From abstract: "The variation of the reactivity of a pile as a function of width of a transverse gap is obtained. The method involves first finding the boundary condition satisfied by the flux at the gap face. This, in principle, provides enough information for a complete solution of the pile equations. A method for calculating the reactivity change is presented. The calculated reactivity is compared with experiment and a brief discussion of the validity of the approximations is given."

NpC and Pu{sub 2}O{sub 3} have been identified by x-ray diffraction. NpC is face-centered cubic, NaCl structure with a = 5.004 {+-} 0.005 A Pu{sub 2}O{sub 3} is isomorphous with the hexagonal ''A form'' for the rare earth sesquioxides with a = 3.840 {+-} 0.004 A; c = 5.957 {+-} 0.006 A and has essentially the same atomic parameters at La{sub 2}O{sub 3}. The lattice dimensions are smaller than predicted for pure Pu{sub 2}O{sub 3}, implying that the average oxidation number of plutonium is between (III) and (IV).

Report presenting an investigation to determine the effects of dual-rotation propeller operation at high thrust on the static longitudinal stability characteristics of a semispan powered model representing a twin-engine airplane configuration with flaps retracted. Stability and trim changes associated with an extreme constant power conditions were greatly dependent on tail height and vertical location of the center of gravity. Results regarding basic data, effects of power on overall stability and trim, and tuft-grid flow surveys are provided.

The following report describes the crystal structures of NpC and Pu2O3 identified by x-ray diffraction.

This quarterly progress report details the ongoing research happening at the Oak Ridge National Laboratory. In particular, this report discusses the current status of the Homogenous Reactor Experiment, boiling reactor and slurry studies, and general homogenous reactor studies.

Analysis of the problem of accelerating ions in a Thomas cyclotron has been confined almost entirely to the integration of various equations of motion (for single particles) for which a complete field description is necessary. In contrast, the problem of principal interest to rf system engineers concerns the gross transfer of electrical energy from an rf generator into an accelerated beam.