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|Type:||Artigo de periódico|
|Title:||Antiparticles And Light Element Isotope Ions In The Earth's Magnetosphere|
|Abstract:||The ratio of positron/electron fluxes originating in nuclear reactions in the Earth's Magnetosphere is considered. It is supposed that positrons as well as electrons are mainly produced in the decay of charged pions π± → μ± → e± born in nuclear collisions of trapped relativistic inner zone protons and of cosmic rays with the residual atmosphere. These positrons and electrons are captured in the magnetosphere and create a positron and electron radiation belt of nuclear origin. The positron/electron trapped magnetospheric fluxes formed with this mechanism from radiation belt proton source are simulated and the resulting computed e+/e- flux ratio ≈ 4 appears to be in agreement with the recent observations made by the Alpha Magnetic Spectrometer (AMS) (The AMS collaboration, 1999). A > 200 MeV positron flux with an intensity about 4 times higher than the electron flux of the same energy was registered in the equatorial region at the altitude of ≈ 400 km. This ratio is significantly different from the computed ratio ≈ 1 obtained from the primary cosmic ray source through the same mechanism. As our modeling of nuclear spallation reaction shows, in the same reaction nuclei of isotopes of hydrogen and helium are also produced, which are the source of light element isotope radiation belts of D, T, 3He and 4He with a significant excess of 3He over 4He fluxes. The AMS instrument, as we have known, also looked at the distribution of helium nuclei and only 3He was observed, which is one more evidence in favor of the above hypothesis. © 2002 Elsevier Science Ltd. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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