Scattering of 64 eV to 3 keV neutrons from polyethylene and graphite and the coherence length problem

We measured the neutron scattering intensity ratios from polyethylene (CH2) relative to graphite (C) at several discrete final energies, of narrow widths (3eV) between 64 eV and 3 keV. The final energies were selected using a U238 filter. This experiment was carried out to search for any anomaly in the n-p scattered intensities from CH2 caused by the neutron coherence length. The scattered intensity ratios were found to conform to conventional expectations and no anomaly was observed.