论文标题
使用ICEtop从250 TEV到10 PEV的宇宙射线频谱
Cosmic Ray Spectrum from 250 TeV to 10 PeV using IceTop
论文作者
论文摘要
我们在这里报告了用ICETOP对全粒子宇宙射线谱进行测量的扩展，以降低能量。新的测量值对光谱的膝盖区域进行了全面覆盖，并减少了先前的ICETOP和直接测量之间的能量差距。借助一个新的扳机，该触发器在阵列中心的紧密间隔检测器中选择事件，ICETOP能量阈值几乎低于其先前的2 PEV阈值的数量级。在本文中，我们解释了如何实施新的触发器，并描述了开发的新机器学习方法，以处理很少的探测器。我们将结果与ICETOP和其他在较高能量以及HAWC和西藏在100 TEV范围内重叠的结果进行了比较。
We report here an extension of the measurement of the all-particle cosmic-ray spectrum with IceTop to lower energy. The new measurement gives full coverage of the knee region of the spectrum and reduces the gap in energy between previous IceTop and direct measurements. With a new trigger that selects events in closely spaced detectors in the center of the array, the IceTop energy threshold is lowered by almost an order of magnitude below its previous threshold of 2 PeV. In this paper, we explain how the new trigger is implemented, and we describe the new machine-learning method developed to deal with events with very few detectors hit. We compare the results with previous measurements by IceTop and others that overlap at higher energy and with HAWC and Tibet in the 100 TeV range.
