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Chemical Enhancements in Shock-accelerated Particles: Ab-initio Simulations

Author(s): Caprioli, Damiano; Yi, Dennis T; Spitkovsky, Anatoly

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Abstract: We study the thermalization, injection, and acceleration of ions with different mass/charge ratios, $A/Z$, in non-relativistic collisionless shocks via hybrid (kinetic ions-fluid electrons) simulations. In general, ions thermalize to a post-shock temperature proportional to $A$. When diffusive shock acceleration is efficient, ions develop a non-thermal tail whose extent scales with $Z$ and whose normalization is enhanced as $(A/Z)^2$, so that incompletely-ionized heavy ions are preferentially accelerated. We discuss how these findings can explain observed heavy-ion enhancements in Galactic cosmic rays.
Publication Date: 27-Oct-2017
Electronic Publication Date: 27-Oct-2017
Citation: Caprioli, Damiano, Yi, Dennis T, Spitkovsky, Anatoly. (Chemical Enhancements in Shock-accelerated Particles: Ab-initio Simulations. Phys. Rev. Lett., 119 (171101 - ?. doi:10.1103/PhysRevLett.119.171101
DOI: doi:10.1103/PhysRevLett.119.171101
Type of Material: Journal Article
Journal/Proceeding Title: Phys. Rev. Lett.
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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