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arXiv 0801.0582astro-ph
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高能原初Cosmic-Ray核的组成

Composition of Primary Cosmic-Ray Nuclei at High Energies

M. Ave, P. J. Boyle, F. Gahbauer, C. Hoppner, J. R. Horandel, M. Ichimura, D. Muller, A. Romero-Wolf

摘要:

TRACER仪器(“宇宙高能辐射过渡辐射阵列”)是为直接测量高能较重的初级宇宙射线核而开发的。该仪器于2003年在南极洲成功地进行了长时间的气球飞行。描述了探测器系统和测量过程,讨论了数据分析的细节,并给出了元素O,Ne,Mg,Si,S,Ar,Ca和Fe(核电荷Z=8至26)的单个能谱。TRACER的大几何因子和过渡辐射探测器的使用使得有可能确定能量超过10 $^{14}$ eV/粒子的光谱。幂律拟合到每amu 20 GeV以上的单个能谱,对所有元素表现出几乎相同的谱指数($\sim$ 2.65 $\pm$ 0.05),对元素电荷Z没有明显的依赖性。

英文摘要:

The TRACER instrument (``Transition Radiation Array for Cosmic Energetic Radiation'') has been developed for direct measurements of the heavier primary cosmic-ray nuclei at high energies. The instrument had a successful long-duration balloon flight in Antarctica in 2003. The detector system and measurement process are described, details of the data analysis are discussed, and the individual energy spectra of the elements O, Ne, Mg, Si, S, Ar, Ca, and Fe (nuclear charge Z=8 to 26) are presented. The large geometric factor of TRACER and the use of a transition radiation detector make it possible to determine the spectra up to energies in excess of 10$^{14}$ eV per particle. A power-law fit to the individual energy spectra above 20 GeV per amu exhibits nearly the same spectral index ($\sim$ 2.65 $\pm$ 0.05) for all elements, without noticeable dependence on the elemental charge Z.

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