Science. 2013 Nov 22;342(6161):1242856. doi: 10.1126/science.1242856.
We report on results of an all-sky search for high-energy neutrino events interacting within the IceCube neutrino detector conducted between May 2010 and May 2012. The search follows up on the previous detection of two PeV neutrino events, with improved sensitivity and extended energy coverage down to about 30 TeV. Twenty-six additional events were observed, substantially more than expected from atmospheric backgrounds. Combined, both searches reject a purely atmospheric origin for the 28 events at the 4σ level. These 28 events, which include the highest energy neutrinos ever observed, have flavors, directions, and energies inconsistent with those expected from the atmospheric muon and neutrino backgrounds. These properties are, however, consistent with generic predictions for an additional component of extraterrestrial origin.
我们报告了在 2010 年 5 月至 2012 年 5 月期间在冰立方中微子探测器内进行的高能中微子事件的全天空搜索结果。该搜索是在先前探测到两个 PeV 中微子事件的基础上进行的，灵敏度得到了提高，能量覆盖范围扩展到了约 30 TeV。观察到了另外 26 个事件，远远超过了大气背景的预期。这两个搜索结果共同在 4σ 水平上排除了 28 个事件完全来自大气的可能性。这 28 个事件包括有史以来观测到的能量最高的中微子，它们的味道、方向和能量与大气μ子和中微子背景所预期的不一致。然而，这些特性与来自外星的额外成分的一般预测是一致的。
