Intermediate structure in unresolved resonances of fissile and fertile nuclides
Evidence for the existence of intermediate structure in the unresolved resonance fission and capture cross sections of /sup 235/U and in the capture cross section of /sup 238/U is reviewed. Certain of the statistical tests that have been used are known to be compromised by finite resolution when applied to unresolved resonance data, but it is concluded that over most of the energy range the test results are valid. Parity assignments for the structure in /sup 238/U(n, ..gamma..) suggest that s-wave neutron absorption is responsible for much of the structure. If this is the case, the cross section fluctuations are most likely due to fluctuations in the radiative capture width, rather than in the neutron width. Finally, the practical effect of the possible presence of width correlations in fertile and fissile nuclides is addressed. 1 figure, 1 table.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6999339
- Report Number(s):
- LA-UR-80-2675; CONF-800942-11; TRN: 80-018315
- Resource Relation:
- Conference: ANS topical meeting on 1980 advances in reactor physics and shielding, Sun Valley, ID, USA, 14 Sep 1980
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NEUTRON REACTIONS
CAPTURE
SPIN
URANIUM 235 TARGET
URANIUM 236
ENERGY LEVELS
URANIUM 238 TARGET
URANIUM 239
CORRELATIONS
CROSS SECTIONS
DATA ANALYSIS
EVALUATED DATA
FLUCTUATIONS
GAMMA RADIATION
INTERMEDIATE NEUTRONS
INTERMEDIATE RESONANCE
INTERMEDIATE STRUCTURE
KEV RANGE 10-100
LEVEL WIDTHS
PARITY
SENSITIVITY ANALYSIS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
ANGULAR MOMENTUM
BARYON REACTIONS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
DATA
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY RANGE
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FERMIONS
HADRON REACTIONS
HADRONS
HEAVY NUCLEI
INFORMATION
IONIZING RADIATIONS
ISOTOPES
KEV RANGE
MINUTES LIVING RADIOISOTOPES
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
NUMERICAL DATA
PARTICLE PROPERTIES
RADIATIONS
RADIOISOTOPES
RESONANCE
TARGETS
URANIUM ISOTOPES
VARIATIONS
YEARS LIVING RADIOISOTOPES
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