Doorway state structure in neutron cross sections for /sup 56/Fe
Intermediate structures in the s- and d-wave elastic and inelastic neutron scattering cross sections of /sup 56/Fe are explained on the basis of a doorway state model. A particle-vibrator coupling model is used to calculate the cross sections from which resonance energies and widths of the doorway states are extracted. No adjustable parameters are used in the calculations. Doorway state resonances in both the 1/2/sup +/ elastic scattering channel and the 3/2/sup +/ elastic and inelastic scattering channels can be accounted for by a (d/sub 5/2/ direct-sum 2/sup +/) doorway state configuration in which a single quasibound d/sub 5/2/ neutron in /sup 57/Fe is coupled to the first 2/sup +/ state of the /sup 56/Fe target. The agreement obtained between the calculations and the observed intermediate structure widths as well as the summed compound nucleus fine structure widths is good. Doorway state resonances in the p-wave neutron channels which result from (d/sub 5/2/ direct-sum 3/sup -/) configurations are also calculated.
- Research Organization:
- Knolls Atomic Power Laboratory, Schenectady, New York 12301
- OSTI ID:
- 7218403
- Journal Information:
- Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 16:1; ISSN PRVCA
- Country of Publication:
- United States
- Language:
- English
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
CROSS SECTIONS
D WAVES
ELASTIC SCATTERING
ENERGY LEVELS
EVEN-EVEN NUCLEI
HADRON REACTIONS
INELASTIC SCATTERING
INTERMEDIATE MASS NUCLEI
INTERMEDIATE STRUCTURE
IRON 56
IRON 56 TARGET
IRON ISOTOPES
ISOTOPES
MATHEMATICAL MODELS
NEUTRON REACTIONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEAR STRUCTURE
NUCLEI
NUCLEON REACTIONS
P WAVES
PARITY
PARTIAL WAVES
PARTICLE PROPERTIES
S WAVES
SCATTERING
STABLE ISOTOPES
TARGETS