Hydrogen scattering cross section, /sup 1/H(n,n)/sup 1/H. [Above 100 keV, review] [report]

L. Stewart
1979 unpublished
The status of the hydrogen scattering cross section is reviewed with particular emphasis on standards applications. The ENDF/B-V evaluation is described in detail and compared with experimental data. I. DESCRIPTION The hydrogen scattering cross section is the only standard which presently satisfies acceptable criteria for standards applications above 100 keV. That is, it has no structure and is known with sufficient accuracy to be used as a reference cross section. This cross section is highly
more » ... section is highly recommended for the range from a few keV to 20 MeV and, when used in conjunction with a 1/v cross section up to a few keV, the energy range for applied programs can be well covered. The total cross section is often referred to as "the standard". This is not the case, since the total cross section can only be used to check the integral of the elastic scattering angular distributions. The recoil proton is usually the detected particle. If used in a protontelescope arrangement, some kind of radiator is employed whose thinkness limits the recoil-proton range (and therefore the neutron energy to be investigated). Whenever a telescope is used, the angular distribution of the protons becomes the dominant factor in setting the accuracy to be associated with the use of this standard. This is particularly important when the observed solid angle is small.
doi:10.2172/6180108 fatcat:cqyevx7tcvbuhkgnkz7fmnkah4