Original scientific paper
The influence of reacceleration on the antiproton abundance in the interstellar medium and its attenuation in the atmosphere
R. K. Saha
; Indian Association for the Cultivation of Science, Jadavpur, Calcutta 700032, India
R. Majumdar
; Indian Association for the Cultivation of Science, Jadavpur, Calcutta 700032, India
P. Pal
; Indian Association for the Cultivation of Science, Jadavpur, Calcutta 700032, India
D. P. Bhattacharyya
; Indian Association for the Cultivation of Science, Jadavpur, Calcutta 700032, India
Abstract
An estimation has been made of the influence of reaccelaration on the abundance of secondary ¯p flux in the interstellar medium, initiated by primary cosmic ray proton collisions in the confined p+He gases in the medium. The calculated ¯p spectrum and ¯p/p flux ratio have been compared with the calculated results of Simon and Heinbach and also with the experimental data of Golden et al. and Hof et al. The present derivation is based on the production of antiprotons in the atmosphere by primary protons at several small depths. The results are also presented as ratios relative to the secondary ¯p flux at depth of 1 gm/cm2 of atmosphere. Another investigation has been made of the energy spectrum of atmospheric antiprotons from primary elemental spectra obtained from the direct measurements using the active and passive detectors borne by balloons and satellites, fitted using a standard propagation diffusion equation and the Z factors from accelerator interaction cross-sections.
Keywords
secondary ¯p flux in the interstellar medium; influence of reaccelaration; production of antiprotons in the atmosphere; energy spectrum of atmospheric antiprotons
Hrčak ID:
305488
URI
Publication date:
1.12.1999.
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