Measurement of energy spectrum of ultra-high energy cosmic rays
Measurement of energy spectrum of ultra-high energy cosmic rays
复制标题
超高能宇宙线能谱测量
DOI：
10.1093/ptep/ptx082
复制
发表时间：
2017
影响因子：
3.5
通讯作者：
Tsunesada, Yoshiki
中科院分区：
文献类型：
--
作者：
Verzi, Valerio;Ivanov, Dmitri;Tsunesada, Yoshiki
超高能宇宙射线（uhecr）是一种能量高于e的带电粒子，起源于银河系之外。由于uhecr在地球上的通量非常小，观测uhecr的唯一实际方法是测量大气中由uhecr产生的广泛的空气雨。这是通过使用空气荧光探测器和地面上巨大的粒子探测器阵列来完成的。皮埃尔·奥格天文台（Auger）和望远镜阵列（TA）是两个使用这种技术的大型宇宙射线实验，分别覆盖3000公里和700公里的地面区域。在本文中，我们介绍了由TA报告的UHECR频谱，使用了7年积累的6300 kmsr年的数据，以及使用了10年的总暴露超过50000 kmsr年的数据，我们回顾了这两个测量的天体物理解释，并讨论了它们的系统不确定性。
Ultra-high energy cosmic rays (UHECRs) are charged particles of energies aboveeV that originate outside the Galaxy. Because the flux of the UHECRs at Earth is very small, the only practical way of observing UHECRs is by measuring theextensive air showersproduced by UHECRs in the atmosphere. This is done by using air fluorescence detectors and giant arrays of particle detectors on the ground. The Pierre Auger Observatory (Auger) and Telescope Array (TA) are two large cosmic ray experiments that use such techniques and cover 3000 and 700 kmareas on the ground, respectively. In this paper, we present the UHECR spectrum reported by TA, using an exposure of 6300 kmsr yr accumulated over 7 years of data taking, and the corresponding result of Auger, using 10 years of data with a total exposure exceeding 50 000 kmsr yr. We review the astrophysical interpretation of the two measurements, and discuss their systematic uncertainties.