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2Department of Physics, University of Adelaide, Adelaide, 5005 Australia.
52DESY, 15735 Zeuthen, Germany.
Eur Phys J C Part Fields. 2017;77(10):692. doi: 10.1140/epjc/s10052-017-5261-3. Epub 2017 Oct 20.
IceCube is a neutrino observatory deployed in the glacial ice at the geographic South Pole. The energy unfolding described in this paper is based on data taken with IceCube in its 79-string configuration. A sample of muon neutrino charged-current interactions with a purity of 99.5% was selected by means of a multivariate classification process based on machine learning. The subsequent unfolding was performed using the software Truee. The resulting spectrum covers an E -range of more than four orders of magnitude from 125 GeV to 3.2 PeV. Compared to the Honda atmospheric neutrino flux model, the energy spectrum shows an excess of more than in four adjacent bins for neutrino energies . The obtained spectrum is fully compatible with previous measurements of the atmospheric neutrino flux and recent IceCube measurements of a flux of high-energy astrophysical neutrinos.
冰立方中微子天文台部署在南极的冰川冰中。本文所述的能量展开是基于冰立方79线配置所采集的数据。通过基于机器学习的多变量分类过程，选取了纯度为99.5%的μ子中微子带电流相互作用样本。随后使用Truee软件进行展开。所得能谱覆盖了从125 GeV到3.2 PeV超过四个数量级的能量范围。与本田大气中微子通量模型相比，对于中微子能量 ，能谱在四个相邻区间显示出超过 的过剩。所得能谱与先前大气中微子通量的测量结果以及近期冰立方对高能天体物理中微子通量的测量结果完全兼容。
