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Author Hoffman, M. M.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ ANGULAR DISTRIBUTION ♦ ANGULAR MOMENTUM ♦ BINDING ENERGY ♦ ELECTRIC FIELDS ♦ EMISSION ♦ FISSION ♦ FISSION PRODUCTS ♦ GAMMA RADIATION ♦ MEASURED VALUES ♦ MOMENTUM ♦ MOTION ♦ NUCLEAR MODELS ♦ NUMERICALS ♦ PLUTONIUM 239 ♦ QUADRUPOLES ♦ ROTATION ♦ THERMAL NEUTRONS ♦ TRANSIENTS ♦ URANIUM 233 ♦ URANIUM 235
Abstract Prompt fission gamma -ray intensity as a function of the angle from the fragment direction was measured for the thermal neutron fission of U/sup 233/, U/ sup 235/, and Pu/sup 239/. For each of these three nuclides, the fission gamma rays were found to be emitted preferentially in the direction of fragment motion by as much as 15%. It was found that the experimental data were best fitted by assuming that gamma rays emitted by fission fragments have two components with different angular distributions. One component, accounting for about 85% of the gamma rays, was isotropic about the fission fragment direction. The remaining 15% had the angular distribution of gamma rays from quadrupole transitions of nuclei having approximately 7 units of angular momentum distributed in, or near a plane perpendicular to the direction of fragment motion. A calculation of the torque resulting from electrostatic forces between the fission fragments is discussed. Results of this calculation indicate that these electrostatic forces could give rise to the fragment rotations indicated by the gamma - ray measurements. (auth)
ISSN 0031899X
Educational Use Research
Learning Resource Type Article
Publisher Date 1964-02-10
Publisher Department Los Alamos Scientific Lab., N. Mex.
Journal Physical Review
Volume Number 133
Organization Los Alamos Scientific Lab., N. Mex.


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