Transport parameters from AMS-02 F/Si data and fluorine source abundance

Abstract

The AMS-02 collaboration recently released cosmic-ray F/Si data of unprecedented accuracy. Cosmic-ray (CR) fluorine is predominantly produced by fragmentation of heavier progenitors, while silicon is mostly accelerated at source. This ratio is thus maximally sensitive to CR propagation. We study the compatibility of the transport parameters derived from the F/Si ratio with those obtained from the lighter (Li,Be,B)/C ratios. We also inspect the CR source abundance of F, one of the few elements with a high first ionisation potential but only moderately volatile, and a potentially key element to study the acceleration mechanism of CRs. We use the 1D diffusion model implemented in the USINE code and perform ${\chi }^2$ analyses accounting for several systematic effects (energy correlations in data, nuclear cross sections and solar modulation uncertainties). We also take advantage of the EXFOR nuclear database to update the F production cross sections for its most important progenitors (identified to be 56Fe, 32S, 28Si, 27Al, 24Mg, 22Ne, and 20Ne). The transport parameters obtained from AMS-02 F/Si data are compatible with those obtained from AMS-02 (Li,Be,B)/C data. The combined fit of all these ratios leads to a chi2/dof$\approx 1.1$, with $\lesssim 10\%$ adjustments of the B and F production cross sections (the latter are based on very few nuclear data points, and would strongly benefit from new measurements). The F/Si ratio is compatible with a pure secondary origin of F, with a best-fit relative source abundance (19F/28Si)$\sim 10^{-3}$ and an upper limit of $\sim 5\times 10^{-3}$. Unfortunately, this limit is not sufficient to test global acceleration models of CR nuclei, for which values at the level of $\sim 10^{-4}$ are required. Such levels could be attained with F/Si data of a few percent accuracy at a few tens of TV, possibly within reach of the next generation of CR experiments.

18 pages, 14 figures, 4 tables (1 new): more re-organisation (for referees), but results and conclusions still unchanged (matching accepted A&A version)

References in corpus (83)

