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The paper in the title [1] reports measurements of neutron scattering fromhydrogen in the 1-100 eV range of energy transfers, using the direct geometryMARI spectrometer at ISIS. Stock et al claim that their measurements havebetter or comparable energy resolution to those on the inverse geometry VESUVIOspectrometer at ISIS. Most importantly the main conclusions of ref [1] are notvalid unless this claim is true: in particular the conclusion that anomalousneutron cross sections measured on VESUVIO [2] are "the result of experimentalissues using indirect geometry spectrometers". We present here overwhelmingevidence that the energy resolution of the measurements in ref [1] is muchcoarser than on VESUVIO. It follows that the conclusions of Stock et al areunfounded. In reality the measurements of reference [1] serve mainly todemonstrate that at eV neutron energies, direct geometry chopper spectrometershave greatly inferior energy resolution to inverse geometry spectrometers basedon resonance foil methods.

physical review. b, condensed matter and materials physics

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]