A MULTIGROUP LIBRARY OF ABSORPTION CROSS SECTIONS FOR NATURAL SAMARIUM IN ZIRCONIUM HYDRIDE MODERATED REACTORS

Technical Report · Thu Mar 21 04:00:00 EST 1963

OSTI ID:4708377

Norman, R H

A multigroup library of absorption cross sections for samarium to be used with the ULCER, QUICKIE, and FAIM codes is presented. The methods of calculation discussed depend on the particular energy region under consideration. In the thermal energy range the zirconium hydride spectrum for the SNAP 2/10A core is computed with the QUlCKIE code and is used in flux-weighting cross sections based on BNL-325 data. In the epithermal and intermediate energy range, infinitely dilute resonance integrals are calculated by weighting the Breit- Wigner single-level resonance cross section with a 1/E flux spectrum. Unresolved the BNL-325 curve. It is necessary to include the 1/V contribution to sigma / sub a/ in the resonance region as a consequence of the approximation Eo approx equal E in integrating the Breit-Wigner formula. In a large part of the fast energy region, the absorption cross section as reported in BNL-325 is assumed to be zero. (auth)

• Research Organization: Atomics International. Div. of North American Aviation, Inc., Canoga Park, Calif.
• DOE Contract Number: AT(11-1)-GEN-8
• NSA Number: NSA-17-024394
• OSTI ID: 4708377
• Report Number(s): NAA-SR-Memo-8274
• Country of Publication: United States
• Language: English

Related Subjects

ABSORPTION
BREIT-WIGNER FORMULA
CROSS SECTIONS
DIAGRAMS
DISPERSION THEORY
ENERGY
ENERGY RANGE
EPITHERMAL NEUTRONS
FAST NEUTRONS
MODERATORS
NUCLEAR REACTIONS
NUMERICALS
PHYSICS
PROGRAMMING
QUANTUM MECHANICS
REACTORS
RESONANCE ESCAPE PROBABILITY
SAMARIUM
SPECTRA
ZIRCONIUM HYDRIDES