The Telescope Array (TA) collaboration has measured the energy spectrum of ultra-high energy cosmic rays (UHECRs) with primary energies above 1.6 x 10(18) eV. This measurement is based upon four years of observation by the surface detector component of TA. The spectrum shows a dip at an energy of 4.6x10(18) eV and a steepening at 5.4x10(19) eV which is consistent with the expectation from the GZK cutoff. We present the results of a technique, new to the analysis of UHECR surface detector data, that involves generating a complete simulation of UHECRs striking the TA surface detector. The procedure starts with shower simulations using the CORSIKA Monte Carlo program where we have solved the problems caused by use of the "thinning" approximation. This simulation method allows us to make an accurate calculation of the acceptance of the detector for the energies concerned.
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机译：望远镜阵列（TA）合作测量了一次能量超过1.6 x 10（18）eV的超高能宇宙射线（UHECR）的能谱。此测量基于TA的表面检测器组件的四年观察。频谱显示在4.6x10（18）eV的能量处出现下降，在5.4x10（19）eV的能量处出现陡峭，这与GZK截止的预期一致。我们介绍了一种分析UHECR表面探测器数据的新技术的结果，该技术涉及生成撞击TA表面探测器的UHECR的完整模拟。该过程从使用CORSIKA蒙特卡洛程序进行淋浴模拟开始，我们已经解决了由于使用“细化”近似而引起的问题。这种模拟方法使我们能够对检测器对相关能量的接受度进行精确计算。
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