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首页> 外文会议>Proceedings of the 32nd International Cosmic Ray Conference >Search for astrophysical neutrino-induced cascades using IceCube-40
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Search for astrophysical neutrino-induced cascades using IceCube-40

机译：使用IceCube-40搜索天体中微子诱发的级联

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IceCube is the first cubic-kilometre scale neutrino observatory dedicated to detecting astrophysical neutrinos.A large contribution to the expected neutrino signal is from electromagnetic and hadronic showers (cascades) initiatedby charged current u0017e interactions, and neutral current u0017e, u0017 and u0017 interactions. Cascade energy is reconstructed withbetter resolution than muons, and the atmospheric background is lower. The energy spectrum of astrophysical neutrinosis expected to be harder than that of atmospheric neutrinos, so an astrophysical neutrino signal could be observable as abreak in the cascade energy spectrum.Cascades are difficult to detect due to a large background coming from atmospheric muons and muon bundles, manyorders of magnitude larger than the cascade signal. Large statistics, advanced reconstruction methods and machinelearning techniques are required to isolate cascade events within the data. There is growing evidence for neutrino-inducedcascade events in IceCube in several analyses that were carried out using data from April 2008 to May 2009, when 40IceCube strings were operational. This is the largest instrumented volume, and yields the most sensitive search for adiffuse flux of astrophysical neutrinos using cascades to date.Two of the IceCube-40 analyses are described in these proceedings. The high energy analysis measures four backgroundevents, and sets a 90% confidence level limit for all flavour astrophysical neutrino flux of 9.5 × 108GeVsr1s1cm2over the energy range 89 TeV to 21 PeV. The mid energy analysis observes 14 cascade candidate events. The backgroundto these events is under investigation. Three of the observed events have reconstructed energies above 100 TeV.
机译：IceCube是首个立方公里规模的中微子观测站，专门用于探测天体中微子。对中微子预期信号的很大贡献来自于带电电流u0017e相互作用，中性电流u0017e，u0017和u0017相互作用引发的电磁和强子阵雨（级联）。级联能量的重建分辨率高于μ子，并且大气背景更低。天体神经病的能谱比大气中微子的能谱要难，因此在级联能谱中，天体中微子的信号可以观察到破裂。由于大气μ子和μ子束的大背景，很难检测到级联，比级联信号大许多数量级需要大量的统计数据，先进的重建方法和机器学习技术来隔离数据中的级联事件。在使用2008年4月至2009年5月（使用40IceCube弦管）的数据进行的数次分析中，越来越多的证据表明IceCube中的中微子引起的级联事件。这是仪器化的最大体积，并且迄今为止使用级联法对天体中微子的不同通量进行最敏感的搜索。在这些程序中描述了两个IceCube-40分析。高能分析测量了四个背景事件，并为能量范围为89 TeV到21 PeV的9.5×108GeVsr1s1cm2的所有风味天体中微子通量设置了90％的置信水平极限。中能量分析观察到14个级联候选事件。这些事件的背景正在调查中。观察到的事件中有三个已经重构了100 TeV以上的能量。

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