Temperature-dependent neutron scattering cross-sections for polyethylene

✍ Scribed by Roger E. Hill; C.-Y. Liu

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 256 KB
• Volume: 538
• Category: Article
• ISSN: 0168-9002
• DOI: 10.1016/j.nima.2004.08.125

✦ Synopsis

This note presents neutron scattering cross-sections for polyethylene at 296, 77 and 4 K derived from a new scattering kernel for neutron scattering off of hydrogen in polyethylene. The kernel was developed in ENDF-6 format as a set of Sða; b) tables using the LEAPR module of the NJOY94 code package. The polyethylene density of states (from 0 to sub eV) adopted to derive the new kernel is presented. We compare our calculated room temperature total scattering crosssections and double differential cross-sections at 232 meV at various angles with the available experimental data (at room temperature), and then extrapolate the calculations to lower temperatures (77 and 4 K). The new temperaturedependent scattering kernel gives a good quantitative fit to the available room temperature data and has a temperature dependence that is qualitatively consistent with thermodynamics.