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|Type:||Artigo de periódico|
|Title:||On the natural energetic positron population in the Earth's inner radiation belt|
|Abstract:||Anti-particles may coexist with particles in the rarefied energetic particle and plasma environments of the magnetized planets. We consider here the possibility that a naturally generated belt of positrons may be part of the terrestrial radiation environment. It is suggested that energetic positrons of MeV energies can be produced in inelastic nuclear reactions resulting from energetic collisions between the geomagnetically confined population of relativistic protons and the residual terrestrial atmosphere and exosphere. The spatial location of the production of these positrons would thus most likely be the inner radiation zone on L-shells well below L = 2.0. In this work we present a computed positron source function, and we assess the longevity and probable ambient abundance of these positrons in the 10-100 MeV energy range around L = 1.2. The theoretical predictions are then compared with available experimental measurements of magnetospheric positrons. Copyright (C) 1996 Elsevier Science Ltd.|
|Editor:||Pergamon-elsevier Science Ltd|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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