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.

Atomistic breathing shell model calculations of dislocation core configurations in ionic crystals

Abstract: A study was undertaken to improve upon a previous rigid boundary atomistic calculation of the core properties of a/2〈110〉{110} edge dislocations in MgO. A flexible boundary method (Flex-II) based on linear elasticity theory and recently developed by Hoagland, Hirth and Gehlen (1976) was used to provide a more accurate determination of the boundary between the atomistic and the elasto-atomic regions. A central-force breathing shell model due to Sangster (1973) was used to take account of many-body effects in the interaction between ions. This marks the first application of the breathing shell model to the calculation of dislocation core configurations in ionic crystals. Within this model two potentials were used. One is due to Sangster (1973), the other is our previously developed Model 1 potential. The results obtained using the above potentials are analysed in terms of the stability of the dislocation symmetry type, the core displacement field, the volume of expansion and the total strain energy...

Data acquisition system for the 8π spectrometer: A multidetector array for γ-ray spectroscopy

Abstract: The data acquisition system for the 8π spectrometer, a multidetector array for γ-ray spectroscopy, is described. It is based on CAMAC modules equipped with a fast auxiliary bus in ECL logic. The system has been designed to handle a high rate of events, each with large information content. To offer maximum flexibility for the many types of experiments envisaged, the logic of the data stream to magnetic tape has been made user selectable. This is achieved through selective hardware triggers, hardwired computations and programmed instructions in a fast microprocessor, which condense the information from each event by extracting its essential features.