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Phenomenological models of Cosmic Ray transport in Galaxies | | Carmelo Evoli
; Ulyana Dupletsa
; | | Date: |
1 Sep 2023 | | Abstract: | When examining the abundance of elements in the placid interstellar medium, a
deep hollow between helium and carbon becomes apparent. Notably, the fragile
light nuclei Lithium, Beryllium, and Boron (collectively known as LiBeB) are
not formed, with the exception of Li7, during the process of Big Bang
nucleosynthesis, nor do they arise as byproducts of stellar lifecycles. In
contrast to the majority of elements, these species owe their existence to the
most energetic particles in the Universe. Cosmic rays, originating in the most
powerful Milky Way’s particle accelerators, reach the Earth after traversing
tangled and lengthy paths spanning millions of years. During their journey,
these primary particles undergo transformations through collisions with
interstellar matter. This process, known as spallation, alters their
composition and introduces secondary light elements in the cosmic-ray beam. In
light of this, the relatively large abundance of LiBeB in the cosmic radiation
provides remarkable insights into the mechanisms of particle acceleration, as
well as the micro-physics of confinement within galactic magnetic fields. These
lecture notes are intended to equip readers with basic knowledge necessary for
examining the chemical and isotopic composition, as well as the energy spectra,
of cosmic rays, finally fostering a more profound comprehension of the complex
high-energy astrophysical processes occurring within our Galaxy. | | Source: | arXiv, 2309.00298 | | Services: | Forum | Review | PDF | Favorites | |
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