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arXiv 0911.1889astro-ph.HEastro-ph.IM
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cosmic-ray核的高能能谱

Energy spectra of cosmic-ray nuclei at high energies

H. S. Ahn, P. Allison, M. G. Bagliesi, L. Barbier, J. J. Beatty, G. Bigongiari, T. J. Brandt, J. T. Childers, N. B. Conklin, S. Coutu, M. A. DuVernois, O. Ganel… 展开作者

H. S. Ahn, P. Allison, M. G. Bagliesi, L. Barbier, J. J. Beatty, G. Bigongiari, T. J. Brandt, J. T. Childers, N. B. Conklin, S. Coutu, M. A. DuVernois, O. Ganel, J. H. Han, J. A. Jeon, K. C. Kim, M. H. Lee, P. Maestro, A. Malinine, P. S. Marrocchesi, S. Minnick, S. I. Mognet, S. W. Nam, S. Nutter, I. H. Park, N. H. Park, E. S. Seo, R. Sina, P. Walpole, J. Wu, J. Yang, Y. S. Yoon, R. Zei, S. Y. Zinn

摘要:

我们提出了新的测量宇宙射线(CR)核的能量谱的气球载实验宇宙射线能量学和质量(CREAM)的第二次飞行。该仪器包括不同的粒子探测器,以提供冗余电荷识别和测量高达数百TeV的CR能量。所测得的C,O,Ne,Mg,Si和Fe的单个能谱高达$\sim 10^{14}$ eV。这些主要元素的光谱形状看起来几乎相同,并且它可以在能量上符合$E^{-2.66 \pm 0.04}$幂律。此外,在100-800 GeV/ $n$能量范围内对氮的绝对强度进行了新的测量,其误差比以前的观测结果小,这清楚地表明了在高能量下光谱的硬化。大气层顶部N/O的相对丰度为$0.080 \pm 0.025 $(stat.)$ \pm 0.025 $(系统)在$\sim $ 800 GeV/ $n$,在良好的协议与最近的结果从第一CREAM飞行。

英文摘要:

We present new measurements of the energy spectra of cosmic-ray (CR) nuclei from the second flight of the balloon-borne experiment Cosmic Ray Energetics And Mass (CREAM). The instrument included different particle detectors to provide redundant charge identification and measure the energy of CRs up to several hundred TeV. The measured individual energy spectra of C, O, Ne, Mg, Si, and Fe are presented up to $\sim 10^{14}$ eV. The spectral shape looks nearly the same for these primary elements and it can be fitted to an $E^{-2.66 \pm 0.04}$ power law in energy. Moreover, a new measurement of the absolute intensity of nitrogen in the 100-800 GeV/$n$ energy range with smaller errors than previous observations, clearly indicates a hardening of the spectrum at high energy. The relative abundance of N/O at the top of the atmosphere is measured to be $0.080 \pm 0.025 $(stat.)$ \pm 0.025 $(sys.) at $\sim $800 GeV/$n$, in good agreement with a recent result from the first CREAM flight.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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