标题： HiRes实验对GZK截止现象的观测 显示英文标题

标题： Observation of the GZK Cutoff by the HiRes Experiment

摘要： 高分辨率苍蝇眼（HiRes）实验观察到了GZK截止。 HiRes对宇宙射线通量的测量显示，在能量为6 x 10^{19} eV处出现急剧抑制，正好是预期的截止能量。 我们还观察到了宇宙射线谱的“脚踝”现象，出现在能量为4 x 10^{18} eV处。 我们描述了实验、数据收集、分析，并估计了系统不确定度。 结果被呈现出来，并描述了五倍标准差观测到GZK截止的计算。 显示英文摘要

摘要： The High Resolution Fly's Eye (HiRes) experiment has observed the GZK cutoff. HiRes' measurement of the flux of cosmic rays shows a sharp suppression at an energy of 6 x 10^{19} eV, exactly the expected cutoff energy. We observe the ``ankle'' of the cosmic ray spectrum as well, at an energy of 4 x 10^{18} eV. We describe the experiment, data collection, analysis, and estimate the systematic uncertainties. The results are presented and the calculation of a five standard deviation observation of the GZK cutoff is described.