Approximation of precompound effects in Hauser-Feshbach codes for calculating double differential (n, xn) cross sections
A simplified method for approximating precompound nuclear reaction effects in Hauser-Feshbach codes for the calculation of double differential (n,xn) cross sections is presented. The method is developed from an existing quantum mechanical formula of unified compound and precompound reaction theories. The compound part of the unified formula is made identical to that of Hauser and Feshbach by applying the unified level-density formulas derived previously for the two theories. The precompound part, much more complicated than the compound part, is simplified and globally parameterized for practical purposes. Calculated double differential (n,xn) cross sections at 14 and 26 MeV for iron, niobium, and bismuth are shown to be in good agreement with the available experimental data.
- Research Organization:
- Oak Ridge National Lab., Oak Ridge, TN (US)
- OSTI ID:
- 6062250
- Journal Information:
- Nucl. Sci. Eng.; (United States), Journal Name: Nucl. Sci. Eng.; (United States) Vol. 100:1; ISSN NSENA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
653003* -- Nuclear Theory-- Nuclear Reactions & Scattering
657002 -- Theoretical & Mathematical Physics-- Classical & Quantum Mechanics
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BISMUTH
CALCULATION METHODS
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
ELEMENTS
ENERGY RANGE
EXPERIMENTAL DATA
FIELD THEORIES
HADRON REACTIONS
HAUSER-FESHBACH THEORY
INFORMATION
IRON
MECHANICS
METALS
MEV RANGE
MEV RANGE 01-10
MEV RANGE 10-100
NEUTRON REACTIONS
NIOBIUM
NUCLEAR REACTIONS
NUCLEAR THEORY
NUCLEON REACTIONS
NUMERICAL DATA
QUANTUM MECHANICS
TRANSITION ELEMENTS
UNIFIED-FIELD THEORIES