Indications for a high-rigidity break in the cosmic-ray diffusion coefficient
Using cosmic-ray boron to carbon ratio (B/C) data recently released by the AMS-02 experiment, we find tantalizing indications ({\it decisive evidence}, in Bayesian terms) in favor of a diffusive origin for the broken power-law spectra found in protons (\(p\)) and helium nuclei (He). The result is ro...
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| creator | Genolini, Yoann Serpico, Pasquale D Boudaud, Mathieu Caroff, Sami Poulin, Vivian Derome, Laurent Lavalle, Julien Maurin, David Poireau, Vincent Rosier, Sylvie Salati, Pierre Vecchi, Manuela |
| description | Using cosmic-ray boron to carbon ratio (B/C) data recently released by the AMS-02 experiment, we find tantalizing indications ({\it decisive evidence}, in Bayesian terms) in favor of a diffusive origin for the broken power-law spectra found in protons (\(p\)) and helium nuclei (He). The result is robust with respect to currently estimated uncertainties in the cross sections, and in the presence of a small component of primary boron, expected because of spallation at the acceleration site. Reduced errors at high energy as well as further cosmic ray nuclei data (as absolute spectra of C, N, O, Li, Be) may definitively confirm this scenario. |
| doi_str_mv | 10.48550/arxiv.1706.09812 |
| format | Article |
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| subjects | Acceleration Bayesian analysis Boron Cosmic rays Diffusion coefficient Helium Nuclei (nuclear physics) Physics - High Energy Astrophysical Phenomena Spallation |
| title | Indications for a high-rigidity break in the cosmic-ray diffusion coefficient |
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