10448 K
47 pp.
 
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TitleAbsorption of Thermal Neutrons in Uranium
Author(s)Creutz, E. C. ; Wilson, R. R. ; Wigner, E. P.
Publication DateSeptember 26, 1941
Report NumberA-40
Unique IdentifierACC0142
Other NumbersOSTI ID: 4362161
Research OrgPrinceton Univ., N.J.
Sponsoring OrgU. S. Atomic Energy Commission (AEC)
Other InformationDeclassified December 8, 1955
SubjectPhysics; Absorption; Cadmium; Cyclotrons; Equations; Errors; Fission; Graphite; Manganese; Measured Values; Radiation Detectors; Radioactivity; Slowdown; Spheres; Thermal Neutrons; Uranium; Uranium Oxides; U3O8
Related Web PagesEugene Wigner and Fundamental Symmetry Principles
AbstractA knowledge of the absorption processes for neutrons in uranium is important for planning a chain reaction experiment. The absorption of thermal neutrons in uranium and uranium oxide has been studied. Neutrons from the cyclotron were slowed down by passage through a graphite block. A uranium or uranium oxide sphere was placed at various positions in the block. The neutron intensity at different points in the sphere and in the graphite was measured by observing the activity induced in detectors or uranium oxide or manganese. It was found that both the fission activity in the uranium oxide and the activity induced in manganese was affected by non-thermal neutrons. An experimental correction for such effects was made by making measurements with the detectors surrounded by cadmium. After such corrections the results from three methods of procedure with the uranium oxide detectors and from the manganese detectors were consistent to within a few per cent.
10448 K
47 pp.
 
View Document 
  


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