AWhat changed
B. N. Brockhouse and A. T. Stewart used neutron spectroscopy on a single crystal of aluminium to probe lattice vibrations. In Brockhouse’s later account, energy-resolved neutron groups measured at different crystal orientations yielded phonon frequency and wave vector through conservation relations. Subsequent measurements and comparison with other laboratories produced dispersion curves along selected symmetry directions and exposed limitations in simple interatomic-force models.
Scientific scope
B. N. Brockhouse and A. T. Stewart used neutron spectroscopy on a single crystal of aluminium to probe lattice vibrations. In Brockhouse’s later account, energy-resolved neutron groups measured at different crystal orientations yielded phonon frequency and wave vector through conservation relations. Subsequent measurements and comparison with other laboratories produced dispersion curves along selected symmetry directions and exposed limitations in simple interatomic-force models. Brockhouse and Stewart’s 1955 paper is the original aluminium contribution. A later participant account combines measurements from several groups and later work in its dispersion figure, so the full plotted dataset is not attributable solely to the initial experiment. The germanium study with Iyengar is a distinct contribution; uncertainties and the assumptions of lattice models still matter.
Evidence
The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. Brockhouse and Stewart’s 1955 paper is the original aluminium contribution. A later participant account combines measurements from several groups and later work in its dispersion figure, so the full plotted dataset is not attributable solely to the initial experiment. The germanium study with Iyengar is a distinct contribution; uncertainties and the assumptions of lattice models still matter.
Contributors
- The named authors in the research record · SCIENCE: These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.
- Slow neutron spectroscopy and the grand atlas of the physical world
- Scattering of Neutrons by Phonons in an Aluminum Single Crystal
Provisional WRS assessment, edition 2026-10-28.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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