The First Two Decades of Neutron Scattering at the Chalk River Laboratories

نویسندگان

چکیده

The early advances in neutron scattering at the Chalk River Laboratories of Atomic Energy Canada are recorded. From initial nuclear physics measurements National Research Experimental (NRX) reactor came realization that, with flux available and improvements monochromator technology, direct normal modes vibrations solids structure dynamics liquids would be feasible. With further increases Universal (NRU) reactor, development triple-axis crystal spectrometer, invention constant-Q technique, fields lattice magnetism their interpretation terms long-range forces between atoms exchange interactions spins took a major step forward. Experiments were performed over seven-year period on simple metals such as potassium, complex lead, transition metals, semiconductors, alkali halides. These analyzed atomic demonstrated nature forces. first spin wave excitations, magnetite 3D metal alloy CoFe, also this period. numerical estimates superfluid fraction liquid helium II from extensive phonon–roton multiphonon parts inelastic scattering. After two decades, experiments continued until shut-down NRU 2018 disbanding effort 2019, seventy years after experiments.

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ژورنال

عنوان ژورنال: Quantum beam science

سال: 2021

ISSN: ['2412-382X']

DOI: https://doi.org/10.3390/qubs5010003