Minimal model for extragalactic cosmic rays and neutrinos
Minimal model for extragalactic cosmic rays and neutrinos
复制标题
河外宇宙线和中微子的最小模型
DOI：
10.1103/physrevd.96.083006
复制
发表时间：
2017
影响因子：
5
通讯作者：
D. V. Semikoz
中科院分区：
文献类型：
--
作者：
M. Kachelriess;O. Kalashev;S. Ostapchenko;D. V. Semikoz
我们的目标是以统一的方式解释超高能宇宙射线（UHECR）和中微子的实验数据，使用一个单一的源类和遵守限制河外弥漫伽马射线背景。如果UHECR仅与其源周围的气体发生强子相互作用，则所产生的扩散宇宙射线（CR）通量可以与观测到的通量很好地匹配，同时提供大的中微子通量。然而，由于所需的重核比例相当大，因此由具有能量的UHECR引起的地球大气中空气簇射的最大值将过高。因此，额外的光强子相互作用的UHECR接近加速器必须存在，以修改在一个相对较窄的能量区间的CR的核组成。因此，我们包括光子和气体背景和联合收割机产生的CR光谱与逃逸模型预测的银河系CR通量的高能量部分。结果表明，在上述整个能量范围内，总CR通量、平均簇射最大深度及其宽度都能很好地描述实验数据。预测的高能中微子通量与冰立方的测量结果相匹配，而对河外弥漫伽马射线背景的贡献约为30%。
We aim to explain in a unified way the experimental data on ultrahigh-energy cosmic rays (UHECRs) and neutrinos, using a single source class and obeying limits on the extragalactic diffuse gamma-ray background. If UHECRs only interact hadronically with gas around their sources, the resulting diffuse cosmic-ray (CR) flux can be matched well to the observed one, providing at the same time large neutrino fluxes. Since the required fraction of heavy nuclei is, however, rather large, the maxima of air showers in the Earth’s atmosphere induced by UHECRs with energieswould be too high. Therefore, additional photohadronic interactions of UHECRs close to the accelerator have to be present, in order to modify the nuclear composition of CRs in a relatively narrow energy interval. We thus include both photon and gas backgrounds and combine the resulting CR spectra with the high-energy part of the Galactic CR fluxes predicted by the escape model. As result, we find a good description of experimental data on the total CR flux, the mean shower maximum depthand its widthin the whole energy range above. The predicted high-energy neutrino flux matches IceCube measurements, while the contribution to the extragalactic diffuse gamma ray background is of order 30%.