Atomic Energy of Canada Limited

About: Atomic Energy of Canada Limited is a company organization based out in Ottawa, Ontario, Canada. It is known for research contribution in the topics: Neutron & Zirconium alloy. The organization has 4845 authors who have published 4826 publications receiving 102951 citations.

Distribution of Prompt-Neutron Emission Probability for the Fission Fragments of U 233

Abstract: The kinetic energies of both members of coincident fragment pairs were measured in a double back-to-back grid ionization chamber. The pulse heights were recorded only when coincident with a prompt fast neutron detected in either one of two neutron counters placed on opposite sides of the fission chamber. The strong angular correlation of the direction of motion of the prompt fission neutrons with the direction of motion of the emitting fragment permitted the identification of the latter as the emitting fragment. The frequency distributions of modes obtained by gating with a neutron from the light or from the heavy fragment were compared with the distribution recorded without a neutron coincidence. Comparison of the three sets of data show (1) that neutron emission from the light fragment predominates at low mass ratios, whereas at high mass ratios neutron emission from the heavy fragment is more probable; (2) that a broad maximum in the total neutron yield exists in the region of the most probable fission mode; and (3) that the average total kinetic energy curve is essentially the same for the three conditions of measurement.

Identification and genetic characterization of mutants of bacteriophage T4 defective in the ability to induce exonuclease A.

Abstract: A mutant of bacteriophage T4 unable to induce exonuclease A has been isolated. The mutation responsible for this defect maps between genes 39 and 56, in a region of the chromosome devoid of other known markers. Four deletion mutants lacking part of the genome located between genes 39 and 56 also fail to induce exonuclease A. The ability of all of these mutants to replicate suggests that exonuclease A is not essential for replication of phage T4.

Promotion of Radiation Peroxidation in Models of Lipid Membranes by Caesium and Rubidium Counter-ions: Micellar Linoleic and Linolenic Acids

Abstract: SummaryCaesium and rubidium counter-ions increase peroxidation in irradiated micelles of linoleic (18 : 2) and linolenic (18 : 3) acids. The effect is specific to Cs+ and Rb+ in the alkali metal series. The effect is independent of the salts used (Cl−, NO3−, ClO4−) and, therefore, independent of the chaotropic nature, and reactivity with hydroxyl radicals of Cl−, NO3− and ClO4−. The promotion of peroxidation by Cs+ and Rb+ is interpreted in terms of their effect on fatty acid micelle structure. The dependence of radiation peroxidation on lipid structure in the micelles may be significant for studies of peroxidation in highly structured cell membranes.