Combined analysis of AMS-02 (Li,Be,B)/C, N/O, 3He, and 4He data

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Context. The Alpha Magnetic Spectrometer (AMS-02) measured several secondary-to-primary ratios enabling a detailed study of Galactic cosmic-ray transport.

Aims. We constrain previously derived benchmark scenarios (based on AMS-02 B/C data only) using other secondary-to-primary ratios to test the universality of transport and the presence of a low-rigidity diffusion break.

Methods. We use the 1D thin disc/thick halo propagation model of USINE V3.5 and a chi(2) minimisation accounting for a covariance matrix of errors (AMS-02 systematics) and nuisance parameters (cross-sections and solar modulation uncertainties).

Results. The combined analysis of AMS-02 Li/C, Be/C, and B/C strengthens the case for a diffusion slope of delta = 0.500.03 with a low-rigidity break or upturn of the diffusion coefficient at GV rigidities. Our simple model can successfully reproduce all considered data (Li/C, Be/C, B/C, N/O, and He-3/He-4), although several issues remain: (i) the quantitative agreement depends on the assumptions made on the poorly constrained correlation lengths of AMS-02 data systematics; (ii) combined analyses are very sensitive to production cross-sections, and we find post-fit values differing by similar to 5-15% from their most likely values (roughly within currently estimated nuclear uncertainties); (iii) two very distinct regions of the parameter space remain viable, either with reacceleration and convection, or with purely diffusive transport.

Conclusions. To take full benefit of combined analyses of AMS-02 data, better nuclear data and a better handle on energy correlations in the data systematic are required. AMS-02 data on heavier species are eagerly awaited to explore cosmic-ray propagation scenarios further.

Original languageEnglish
Article numberA131
JournalAstronomy & Astrophysics
Volume639
Number of pages20
ISSN0004-6361
DOIs
Publication statusPublished - 21 Jul 2020

    Research areas

  • astroparticle physics, cosmic rays, COSMIC-RAY PROPAGATION, ACCURATE UNIVERSAL PARAMETERIZATION, PRODUCTION CROSS-SECTIONS, LIQUID-HYDROGEN TARGET, SOLAR MODULATION, SUPERNOVA-REMNANTS, NEUTRON MONITORS, MUON DETECTORS, NUCLEON BE-9, REACCELERATION

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