对“用直接几何谱仪测量氢的高能中子散射”一文的评论。C. R A Cowley，J W Taylor，S M Bennington，Stock [ arXiv：0907.1945]
Comment on "High energy neutron scattering from hydrogen using a direct geometry spectrometer". C. Stock, R A Cowley, J W Taylor and S M Bennington [arXiv:0907.1945]
摘要：
标题[1]中的论文报告了使用ISIS的直接几何MARI谱仪在1-100 eV能量转移范围内测量氢的中子散射。Stock等人声称，他们的测量具有比ISIS的逆几何VESUVIO光谱仪更好或相当的能量分辨率。最重要的是，文献[1]中的主要结论是无效的，除非这个声明是正确的：特别是在VESUVIO上测量的异常中子截面的结论[2]是“使用间接几何谱仪的实验问题的结果”。我们在这里提出压倒性的证据表明，在参考文献[1]中测量的能量分辨率比VESUVIO粗得多。因此，Stock等人的结论是没有根据的。实际上，参考文献[1]的测量主要用于证明在eV中子能量下，直接几何斩波器谱仪的能量分辨率大大低于基于共振箔方法的逆几何谱仪。
英文摘要：
The paper in the title [1] reports measurements of neutron scattering from hydrogen in the 1-100 eV range of energy transfers, using the direct geometry MARI spectrometer at ISIS. Stock et al claim that their measurements have better or comparable energy resolution to those on the inverse geometry VESUVIO spectrometer at ISIS. Most importantly the main conclusions of ref [1] are not valid unless this claim is true: in particular the conclusion that anomalous neutron cross sections measured on VESUVIO [2] are "the result of experimental issues using indirect geometry spectrometers". We present here overwhelming evidence that the energy resolution of the measurements in ref [1] is much coarser than on VESUVIO. It follows that the conclusions of Stock et al are unfounded. In reality the measurements of reference [1] serve mainly to demonstrate that at eV neutron energies, direct geometry chopper spectrometers have greatly inferior energy resolution to inverse geometry spectrometers based on resonance foil methods.
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