Possible evidence for the stochastic acceleration of secondary antiprotons by supernova remnants

Cholis, Ilias; Hooper, Dan; Linden, Tim

doi:10.1103/PhysRevD.95.123007

Title: Possible evidence for the stochastic acceleration of secondary antiprotons by supernova remnants

Journal Article · Wed Jun 14 00:00:00 EDT 2017 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.95.123007· OSTI ID:1345609

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The Johns Hopkins Univ., Baltimore, MD (United States)
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, Chicago, IL (United States)
The Ohio State Univ., Columbus, OH (United States)

In this paper, the antiproton-to-proton ratio in the cosmic-ray spectrum is a sensitive probe of new physics. Using recent measurements of the cosmic-ray antiproton and proton fluxes in the energy range of 1–1000 GeV, we study the contribution to the $$\bar{p}$$/p ratio from secondary antiprotons that are produced and subsequently accelerated within individual supernova remnants. We consider several well-motivated models for cosmic-ray propagation in the interstellar medium and marginalize our results over the uncertainties related to the antiproton production cross section and the time-, charge-, and energy-dependent effects of solar modulation. We find that the increase in the $$\bar{p}$$/p ratio observed at rigidities above ~100 GV cannot be accounted for within the context of conventional cosmic-ray propagation models, but is consistent with scenarios in which cosmic-ray antiprotons are produced and subsequently accelerated by shocks within a given supernova remnant. In light of this, the acceleration of secondary cosmic rays in supernova remnants is predicted to substantially contribute to the cosmic-ray positron spectrum, accounting for a significant fraction of the observed positron excess.

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Research Organization:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359; FG02-13ER41958; SC0009924

OSTI ID:: 1345609

Alternate ID(s):: OSTI ID: 1363982

Report Number(s):: FERMILAB-PUB-17-010-A; arXiv:1701.04406; PRVDAQ; 1509337

Journal Information:: Physical Review D, Vol. 95, Issue 12; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 27 works

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A Robust Excess in the Cosmic-Ray Antiproton Spectrum: Implications for Annihilating Dark Matter Cholis, Ilias; Linden, Tim; Hooper, Dan arXiv https://doi.org/10.48550/arxiv.1903.02549	text	January 2019

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