/sup 238/U neutron-induced fission cross section for incident neutron energies between 5 eV and 3. 5 MeV
A measurement of the /sup 238/U neutron-induced fission cross section was performed at the ORELA Linac facility in the neutron energy range between 5 eV and 3.5 MeV. The favorable signal-to-background ratio and high resolution of this experiment resulted in the identificaion of 85 subthreshold fission resonances or clusters of resonances in the neutron energy region between 5 eV and 200 keV. The fission data below 100 keV are characteristic of a weak coupling situation between Class I and Class II levels. The structure of the fission levels at the 720 eV and 1210 eV fission clusters is discussed. There is an apparent enhancement of the fission cross section at the opening of the 2/sup +/ neutron inelastic channel in /sup 238/U at 45 keV. An enhancement of the subthreshold fission cross section between 100 keV and 200 keV is tentatively interpreted in terms of the presence of a Class II, partially damped vibrational level. There is a marked structure in the fission cross section above 200 keV up to and including the plateau between 2 and 3.5 MeV. 11 figures and 6 tables.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6199615
- Report Number(s):
- ORNL/TM-6788; ENDF-277; TRN: 79-009984
- Country of Publication:
- United States
- Language:
- English
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Neutron induced /sup 238/U subthreshold fission cross section for neutron energies between 5 eV and 3. 5 MeV. [Resonance, resonance clusters, fission widths, 5 eV to 3. 5 MeV]
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Related Subjects
NEUTRON REACTIONS
FISSION
URANIUM 238 TARGET
CROSS SECTIONS
EPITHERMAL NEUTRONS
EV RANGE 01-10
EV RANGE 10-100
EV RANGE 100-1000
EXCITATION FUNCTIONS
EXPERIMENTAL DATA
FAST FISSION
FAST NEUTRONS
GRAPHS
INTERMEDIATE NEUTRONS
KEV RANGE 01-10
KEV RANGE 10-100
KEV RANGE 100-1000
MEV RANGE 01-10
RESONANCE
RESONANCE NEUTRONS
WEAK-COUPLING MODEL
BARYON REACTIONS
BARYONS
DATA
DATA FORMS
ELEMENTARY PARTICLES
ENERGY RANGE
EV RANGE
FERMIONS
HADRON REACTIONS
HADRONS
INFORMATION
KEV RANGE
MATHEMATICAL MODELS
MEV RANGE
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEONS
NUMERICAL DATA
TARGETS
652026* - Nuclear Properties & Reactions
A=220 & above
Experimental- Spontaneous & Induced Fission- (-1987)