In this lecture the study of excitations in quantum fluids and solids using neutrons is briefly introduced. The remainder focuses on liquid 4 He, giving a brief historical sketch of ideas on phonons and rotons, a survey of some recent neutron scattering data particularly on the temperature dependence of S(Q, Ω) and a new interpretation of phonons and rotons in superfluid 4He.
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Now at Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716.
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Glyde, H.R. Neutron scattering from liquid 4He. J Low Temp Phys 87, 407–423 (1992). https://doi.org/10.1007/BF00114911
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DOI: https://doi.org/10.1007/BF00114911