主 讲 人 ：牛家树 副教授

活动时间：11月10日14时30分

地　　点：理科群二号楼A302

讲座内容：

The mostsignificant feature in the cosmic-ray (CR) nuclei spectra is the spectralhardening at a few hundred GeV. It is important to know whether the hardening of different nuclei species is the same or not for constructing CR sources and propagation models. In this talk, I will present that the CR nuclei spectral hardening at a few hundred GeV has hybrid origins. In detail, the dominating factors of the spectral hardening for primary and secondary CR nuclei speciesare different: the former comes from the superposition of different kinds of CR sources, while the latter comes from the propagation process. Both factors influence all kinds of CR nuclei spectra, just with different weights.

主讲人介绍：

牛家树，博士，山西大学理论物理研究所副教授。现阶段主要从事宇宙线物理、暗物质物理和恒星物理方面的研究，并在以上各方向做出了一些原创性的工作。