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The Resonance Absorption Spectrum of Uranium
A model for the capture spectrum of uranium is introduced in which levels occur at 7, 30, 30+D, 30+2D, ..., ev. Gamma ray and neutron widths are derived from the experimental data for values of D between 10 and 25 ev. The constants of the 7 volt level prove to be independent of D. Extrapolation, using the one level formula, gives a capture cross section at (1/40) ev of 4.9 x 10(24) cm2; this number is, however, quite sensitive to the value taken for the resonance activation. Both neutron and gamma ray widths for the higher levels are approximately proportional to D.
Date:
November 24, 1943
Creator:
Dancoff, Sidney M., 1913-1951
System:
The UNT Digital Library
Low-Density UO2 Pile
The multiplication factor and minimum pile size for a multiplying pile using UO2 powder of density 1 have been computed. It appears that a k of 1.0177 is possible for a volume ration of V/V001=3.33.
Date:
February 24, 1943
Creator:
Ibser, H. W.
System:
The UNT Digital Library