3 years ago

Indications for a high-rigidity break in the cosmic-ray diffusion coefficient.

David Maurin, Yoann Genolini, Vincent Poireau, Laurent Derome, Vivian Poulin, Sylvie Rosier, Mathieu Boudaud, Pierre Salati, Pasquale D. Serpico, Manuela Vecchi, Julien Lavalle, Sami Caroff

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.

Publisher URL: http://arxiv.org/abs/1706.09812

DOI: arXiv:1706.09812v2

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