundamental Research, Bombay, India)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Publication Information
Publication: Advances in Space Research
Volume: 9
Issue: 12 1
ISSN: 0273-1177
Subject Category
Space Radiation
Accession Number
90A15458
Funding Number(s)
CONTRACT_GRANT: NAGW-110
Distribution Limits
Public
Copyright
Other

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