Study of the Cosmic Ray Composition above 0.4 EeV using the Longitudinal Profiles of Showers observed at the Pierre Auger Observatory
Study of the Cosmic Ray Composition above 0.4 EeV using the Longitudinal Profiles of Showers observed at the Pierre Auger Observatory
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发表时间：
2007-06
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通讯作者：
M. Unger;F. C. Collaboration
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作者：
M. Unger;F. C. Collaboration
皮埃尔·俄歇天文台自2004年1月以来一直在稳定地收集数据。在这里，我们提出了一个研究的宇宙射线的组成使用的事件记录在混合模式在第一年的数据采集。这些是由荧光检测器和表面检测器观察到的空气簇射，因此簇射最大值的深度Xmax可以直接测量。通过将观测到的平均Xmax与不同核的空气簇射模拟的预测进行比较，研究了不同能量范围内的宇宙线组成。随能量的变化（延伸率）用于推导主要成分变化的估计值。
The Pierre Auger Observatory has been collecting data in a stable manner since January 2004. We present here a study of the cosmic ray composition using events recorded in hybrid mode during the first years of data taking. These are air showers observed by the fluorescence detector as well as the surface detector, so the depth of shower maximum, Xmax, is measured directly. The cosmic ray composition is studied in different energy ranges by comparing the observed average Xmax with predictions from air shower simulations for different nuclei. The change of with energy (elongation rate) is used to derive estimates of the change in primary composition.