Génolini Yoann, Serpico Pasquale D, Boudaud Mathieu, Caroff Sami, Poulin Vivian, Derome Laurent, Lavalle Julien, Maurin David, Poireau Vincent, Rosier Sylvie, Salati Pierre, Vecchi Manuela
Laboratoire d'Annecy-Le-Vieux de Physique Théorique (LAPTh), Université Savoie Mont Blanc & CNRS, 74941 Annecy Cedex, France.
Laboratoire de Physique Théorique et Hautes Énergies (LPTHE), UMR 7589 CNRS & UPMC, 4 Place Jussieu, F-75252 Paris, France.
Phys Rev Lett. 2017 Dec 15;119(24):241101. doi: 10.1103/PhysRevLett.119.241101.
Using cosmic-ray boron to carbon ratio (B/C) data recently released by the Ams-02 experiment, we find indications (decisive evidence, in Bayesian terms) in favor of a diffusive propagation 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.
利用阿尔法磁谱仪（AMS-02）实验最近公布的宇宙射线硼碳比（B/C）数据，我们发现了支持质子（p）和氦核（He）中发现的破幂律谱起源于扩散传播的迹象（用贝叶斯术语来说就是决定性证据）。该结果对于目前估计的截面不确定性以及由于加速位点的散裂而预期存在的少量初级硼成分具有稳健性。高能下误差的减小以及更多宇宙射线核数据（如碳、氮、氧、锂、铍的绝对谱）可能会明确证实这一情况。
