Cowsik, Ramanath ; Huth, Dawson (2022) A minimal model for understanding secondary cosmic rays Advances in Space Research, 70 (9). pp. 2714-2726. ISSN 02731177
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Official URL: http://doi.org/10.1016/j.asr.2022.03.010
Related URL: http://dx.doi.org/10.1016/j.asr.2022.03.010
Abstract
We take a phenomenological approach in a minimal model to understand the spectral intensity of secondary cosmic-ray particles like positrons, antiprotons, Lithium, Beryllium and Boron. Our analysis shows that cosmic rays at GeV energies pass through a significant amount of matter in regions surrounding the sources. This grammage decreases with increasing cosmic-ray energy and becomes negligible beyond GeV. During the subsequent propagation in the interstellar medium cosmic rays of all energies up to GeV/n pass through about 1–2 g cm−2 of matter before leaking into the intergalactic medium. It is in the interstellar medium that the bulk of the positrons and antiprotons are generated. Also cosmic-ray nuclei like C, N, and O at all energies generate additional amounts of Li, Be and B nuclei with a spectrum similar to those of C, O etc. The implications of these findings of the minimal model to the observations of gamma rays and also the importance of spatial and temporal discreteness of cosmic-ray sources for modeling cosmic-ray propagation are briefly pointed out.
Item Type: | Article |
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Source: | Copyright of this article belongs to Elsevier B.V |
Keywords: | Astrophysics;Cosmic rays;Cosmic ray theory |
ID Code: | 132675 |
Deposited On: | 21 Dec 2022 05:01 |
Last Modified: | 21 Dec 2022 05:01 |
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