Charge-dependent spectral softenings of primary cosmic-rays below the knee
DAMPE Collaboration, Francesca Alemanno, Qi An, Philipp Azzarello, Felicia-Carla-Tiziana Barbato, Paolo Bernardini, Xiao-Jun Bi, Hugo Valentin Boutin, Irene Cag… 展开作者
DAMPE Collaboration, Francesca Alemanno, Qi An, Philipp Azzarello, Felicia-Carla-Tiziana Barbato, Paolo Bernardini, Xiao-Jun Bi, Hugo Valentin Boutin, Irene Cagnoli, Ming-Sheng Cai, Elisabetta Casilli, Jin Chang, Deng-Yi Chen, Jun-Ling Chen, Zhan-Fang Chen, Zi-Xuan Chen, Paul Coppin, Ming-Yang Cui, Tian-Shu Cui, Ivan De Mitri, Francesco de Palma, Adriano Di Giovanni, Tie-Kuang Dong, Zhen-Xing Dong, Giacinto Donvito, Jing-Lai Duan, Kai-Kai Duan, Rui-Rui Fan, Yi-Zhong Fan, Fang Fang, Kun Fang, Chang-Qing Feng, Lei Feng, Sara Fogliacco, Jennifer-Maria Frieden, Piergiorgio Fusco, Min Gao, Fabio Gargano, Essna Ghose, Ke Gong, Yi-Zhong Gong, Dong-Ya Guo, Jian-Hua Guo, Shuang-Xue Han, Yi-Ming Hu, Guang-Shun Huang, Xiao-Yuan Huang, Yong-Yi Huang, Maria Ionica, Lu-Yao Jiang, Wei Jiang, Yao-Zu Jiang, Jie Kong, Andrii Kotenko, Dimitrios Kyratzis, Shi-Jun Lei, Bo Li, Manbing Li, Wei-Liang Li, Wen-Hao Li, Xiang Li, Xian-Qiang Li, Yao-Ming Liang, Cheng-Ming Liu, Hao Liu, Jie Liu, Shu-Bin Liu, Yang Liu, Francesco Loparco, Miao Ma, Peng-Xiong Ma, Tao Ma, Xiao-Yong Ma, Giovanni Marsella, Mario-Nicola Mazziotta, Dan Mo, Yu Nie, Xiao-Yang Niu, Andrea Parenti, Wen-Xi Peng, Xiao-Yan Peng, Chiara Perrina, Enzo Putti-Garcia, Rui Qiao, Jia-Ning Rao, Yi Rong, Andrea Serpolla, Ritabrata Sarkar, Pierpaolo Savina, Zhi Shangguan, Wei-Hua Shen, Zhao-Qiang Shen, Zhong-Tao Shen, Leandro Silveri, Jing-Xing Song, Hong Su, Meng Su, Hao-Ran Sun, Zhi-Yu Sun, Antonio Surdo, Xue-Jian Teng, Andrii Tykhonov, Gui-Fu Wang, Jin-Zhou Wang, Lian-Guo Wang, Shen Wang, Xiao-Lian Wang, Yan-Fang Wang, Da-Ming Wei, Jia-Ju Wei, Yi-Feng Wei, Di Wu, Jian Wu, Sha-Sha Wu, Xin Wu, Zi-Qing Xia, Zheng Xiong, En-Heng Xu, Hai-Tao Xu, Jing Xu, Zhi-Hui Xu, Zi-Zong Xu, Zun-Lei Xu, Guo-Feng Xue, Ming-Yu Yan, Hai-Bo Yang, Peng Yang, Ya-Qing Yang, Hui-Jun Yao, Yu-Hong Yu, Qiang Yuan, Chuan Yue, Jing-Jing Zang, Sheng-Xia Zhang, Wen-Zhang Zhang, Yan Zhang, Ya-Peng Zhang, Yi Zhang, Yong-Jie Zhang, Yong-Qiang Zhang, Yun-Long Zhang, Zhe Zhang, Zhi-Yong Zhang, Cong Zhao, Hong-Yun Zhao, Xun-Feng Zhao, Chang-Yi Zhou, Xun Zhu, Yan Zhu
In most particle acceleration or propagation theories, the characteristic features of the cosmic ray spectra due to acceleration limits or propagation phase changes are charge dependent. Alternatively, the interaction scenario would expect mass dependent spectral features in general. The observational verification of which relation takes effect in nature is still lack due to the difficulty of measuring the spectra of individual particles up to very high energies. Here we report direct measurements of the carbon, oxygen, and iron spectra from ~20 gigavolts to ~100 teravolts (~60 teravolts for iron) with 9 years of on-orbit data collected by the Dark Matter Particle Explorer. Distinct spectral softenings have been directly detected in these spectra for the first time. Combined with the updated proton and helium spectra, the spectral softening appears universally at a rigidity of ~15 teravolts. A nuclei mass dependent softening is rejected at a confidence level of >99.999%. Possible interpretations of these results, including a nearby cosmic ray source and other models such as the propagation effect, are discussed.
Spectral Softenings, Composition Bump, and Anisotropy Transition: A Consistent Picture of Cosmic-Ray Origin Below the Knee
Hebei Normal University（河北师范大学）；Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所）；University of Wisconsin–Madison（威斯康星大学麦迪逊分校）；TIANFU Cosmic Ray Research Center（天府宇宙线研究中心）；University of Chinese Academy of Sciences（中国科学院大学）
X-ray Binaries: a potential dominant contributor to the cosmic ray spectral knee structure
Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所）；University of Chinese Academy of Sciences（中国科学院大学）；National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；Southwest Jiaotong University（西南交通大学）；Tangshan University（唐山学院）；TIANFU Cosmic Ray Research Center（天府宇宙线研究中心）
Nonmonotonic change with energy of the mean logarithmic mass of cosmic rays in the knee region: the mechanism of formation of this feature and sources of particles
Super-knee cosmic rays from interacting supernovae
Frontier Research Institute for Interdisciplinary Sciences, Tohoku University（东北大学前沿跨学科研究院）；Astronomical Institute, Graduate School of Science, Tohoku University（东北大学理学研究科天文研究所）
The Fermi Bubble as a Source of Cosmic Rays in the Energy Range > 10E15 eV
{ \it Fermi}大面积望远镜最近发现了两个巨大的伽马射线气泡，它们延伸到银河系中心的北部和南部，直径和高度为$H\sim 10$ kpc。我们认为，银河系超大质量黑洞Sgr A $^*$的周期性恒星捕获过程，其捕获速率为$τ_{\rm cap}^{-1}\sim 3\times 10^{-5}$ yr $^{-1}$，每次捕获释放的能量为$W\sim 3\times 10^{52}$ erg，可以导致热等离子体以$u\sim 10^8$ cm s $^{-1}$的风速注入银河系晕.热等离子体的周期性注入可以产生一系列冲击。气泡中的高能质子在与这些冲击相互作用时被重新加速。我们表明，能量大于$E> 10^{15}$ eV，加速过程可以更好地描述随机二阶费米加速。我们提出，强子宇宙射线（CR）的“膝盖”内观察到的CR光谱产生的银河系超新星遗迹分布在银河系盘。这些粒子在费米泡中的再加速产生超过膝盖的CR。在气泡$D_B\sim 3\times 10^{30}$ cm $^2$ s $^{-1}$中，利用该能量范围内的平均CR扩散系数，我们可以再现超出膝关节和膝关节内的光谱的光谱指数。气泡冲击能与CR能的转换效率约为10%。这个模型提供了一个自然的解释所观察到的CR通量，光谱指数，并匹配的光谱在膝盖。
