COMPUTER PROGRAMS DESCRIBING COLLISION CASCADES IN BINARY MATERIALS. II. WURTZITE STRUCTURE
An IBM 7090 computer program calculates the results of knock-on cascades initiated by the injection of a single atom into a binary solid. The program represents an extension to the real wurtzite structure of beryllium oxide, of an earlier calculation in which, for simplicity, the cascade was confined to a square planar lattice. Interactions between atoms are computed using a hard sphere approximation to the Bohr screened coulomb potential. Output from the computer includes a complete cascade history, including range and displacement statistics, and a listing of the final pattern of point defects. The program is designed to assist in interpreting the results of ion bombardment experiments on BeO. (auth) the neutron muitiplication factor as a function of temperature, and values of the effective resonance integral as a function of temperature were calculated. Measurements of the reactivity coefficients of Al--Pu fuel rods were made in the PCTR to verify the reiative Pu content as given by chemical analysis and to investigate the uniformity of Pu concentration. The momentum distribution of BETA particles from the decay of Lu/sup 176m/ was measured; two components with relative intensities of 44 and 56% were identified. Internal-conversion electrons from Hf/sup 176/ L and M shells were observed for an 88.4 kev gamma transition also. A ratio of the intensity of the L to M electrons of 3 e due to uraniu 0.3 was obtained. A value of zero was selected for the quantum number k of the Lu/sup 176m/ level. Critical mass measurements were continued on plutonium nitrate solutions in a 14-inch diameter sphere to determine the effects of concrete reflectors on the criticality of the vessel and the effect of an air gap between these reflectors and the core. The results verify that a 10-inch layer of concrete is a better reflector than water, the critical concentration was about 10 to 12% less than when the sphere is reflected with water. The effect of an air gap between the core and reflector varied with Pu concentration and total nitrate. Experiments with a water-reflected sphere were also performed. (D.C.W.)
- Research Organization:
- General Electric Co. Flight Propulsion Lab. Dept., Cincinnati
- DOE Contract Number:
- AT(40-1)-2847
- NSA Number:
- NSA-17-024036
- OSTI ID:
- 4720700
- Report Number(s):
- GEMP-200
- Country of Publication:
- United States
- Language:
- English
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