CALCULATION OF INELASTIC NEUTRON SCATTERING: ZIRCONIUM-90, ZIRCONIUM-92, NIOBIUM-93, AND ALUMINUM-27

Technical Report · Tue Aug 15 00:00:00 EDT 1961

OSTI ID:4832905

Goldman, D T; Lubitz, C R

In order to produce accurate calculations of reactor criticality, neutron ages, and fast flux distributions, it is necessary to have accurate input for digital computation of the inelastic scattering of neutrons. The Hauser- Feshbach theory of compound nucleus reactions has been applied to the inelastic scattering of neutrons from Zr/sup 90/ , Zr/sup 92/ Nb/sup 93/ , and Al/sup 27/. Penetrabilities were derived from optical potentials which included spin-orbit terms, necessitating an extension of the original Hauser-Feshbach equations to the spin-dependent case. For the heavy elements, two sets of optical potentials were used, derived in different ways, but both reproducing reasonably well the elastic scattering angular distributions. One of these sets appears to be more accurate than the other in predicting the inelastic cross sections. For Al, one set of parameters was used, for which both the elastic and inelastic predictions agree very well with the experirnental data. The data presented will be incorporated, as appropriate, into multi- and few-group computer programs for reactor analysis. (auth)

• Research Organization: Knolls Atomic Power Lab., Schenectady, N.Y.
• DOE Contract Number: W-31-109-ENG-52
• NSA Number: NSA-16-001023
• OSTI ID: 4832905
• Report Number(s): KAPL-2163
• Country of Publication: United States
• Language: English

Related Subjects

ABSORPTION
ALUMINUM 27
ANGULAR DISTRIBUTION
COMPOUND NUCLEI
CRITICALITY
CROSS SECTIONS
DIGITAL SYSTEMS
DISTRIBUTION
ELEMENTS
EXCITATION
HALF-LIFE
HAUSER-FESHBACH THEORY
INTERACTIONS
NEUTRON FLUX
NIOBIUM 93
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUMERICALS
OPTICAL MODEL
ORBITS
PHYSICS
PROGRAMMING
RANDOM PHASE APPROXIMATION
REACTORS
SCATTERING
SPIN
STATISTICS
ZIRCONIUM 90
ZIRCONIUM 92