CROSS SECTIONS OF THE FISSION OF U$sup 235$ INDUCED BY INTERMEDIATE ENERGY HELIUM IONS (thesis)
Technical Report
·
OSTI ID:4283357
A detailed study of fission was made so that the experimentally obtained tctal cross section for compound nucleus formation could be compared with theory and so that the fine structure features of fission could be When the form and size of a reactor are given, the neutron flux distribution is known and consequently the heat source distribution. The steady-state temperature examined. U/sup 235/ was irradiated with 20 to 40 Mev helium ions. The fission products were separated radiochemically and assayed in calibrated 2 pi proportional flow and Nal(Tl) crystal scintillation counters. Fission studies made at 39.9, 33.8, 28.2, 23.1, and 20.5 Mev showed several features of fission: The fission is predominately asymmetric with the symmetric mode increasing rapidly throughout the range. The cross section data obtained corresponds to compound nuclear theory using a radius parameter of r/ = 1.5 x 10/sup -13/ cm. As previously observed for other nuclides, the valley to peak ratio of fission can be related to the excitation energy of the compound nucleus. A fewer number of neutrons emitted per fission is found than previously reported. Other features of fission such as shell effects and the ''primary'' or ''independent'' yield problem are also discussed. The appendices contain information on the chemistry separation-schemes, the 4 pi beta - gamma coincidence methed and the self-absorption, backscattering and geometry factors of a 2 pi beta proportional flow counter for several fission nuclides. (auth)
- Research Organization:
- Purdue Univ., Lafayette, Ind.
- NSA Number:
- NSA-13-010387
- OSTI ID:
- 4283357
- Report Number(s):
- AECU-4044
- Country of Publication:
- United States
- Language:
- English
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Measurements of the 14 MeV fission cross-sections for /sup 235/U and /sup 239/Pu
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Sat Nov 14 23:00:00 EST 1959
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RADIOCHEMICAL STUDIES OF THE FISSION OF U$sup 235$ INDUCED BY HELIUM IONS
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·
Tue Sep 01 00:00:00 EDT 1959
· Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
·
OSTI ID:4215803
Measurements of the 14 MeV fission cross-sections for /sup 235/U and /sup 239/Pu
Thesis/Dissertation
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Thu Dec 31 23:00:00 EST 1981
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OSTI ID:7095704
Related Subjects
ABSORPTION
ALPHA BEAMS
BETA DETECTION
COINCIDENCE METHODS
COMPOUND NUCLEI
CROSS SECTIONS
CRYSTALS
DISTRIBUTION
EMISSION
ENERGY
ENERGY RANGE
EXCITATION
FISSION
FISSION PRODUCTS
FLOW COUNTERS
FOUR-PI COUNTERS
GAMMA DETECTION
IRRADIATION
MASS
MEASURED VALUES
NEUTRONS
NUCLEAR STRUCTURE
NUCLEAR THEORY
NUCLEI
PHYSICS AND MATHEMATICS
PROPORTIONAL COUNTERS
RADIOCHEMISTRY
SCATTERING
SCINTILLATION COUNTERS
SEPARATION PROCESSES
SODIUM IODIDES
STANDARDS
URANIUM 235
ALPHA BEAMS
BETA DETECTION
COINCIDENCE METHODS
COMPOUND NUCLEI
CROSS SECTIONS
CRYSTALS
DISTRIBUTION
EMISSION
ENERGY
ENERGY RANGE
EXCITATION
FISSION
FISSION PRODUCTS
FLOW COUNTERS
FOUR-PI COUNTERS
GAMMA DETECTION
IRRADIATION
MASS
MEASURED VALUES
NEUTRONS
NUCLEAR STRUCTURE
NUCLEAR THEORY
NUCLEI
PHYSICS AND MATHEMATICS
PROPORTIONAL COUNTERS
RADIOCHEMISTRY
SCATTERING
SCINTILLATION COUNTERS
SEPARATION PROCESSES
SODIUM IODIDES
STANDARDS
URANIUM 235