Atmospheric and astrophysical neutrinos above 1 TeV interacting in IceCube
Atmospheric and astrophysical neutrinos above 1 TeV interacting in IceCube
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DOI：
10.1103/physrevd.91.022001
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发表时间：
2015-01-05
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.;Ackermann, M.;Zoll, M.
冰立方中微子天文台的设计初衷是寻找遥远天体中产生的高能（TeV-PeV）中微子。搜索。大于或类似于100 TeV的中微子在仪器体积内相互作用，最近为这种中微子的各向同性通量提供了证据。在能量较低的情况下，冰立方从宇宙射线空气阵雨中介子的弱衰变中收集了大量中微子。在这里，我们展示了2010-2012年641天的数据中，在冰立方的仪器体积内寻找1 TeV和1 PeV之间的中微子相互作用的结果，首次将来自南方天空的中微子的能量阈值降低到10 TeV以下，远远低于之前高能分析的阈值。天体物理中微子仍然是南方天空的主要组成部分，其沉积能量为10 TeV。从这些数据中，我们得出了对漫射天体物理中微子谱的新约束，对于25 TeV < E-v < 1.4 PeV, Phi(v) = 2.06(-0.3)(+0.4) x 10(-18) (E-v = 10(5) GeV)-2.46 +/- 0.12GeV-1 cm(-2) sr(-1) s(-1)，以及大气中粲介子衰变产生的中微子通量的最强上限，是先前冰立方结果中使用的基准理论预测的1.52倍，可信度为90%。
The IceCube Neutrino Observatory was designed primarily to search for high-energy (TeV-PeV) neutLrinos produced in distant astrophysical objects. A search for. greater than or similar to 100 TeV neutrinos interacting inside the instrumented volume has recently provided evidence for an isotropic flux of such neutrinos. At lower energies, IceCube collects large numbers of neutrinos from the weak decays of mesons in cosmic-ray air showers. Here we present the results of a search for neutrino interactions inside IceCube's instrumented volume between 1 TeV and 1 PeV in 641 days of data taken from 2010-2012, lowering the energy threshold for neutrinos from the southern sky below 10 TeV for the first time, far below the threshold of the previous high-energy analysis. Astrophysical neutrinos remain the dominant component in the southern sky down to a deposited energy of 10 TeV. From these data we derive new constraints on the diffuse astrophysical neutrino spectrum, Phi(v) = 2.06(-0.3)(+0.4) x 10(-18) (E-v = 10(5) GeV)-2.46 +/- 0.12GeV-1 cm(-2) sr(-1) s(-1) for 25 TeV < E-v < 1.4 PeV, as well as the strongest upper limit yet on the flux of neutrinos from charmed-meson decay in the atmosphere, 1.52 times the benchmark theoretical prediction used in previous IceCube results at 90% confidence.