Scattering of fast neutrons by 238U

EVALUATION OF $sup 238$U NEUTRON CROSS SECTIONS FOR THE ENDF/B VERSION II FILE.

“…Recent measurements for this level by Smith [74] and Barnard [75] are notably discrepant from earlier results of Cranberg [76] and Glazkov [77]. The results of Smith indicate a much smaller cross section than Glazkov and form the basis for the present evaluation as shown in Figure 3. …”

“…Recent measurements of the '^^"U inelastic scattering cross section by Smith [74] provide a check against the extensive measurements of Barnard [75] and Smith [73] as well as the measurements by Cranberg [76] and (61) Barnard's data and the level correspondence between the two measurements is not uniquely defined. The level structure adopted for this evaluation above the 1.12 MeV level represents a compromise level structure for which the cross sections can be reliably defined from the combined data of Smith [74] and Barnard [75].…”

“…The level structure adopted for this evaluation above the 1.12 MeV level represents a compromise level structure for which the cross sections can be reliably defined from the combined data of Smith [74] and Barnard [75]. No attempt has been made to assess the validity of the more detailed level structure indicated by Barnard The data by Smith [73,74] a number of angles.…”

“…No attempt has been made to assess the validity of the more detailed level structure indicated by Barnard The data by Smith [73,74] a number of angles. Barnard [75] reports values measured at an angle of 90° and were multiplied by 0.95 x 4TT to obtain total inelastic cross sections. The factor of 0.95 is an estimated correction for angular asymmetry based on angular distributions reported by Smith [73].…”

“…Above 1.15 MeV, the cross section has not been measured and extrapolation of the cross section is somewhat arbitrary. Calculations by Dunford [78] and Prince [79] For this level as well as all higher energy levels, the measurements of Barnard [75] have been multiplied by 47T (assumed to be isotropic) to obtain the total inelastic cross section for each level.…”