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

作者：N. Weinrich, Y. Génolini, M. Boudaud, L. Derome, D. Maurin · 发表于：Astronomy and Astrophysics · 年份：2020 · DOI：10.1051/0004-6361/202037875 · 被引用次数：68 · 研究领域：Solar and Space Plasma Dynamics、Astrophysics and Cosmic Phenomena、Dark Matter and Cosmic Phenomena

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 χ2 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 δ = 0.50 ± 0.03 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 3He/4He), 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 ∼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 a...