American Nuclear Society
Home

Home / Store / Journals / Electronic Articles / Fusion Science and Technology / Volume 9 / Number 2 / Pages 345-361

Transmission of Fast Neutrons Through an Iron Sphere

Nolan E. Hertel, R. H. Johnsons, Bernard W. Wehring, John J. Dorning

Fusion Science and Technology / Volume 9 / Number 2 / Pages 345-361

March 1986

Format:

Price:$30.00
Member Price:$27.00
Member Savings:$3.00

Integral experiments have been performed using a homogeneous iron spherical shell to test neutron cross-section data. Neutron leakage spectra from the shell were measured using 252Cf-fission and (deuterium-tritium) D-T-fusion neutron sources and an NE-213 spectrometry system. An associated particle detector was used to monitor the absolute D-T neutron source strength as well as any accompanying deuterium-deuterium neutron contamination. The leakage spectra were calculated using the continuous-energy Monte Carlo code VIM and the discrete ordinates Sn code ANISN employing ENDF/B-IV. For neutron energies between 1 and 5 MeV, the calculations underpredicted the leakage spectrum by factors of 1.4 to 2 for the californium neutron source and of 2 to 3 for the D-T neutron source. The large discrepancies are attributed to inadequate representation of cross-section resonance structure (namely, minima); inadequate representation of the angular and secondary energy distributions for continuum inelastic scattering and (n,2n) reactions also contribute to these discrepancies.

 
 
 
Questions or comments about the site? Contact the ANS Webmaster.
advertisement