arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1503.07540astro-ph.HEastro-ph.IM
收藏

超高能宇宙射线组成工作组报告

Report of the Working Group on the Composition of Ultra High Energy Cosmic Rays

R. Abbasi, J. Bellido, J. Belz, V. de Souza, W. Hanlon, D. Ikeda, J. P. Lundquist, P. Sokolsky, T. Stroman, Y. Tameda, Y. Tsunesada, M. Unger, A. Yushkov

备注：
To appear in the Proceedings of the UHECR workshop, Springdale USA, 2014
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

首次对皮埃尔俄歇天文台和望远镜阵列天文台公布的平均簇射最大深度（$X_{\rm max}$）进行了比较。利用由四种主要粒子（质子、氦、氮和铁）引发的模拟事件拟合了皮埃尔俄歇天文台测量的$X_{\rm max}$分布。通过望远镜阵列（TA）中鼓（MD）荧光和表面探测器阵列模拟了最能描述俄歇数据的主要丰度。模拟事件由TA协作使用与其数据相同的程序进行分析。结果是一个模拟版本的俄歇数据，因为它将被TA观察到。该分析允许直接比较$\langle X_{\rm max} \rangle$的演变与两个数据集的能量。由TA-MD测量的$\langle X_{\rm max} \rangle$与通过TA检测器的俄歇数据的初步模拟一致，并且发现两个数据集之间的平均差为$(2.9 \pm 2.7\;(\text{stat.}) \pm 18\;(\text{syst.}))~\text{g/cm}^2$。

英文摘要：

For the first time a proper comparison of the average depth of shower maximum ($X_{\rm max}$) published by the Pierre Auger and Telescope Array Observatories is presented. The $X_{\rm max}$ distributions measured by the Pierre Auger Observatory were fit using simulated events initiated by four primaries (proton, helium, nitrogen and iron). The primary abundances which best describe the Auger data were simulated through the Telescope Array (TA) Middle Drum (MD) fluorescence and surface detector array. The simulated events were analyzed by the TA Collaboration using the same procedure as applied to their data. The result is a simulated version of the Auger data as it would be observed by TA. This analysis allows a direct comparison of the evolution of $\langle X_{\rm max} \rangle$ with energy of both data sets. The $\langle X_{\rm max} \rangle$ measured by TA-MD is consistent with a preliminary simulation of the Auger data through the TA detector and the average difference between the two data sets was found to be $(2.9 \pm 2.7\;(\text{stat.}) \pm 18\;(\text{syst.}))~\text{g/cm}^2$.

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。

↑