Average Silicon Neutron Displacement Kerma Factor at 1 MeV

The average neutron displacement kerma factor in the vicinity of 1 MeV is difficult to derive for silicon because of sharp neutron cross section resonances in that region. To avoid these difficulties, the function AE(1-e-B/E) was fitted to tabulations of D(E) vs. E, where E is energy and D(E) is the neutron displacement kerma factor for silicon at 1 MeV. The values of A and B obtained from a least squares fit yielded an average value at 1 MeV of D-(1 MeV)=95±4 MeV-mb.