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arXiv 0711.3022astro-ph
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用AMANDA- II寻找超高能中微子

Search for Ultra High-Energy Neutrinos with AMANDA-II

The IceCube Collaboration, M. Ackermann

摘要:

利用2000年至2002年期间记录的AMANDA-II数据,对能量超过10^5 GeV的弥散中微子进行了搜寻。在10^7 GeV以上,地球对中微子基本上是不透明的。这一事实,加上AMANDA-II探测器有限的过载(大约1.5公里),使这些超高能中微子集中在视界。这种分析的主要背景是大气中宇宙射线相互作用产生的下行高能μ子束。在数据中没有观察到统计学上显著超出预期背景的现象,并且在2 $\times$ 10^5 GeV到10^9 GeV的能量范围内,扩散全味中微子通量的上限被设定为E^{-2} $Φ$ _{90%CL} < 2.7 $\times$ 10^{-7} GeV cm^{-2} s^{-1} sr^{-1}。一些预测活动星系核中微子通量的模型在90%的置信水平被排除在外。

英文摘要:

A search for diffuse neutrinos with energies in excess of 10^5 GeV is conducted with AMANDA-II data recorded between 2000 and 2002. Above 10^7 GeV, the Earth is essentially opaque to neutrinos. This fact, combined with the limited overburden of the AMANDA-II detector (roughly 1.5 km), concentrates these ultra high-energy neutrinos at the horizon. The primary background for this analysis is bundles of downgoing, high-energy muons from the interaction of cosmic rays in the atmosphere. No statistically significant excess above the expected background is seen in the data, and an upper limit is set on the diffuse all-flavor neutrino flux of E^{-2} $Φ$_{90%CL} < 2.7 $\times$ 10^{-7} GeV cm^{-2} s^{-1} sr^{-1} valid over the energy range of 2 $\times$ 10^5 GeV to 10^9 GeV. A number of models which predict neutrino fluxes from active galactic nuclei are excluded at the 90% confidence level.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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