PHOTOFISSION IN HEAVY ELEMENTS

Technical Report · Fri Oct 30 23:00:00 EST 1959

OSTI ID:4265013

Katz, L; Baerg, A P; Brown, F; Dyson, P M; Kennedy, J M; Vogt, E

Measurements of photofission cross sections for a number of heavy- element nuclides were made by counting, in an ionization chamber, the fission fragments from foils irradiated in the bremsstrahlung beam of the University of Saskatchewan betatron. Parameters describing the giant-resonance fission cross section sup 237/, Pu/sup 239/, and Am/sup 241/. The yields of fissions are compared with the yields of neutrons measured previously in the same laboratory and the relative probabilities of the reactions ( gamma ,f) and ( gamma ,n) are obtained as a function of energy in a second series of experiments the angular distribution of the fission fragments relative to the photon heam was measured as a function of energy. The nuclides U/sup 233/, U/sup 235/, Np/sup 237/, Pu/sup 239/, and Am/sup 241/ give an isotro pic distribution. The nuclides Th/sup 232/ and U/sup 238/ give an anisotropic distribution of the form 1 + alpha sin/sup 2/ theta , the degree of anisotropy being very large at low energies and falling rapidly with increasing energy. A mixture of 30% Th/sup 230/ and 70% Th/sup 232/ gave an angular distribution indistinguishable from that of pure Th/sup 232/. (auth)

• Research Organization: Univ. of Saskatchewan, Saskatoon; Atomic Energy of Canada Ltd., Chalk River, Ont.
• NSA Number: NSA-13-006961
• OSTI ID: 4265013
• Report Number(s): A/CONF.15/P/200
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

AMERICIUM 241
ANGULAR DISTRIBUTION
ANISOTROPY
BETATRONS
BREMSSTRAHLUNG
CROSS SECTIONS
ENERGY
EQUATIONS
ERRORS
FISSION PRODUCTS
FOILS
GIANT RESONANCE
IONIZATION CHAMBERS
IRRADIATION
MASS NUMBER
MEASURED VALUES
MIXING
NEPTUNIUM 237
NUCLEI
NUMERICALS
PHOTOFISSION
PHOTONEUTRONS
PHYSICS AND MATHEMATICS
PLUTONIUM 239
PRODUCTION
RESOLUTION
RESONANCE
THORIUM 230
THORIUM 232
URANIUM 233
URANIUM 238