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Well I used the energy ranges 0.2 millivolt, 2 millivolt, 5 millivolt and 10 millivolt. That is what I meant by meV, I should have specifed that the first time, my mistake. So I am not doing any calculations of neutron elastic scattering in the range of MeV, of Megavolts. I looked to use the mean free path legnth model to determine the rate of elastic scattering for neutrons in Aluminium in the range of .2 to 10 meV, millivolts, where the resonances of the cross section arent an issue like they are from 30 keV to 10 MeV.
And I also find it interesting that your data agrees as well as it does with the ENDF/B-VII data. According to this link :
dated May 17 of 2011, Geant4 has not yet migrated to ENDF/B-VII data yet. Maybe it was still desinged to agree with ENDF/B-VI but still agrees with ENDF/B-VII reasonably well because the data from version VI to VII hasnt changed dramatically, just different results from doing the calculations and maybe different levels of accuracy, though the results for neutron elastic scattering in Aluminium in ENDF/B-VI are mostly within standard experimental error of the ENDF/B-VII results.
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