Evidence for High-Energy Extraterrestrial Neutrinos at the IceCube Detector
Evidence for High-Energy Extraterrestrial Neutrinos at the IceCube Detector
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DOI：
10.1126/science.1242856
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发表时间：
2013-11-22
期刊：
影响因子：
56.9
通讯作者：
Zoll, M.
中科院分区：
文献类型：
--
作者：
Aartsen, M. G.;Abbasi, R.;Zoll, M.
我们报告了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相互作用的全天搜索结果。这次搜索是继之前探测到的两个PeV中微子事件之后，提高了灵敏度，并将能量覆盖范围扩大到约30 TeV。观测到26个额外的事件，大大超过了大气背景的预期。结合起来，两种研究都拒绝了4西格玛水平上28个事件的纯粹大气起源。这28个事件，包括迄今为止观测到的最高能量的中微子，其味道、方向和能量与大气μ子和中微子背景的预期不一致。然而，这些特性与关于地外起源的额外成分的一般预测是一致的。
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 4 sigma 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.