RELATIVE CROSS SECTIONS FOR FORMATION OF THE SHIELDED ISOMERIC PAIR Cs$sup 134$m AND Cs$sup 134$ IN MEDIUM ENERGY FISSION

Technical Report · Sun Jul 01 04:00:00 EDT 1962

OSTI ID:4718113

Vandenbosch, R; Warhanek, H

The cross section ratio of Cs/sup 134/ and Cs/sup 134m/ was measured for the fission of U/sup 233/, U/sup 235/, and U/sup 238/ induced by hel ium ions of 42 Mev and by helium ions of lower energy, for fission of U/sup 235/ induced by deuterons of 21 Mev, and for fission of U/sup 233/ induced by gamma rays with an energy of up to 16 Mev. Comparison of the results with calculations based on a statistical theory of the spin distribution of level densities in excited nuclei shows that in the case of low angular momentum of the fissioning nucleus ( gamma -ray induced fission) the fragments are produced with a mean intrinsic angular momentum that is larger than the angular momentum of the fissioning nucleus. It also shows that increased angular momentum of the fissioning nucleus (helium ion induced fission) is at least partially transferred into additional intrinsic angular momentum of the fragments. Measurements of the angular dependence of the isomer ratio gave for the 170 to 90 deg ratio no significant deviation from isotropy. The half life of Cs/sup 134m/ was remeasured and found to be 2.91 plus or minus 0.02 hr in agreement with earlier results. 27 references. (auth)

• Research Organization: Argonne National Lab., Ill.
• DOE Contract Number: W-31109-ENG-38
• NSA Number: NSA-17-024401
• OSTI ID: 4718113
• Report Number(s): TID-16939; UAC-6654
• Country of Publication: United States
• Language: English

Related Subjects

ANGULAR MOMENTUM
BIBLIOGRAPHY
CESIUM 134
CROSS SECTIONS
DEUTERONS
DISTRIBUTION
ENERGY
ENERGY LEVELS
EXCITATION
FISSION
FISSION PRODUCTS
GAMMA RADIATION
HALF-LIFE
HELIUM
IONS
ISOMERS
MEASURED VALUES
MOMENTUM
NUCLEI
NUMERICALS
PHYSICS
SHIELDING
SPIN
STATISTICS
URANIUM 233
URANIUM 235
URANIUM 238