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arXiv 0705.1315astro-ph
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用AMANDA- II对μ介子中微子扩散通量的多年搜索

Multi-year search for a diffuse flux of muon neutrinos with AMANDA-II

IceCube Collaboration, A. Achterberg

摘要:

利用2000年至2003年收集的AMANDA-II数据,对来自未解源的TeV-PeV μ子中微子进行了搜索,等效寿命为807天。这种扩散分析试图找到一个来自非热成分来源的地外中微子通量。该信号预计将具有比大气μ子和中微子背景更硬的光谱。由于在数据中没有观察到超过预期背景的过量事件,因此,E^{2}Φ_{90% C. L.} < 7.4 x 10^{-8} GeV cm^{-2} s^{-1} sr^{-1}被放置在具有Φ \propto E^{-2}谱的μ子中微子的扩散通量上,其能量范围为16 TeV至2.5 PeV。这是目前最敏感的Φ \propto E^{-2}扩散天体物理中微子极限。我们还为天体物理学和瞬发中微子模型设定了上限,所有这些模型的光谱都不同于Φ \propto E^{-2}。

英文摘要:

A search for TeV - PeV muon neutrinos from unresolved sources was performed on AMANDA-II data collected between 2000 and 2003 with an equivalent livetime of 807 days. This diffuse analysis sought to find an extraterrestrial neutrino flux from sources with non-thermal components. The signal is expected to have a harder spectrum than the atmospheric muon and neutrino backgrounds. Since no excess of events was seen in the data over the expected background, an upper limit of E^{2}Φ_{90% C.L.} < 7.4 x 10^{-8} GeV cm^{-2} s^{-1} sr^{-1} is placed on the diffuse flux of muon neutrinos with a Φ\propto E^{-2} spectrum in the energy range 16 TeV to 2.5 PeV. This is currently the most sensitive Φ\propto E^{-2} diffuse astrophysical neutrino limit. We also set upper limits for astrophysical and prompt neutrino models, all of which have spectra different than Φ\propto E^{-2}.

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