论文标题
在国际空间站上使用量热电子望远镜观察宇宙射线质子从50 GEV到60 TEV的光谱结构的观察
Observation of Spectral Structures in the Flux of Cosmic-Ray Protons from 50 GeV to 60 TeV with the Calorimetric Electron Telescope on the International Space Station
论文作者
论文摘要
用量热的电子望远镜（磁盘）的宇宙射线质子光谱的精确测量以从50 GEV到60 TEV的能量间隔表示，并报告了10 TEV以上光谱的软化的观察。该分析基于$ \ sim $ 6.2年在国际空间站的平稳操作中收集的数据，并且相对于先前的质子通量测量，涵盖了更广泛的能量范围，可将可用统计数据提高到$ \ sim $ 2.2。在几百个GEV之上，我们证实了我们先前对具有更高意义的进行性光谱硬化（超过20个Sigma）的观察。在多TEV区域中，我们观察到第二个光谱特征，在10个TEV附近的软化，光谱指数从= 2.6始终在误差中变为-2.9，并在误差内始终如一，dampe报告的光谱形状。我们应用质子差异光谱的同时拟合，该光谱很好地再现了涉及较低能量幂律制度的光谱指数的逐渐变化，并且在较高能量下观察到的两个光谱特征。
A precise measurement of the cosmic-ray proton spectrum with the Calorimetric Electron Telescope (CALET) is presented in the energy interval from 50 GeV to 60 TeV, and the observation of a softening of the spectrum above 10 TeV is reported. The analysis is based on the data collected during $\sim$6.2 years of smooth operations aboard the International Space Station and covers a broader energy range with respect to the previous proton flux measurement by CALET, with an increase of the available statistics by a factor of $\sim$2.2. Above a few hundred GeV we confirm our previous observation of a progressive spectral hardening with a higher significance (more than 20 sigma). In the multi-TeV region we observe a second spectral feature with a softening around 10 TeV and a spectral index change from =2.6 to -2.9 consistently, within the errors, with the shape of the spectrum reported by DAMPE. We apply a simultaneous fit of the proton differential spectrum which well reproduces the gradual change of the spectral index encompassing the lower energy power-law regime and the two spectral features observed at higher energies.
