Observation of the cosmic-ray shadow of the Moon with IceCube
Observation of the cosmic-ray shadow of the Moon with IceCube
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DOI：
10.1103/physrevd.89.102004
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发表时间：
2014-05-28
影响因子：
5
通讯作者：
Zoll, M.
中科院分区：
文献类型：
--
作者：
Aartsen, M. G.;Abbasi, R.;Zoll, M.
我们报告了用冰立方探测器观察到的来自月球方向的宇宙射线的显著缺陷。对这种“月球阴影”的研究用于表征探测器的角分辨率和绝对指向能力。探测是基于探测器建成前的两个时期采集的数据：2008年4月至2009年5月，冰立方以部分配置运行，在南极冰上部署了40个探测器串；2009年5月至2010年5月，探测器以59个探测器串运行。使用两种独立的分析方法，在两种探测器配置下观测到的月球阴影具有很高的显著性（> 6 sigma）。当考虑地磁偏转效应时，观测到的阴影中心位置与预期位置相差0.2度以内。这一测量结果验证了冰立方的定向重建能力。
We report on the observation of a significant deficit of cosmic rays from the direction of the Moon with the IceCube detector. The study of this "Moon shadow" is used to characterize the angular resolution and absolute pointing capabilities of the detector. The detection is based on data taken in two periods before the completion of the detector: between April 2008 and May 2009, when IceCube operated in a partial configuration with 40 detector strings deployed in the South Pole ice, and between May 2009 and May 2010 when the detector operated with 59 strings. Using two independent analysis methods, the Moon shadow has been observed to high significance (> 6 sigma) in both detector configurations. The observed location of the shadow center is within 0.2 degrees of its expected position when geomagnetic deflection effects are taken into account. This measurement validates the directional reconstruction capabilities of IceCube.