• Cosmic-ray propagation and interactions in the Galaxy
• Propagation of cosmic-ray nucleons in the Galaxy
• The Interstellar Environment of our Galaxy
• Towards a More Complete and Accurate Experimental Nuclear Reaction Data Library (EXFOR): International Collaboration Between Nuclear Reaction Data Centres (NRDC)
• Cosmic Rays below Z=30 in a diffusion model: new constraints on propagation parameters
• Constraints on cosmic-ray propagation models from a global Bayesian analysis
• Dissipation of Magnetohydrodynamic Waves on Energetic Particles: Impact on Interstellar Turbulence and Cosmic Ray Transport
• Cosmic-Ray Nuclei, Antiprotons and Gamma-rays in the Galaxy: a New Diffusion Model
• Spectral breaks as a signature of cosmic ray induced turbulence in the Galaxy
• Cosmic Ray Scattering and Streaming in Compressible Magnetohydrodynamic Turbulence
• Galactic Cosmic Rays from Supernova Remnants: II Shock Acceleration of Gas and Dust
• Galactic Cosmic Rays from Supernova Remnants (I) - a Cosmic Ray Composition controlled by Volatility and Mass-to-Charge Ratio
• The origin of Galactic cosmic rays: challenges to the standard paradigm
• Origin of the Cosmic Ray Spectral Hardening
• CRDB: a database of charged cosmic rays
• The Modified Weighted Slab Technique: Models and Results
• High-energy antiprotons from old supernova remnants
• Testing the Origin of High-Energy Cosmic Rays
• A Precision Search for WIMPs with Charged Cosmic Rays
• A Markov Chain Monte Carlo technique to sample transport and source parameters of Galactic cosmic rays: II. Results for the diffusion model combining B/C and radioactive nuclei
• Cosmic ray neon, Wolf-Rayet stars, and the superbubble origin of galactic cosmic rays
• AMS-02 beryllium data and its implication for cosmic ray transport
• Current status and desired accuracy of the isotopic production cross sections relevant to astrophysics of cosmic rays I. Li, Be, B, C, N
• Spectra of Cosmic Ray Protons and Helium Produced in Supernova Remnants
• Indications for a high-rigidity break in the cosmic-ray diffusion coefficient
• AMS-02 data confronts acceleration of cosmic ray secondaries in nearby sources
• Signatures of a two million year old supernova in the spectra of cosmic ray protons, antiprotons and positrons
• Inference of the Local Interstellar Spectra of Cosmic Ray Nuclei Z<=28 with the GalProp-HelMod Framework
• Origin of the Cosmic Ray Galactic Halo Driven by Advected Turbulence and Self-Generated Waves
• Cosmic-ray transport from AMS-02 B/C data: benchmark models and interpretation
• Systematic uncertainties on the cosmic-ray transport parameters: Is it possible to reconcile B/C data with delta = 1/3 or delta = 1/2?
• Spallation Residues in the Reaction 56Fe + p at 0.3, 0.5, 0.75, 1.0 and 1.5 A GeV
• New results on source and diffusion spectral features of Galactic cosmic rays: I- B/C ratio
• AMS-100: The Next Generation Magnetic Spectrometer in Space -- An International Science Platform for Physics and Astrophysics at Lagrange Point 2
• Nearby supernova remnants and the cosmic-ray spectral hardening at high energies
• Cosmic-ray propagation with DRAGON2: II. Nuclear interactions with the interstellar gas
• AMS-02 Antiprotons Reloaded
• High-resolution velocity measurements on fully identified light nuclides produced in 56Fe + hydrogen and 56Fe + titanium systems
• GeV-TeV cosmic-ray spectral anomaly as due to re-acceleration by weak shocks in the Galaxy
• Galactic halo size in the light of recent AMS-02 data
• Constraining Galactic cosmic-ray parameters with Z<=2 nuclei
• Combined analysis of AMS-02 (Li,Be,B)/C, N/O, 3He, and 4He data
• Theoretical uncertainties in extracting cosmic-ray diffusion parameters: the boron-to-carbon ratio
• Direct Measurement of the Cosmic-Ray Carbon and Oxygen Spectra from 10 GeV$/n$ to 2.2 TeV$/n$ with the Calorimetric Electron Telescope on the International Space Station
• Cosmic ray production in supernova remnants including reacceleration: the secondary to primary ratio
• AMS-02 antiprotons' consistency with a secondary astrophysical origin
• Dark matter or correlated errors: Systematics of the AMS-02 antiproton excess
• Constraining the origin of the rising cosmic ray positron fraction with the boron-to-carbon ratio
• USINE: semi-analytical models for Galactic cosmic-ray propagation
• Fitting B/C cosmic-ray data in the AMS-02 era: A cookbook
• The Origin of Galactic Cosmic Rays as Revealed by their Composition
• Excesses of Cosmic Ray Spectra from A Single Nearby Source
• Cosmic-ray database update: ultra-high energy, ultra-heavy, and anti-nuclei cosmic-ray data (CRDB v4.0)
• Cosmic ray signatures of a 2-3 Myr old local supernova
• Implications of Lithium to Oxygen AMS-02 spectra on our understanding of cosmic-ray diffusion
• Particle acceleration by supernova shocks and spallogenic nucleosynthesis of light elements
• p, He, and C to Fe cosmic-ray primary fluxes in diffusion models: Source and transport signatures on fluxes and ratios
• A discovery of a low-energy excess in cosmic-ray iron: an evidence of the past supernova activity in the Local Bubble
• Revisiting the hardening of the cosmic-ray energy spectrum at TeV energies
• Cosmic-Ray Hardenings in the Light of AMS-02
• The theory of cosmic-ray scattering on pre-existing MHD modes meets data
• Secondary Cosmic Ray Nuclei from Supernova Remnants and Constraints to the Propagation Parameters
• Breaks in interstellar spectra of positrons and electrons derived from time-dependent AMS data
• Cosmic ray propagation in galactic turbulence
• Propagation of H and He cosmic ray isotopes in the Galaxy: astrophysical and nuclear uncertainties
• Stable laws and cosmic ray physics
• Variance of the Galactic nuclei cosmic ray flux
• The TeV Cosmic Ray Bump: a Message from Epsilon Indi or Epsilon Eridani Star?
• Explaining cosmic ray antimatter with secondaries from old supernova remnants
• Cosmic Ray Origins in Supernova Blast Waves
• Testing the universality of cosmic-ray nuclei from protons to oxygen with AMS-02
• A simple determination of the halo size $L$ from ${}^{10}$Be/${}^9$Be data
• The Origin of Cosmic Rays: How Their Composition Defines Their Sources and Sites, and the Processes of Their Mixing, Injection and Acceleration
• Revisit cosmic ray propagation by using ${}^1$H, ${}^2$H, ${}^3$He and ${}^4$He
• DAMPE proton spectrum indicates a slow-diffusion zone in the nearby ISM
• Intermediate mass and heavy Galactic cosmic-ray nuclei: the case of new AMS-02 measurements
• A Hint of a Low-Energy Excess in Cosmic-Ray Fluorine
• The importance of Fe fragmentation for LiBeB analyses: Is a Li primary source needed to explain AMS-02 data?
• Can the Production Cross-Section Uncertainties Explain the Cosmic Fluorine Anomaly?
• TeV cosmic-ray proton and helium spectra in the myriad model II
• Non-linear acceleration at supernova remnant shocks and the hardening in the cosmic ray spectrum
• The rigidity dependence of galactic cosmic-ray fluxes and its connection with the diffusion coefficient
• Some new hints on cosmic-ray propagation from AMS-02 nuclei spectra

Cited by in corpus (1)

• Revisiting electron-capture decay for Galactic cosmic-ray data