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    "title": "Neutron spectroscopy resolves acoustic and optical phonons in germanium",
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        "date": "1994-12-08"
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        "title": "Normal Vibrations of Germanium by Neutron Spectrometry",
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        "description": "The 1957 short paper and the later participant lecture describe related stages of the work. A dispersion figure reproduced in the lecture and the later 1958 analysis must not be attributed solely to the original short publication. The 1959 erratum is associated with the later analysis. The aluminium experiment with Stewart is a distinct contribution.",
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      "statement": "# Neutron spectroscopy resolves acoustic and optical phonons in germanium\n\nB. N. Brockhouse and P. K. Iyengar used neutron spectroscopy to study lattice vibrations in single-crystal germanium. A later participant lecture depicts acoustic and optical phonon branches in two crystal symmetry directions and explains that simple force-constant models did not fully reproduce the measured dispersion.\n\n## Scientific scope\n\nThe 1957 short paper and the later participant lecture describe related stages of the work. A dispersion figure reproduced in the lecture and the later 1958 analysis must not be attributed solely to the original short publication. The 1959 erratum is associated with the later analysis. The aluminium experiment with Stewart is a distinct contribution.\n\n## Reading status\n\nThis is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.\n\n## People and systems\n\nB. N. Brockhouse; P. K. Iyengar\n\nThese 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.\n\n\n\n## Original sources\n\n- [Slow neutron spectroscopy and the grand atlas of the physical world](https://www.nobelprize.org/uploads/2018/06/brockhouse-lecture.pdf)\n- [Normal Vibrations of Germanium by Neutron Spectrometry](https://journals.aps.org/pr/abstract/10.1103/PhysRev.108.894)\n",
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    "title": "Neutron spectroscopy resolves acoustic and optical phonons in germanium",
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    "what_changed": "B. N. Brockhouse and P. K. Iyengar used neutron spectroscopy to study lattice vibrations in single-crystal germanium. A later participant lecture depicts acoustic and optical phonon branches in two crystal symmetry directions and explains that simple force-constant models did not fully reproduce the measured dispersion.",
    "scope": "B. N. Brockhouse and P. K. Iyengar used neutron spectroscopy to study lattice vibrations in single-crystal germanium. A later participant lecture depicts acoustic and optical phonon branches in two crystal symmetry directions and explains that simple force-constant models did not fully reproduce the measured dispersion. The 1957 short paper and the later participant lecture describe related stages of the work. A dispersion figure reproduced in the lecture and the later 1958 analysis must not be attributed solely to the original short publication. The 1959 erratum is associated with the later analysis. The aluminium experiment with Stewart is a distinct contribution.",
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