Cosmic-ray protons, nuclei, electrons, and antiparticles under a two-halo scenario of diffusive propagation

Abstract

We report calculations of cosmic-ray proton, nuclei, antiproton, electron and positron energy spectra within a "two-halo model" of diffusive transport. The two halos represent a simple, physically consistent generalization of the standard diffusion models, which assume a unique type of diffusion for cosmic rays in the whole Galactic halo. We believe instead that cosmic rays may experience a smaller energy dependence of diffusion when they are in proximity of the Galactic disk. Our scenario is supported by recent observations of cosmic-ray protons, nuclei, anisotropy, and gamma-rays. We predict remarkably hard antiparticle spectra at high energy. In particular, at E>10 GeV, the antiproton/proton ratio is expected to flatten, while the positron fraction is found to increase with energy. We discuss the implications for cosmic-ray physics and dark matter searches via antimatter.

5 pages, 4 figures, matches version published in PRD - Rapid Communication

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Cited by in corpus (58)

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• Spatial-Dependent Diffusion of Cosmic Rays and the Ratio of pbar/p, B/C
• Understanding the spectral hardenings and radial distribution of Galactic cosmic rays and Fermi diffuse gamma-rays with spatially-dependent propagation
• Galactic halo size in the light of recent AMS-02 data
• Evidence for a Time Lag in Solar Modulation of Galactic Cosmic Rays
• Solar and nuclear physics uncertainties in cosmic-ray propagation
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• Origin of the Proton-to-Helium Ratio Anomaly in Cosmic Rays
• Revisiting Spatial-Dependent Propagation Model with Latest Observations of Cosmic Ray Nuclei
• Numerical modeling of cosmic rays in the heliosphere: Analysis of proton data from AMS-02 and PAMELA
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• Prescriptions on antiproton cross section data for precise theoretical antiproton flux predictions
• Nearby source interpretation of differences among light and medium composition spectra in cosmic rays
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• Modelling the cosmic ray electron propagation in M 51
• Bayesian analysis of the break in DAMPE lepton spectra
• A Genetic Algorithm for Astroparticle Physics Studies
• Dark Matter Search in Space: Combined Analysis of Cosmic Ray Antiproton-to-Proton Flux Ratio and Positron Flux Measured by AMS-02
• Numerical modeling of cosmic-ray transport in the heliosphere and interpretation of the proton-to-helium ratio in Solar Cycle 24
• Limits on the Dark Matter from AMS-02 antiproton and positron fraction data
• Deciphering Residual Emissions: Time-Dependent Models for the Non-Thermal Interstellar Radiation from the Milky Way
• Pion decay model of TIBET-AS$\gamma$ PeV gamma-ray signal
• Theoretical interpretation of Pass 8 Fermi-LAT $e^{+}+e^{-}$ data
• Temporal evolution and rigidity dependence of the solar modulation lag of Galactic cosmic rays
• Geminga SNR: Possible candidate of local cosmic-ray factory
• A novel prediction for secondary positrons and electrons in the Galaxy
• Testing universality of cosmic-ray acceleration with proton/helium data from AMS and Voyager-1
• On the knee of Galactic cosmic rays in light of sub-TeV spectral hardenings
• Ultrahigh-energy diffuse gamma-ray emission from cosmic-ray interactions with medium surrounding acceleration sources
• Production and acceleration of antinuclei in supernova shockwaves
• Bayesian analysis of the hardening in AMS-02 nuclei spectra
• Electron and positron spectra in the three dimensional spatial-dependent propagation model
• Statistically study the optimal local sources for cosmic ray nuclei and electron
• The curious case of high-energy deuterons in Galactic cosmic rays
• Possible bump structure of cosmic ray electrons unveiled by AMS-02 data and its common origin along with the nuclei and positron
• Evidence of fresh cosmic ray in galactic plane based on DAMPE measurement of B/C and B/O ratios
• On the origin of the spectral features observed in the cosmic ray spectrum
• Origin of hardening in spectra of cosmic ray nuclei at a few hundred GeV using AMS-02 data
• Implications of a Possible Spectral Structure of Cosmic-ray Protons Unveiled by the DAMPE
• Some new hints on cosmic-ray propagation from AMS-02 nuclei spectra
• Probing the dark matter-electron interactions via hydrogen-atmosphere pulsating white dwarfs
• Origin of Spectral Hardening of Secondary Cosmic-Ray Nuclei
• Hybrid origins of the cosmic-ray nuclei spectral hardening at a few hundred GV
• Large-scale anisotropy of Galactic cosmic rays as a probe of local cosmic-ray propagation
• Data driven analysis of cosmic rays in the heliosphere: diffusion of cosmic protons
• Observation of a time lag in solar modulation of cosmic rays in the heliosphere
• The Local Bubble in the interstellar medium and the origin of the low energy cosmic rays
• Propagation Times and Energy Losses of Cosmic Protons and Antiprotons in Interplanetary Space
• Direct measurements of cosmic rays and their possible interpretations
• Fresh Insights on Cosmic-ray Propagation from the New AMS Data
• Temporal Correlation between Positive-Charged Cosmic Ray Flux and Solar Polar Field Variation: Insights from Delayed Modulation Analysis
• Proposition of FSR Photon Suppression Employing a Two-Positron Decay Dark Matter Model to Explain Positron Anomaly in Cosmic Rays
• Quantitative study of the hardening in the Alpha Magnetic Spectrometer nuclei spectra at a few hundred GV
• Constraining the position of the knee in the galactic cosmic ray spectrum with ultra-high-energy diffuse $\gamma$-rays
• New insights from cross-correlation studies between Solar activity and Cosmic-ray fluxes
• Data driven analysis of Galactic cosmic rays in the heliosphere: diffusion of cosmic protons and nuclei