Titlebook: Excitations in Two-Dimensional and Three-Dimensional Quantum Fluids; A. F. G. Wyatt,H. J. Lauter Book 1991 Plenum Press, New York 1991 Cou

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https://doi.org/10.1007/978-981-15-2240-6ive. High resolution neutron scattering studies. of the lineshape exhibited by . have given vivid evidence of the completely different behaviour of the low . phonon spectrum and the high . maxon-roton spectrum as the temperature increases towards ... Recently, Glyde and the author have realized that

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Assembly and Fragmentation of Tat Pores,tions between those excitations. It could reasonably be argued that the most significant features of the excitation spectrum of superfluid .He were known by about 1975, following the classic investigations of Cowley and Woods . at Chalk River, and of the Brookhaven group .. The phonon-maxon-roton di

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Formation and Evolution of Low Mass Starsd .He. The main point is that the helium-helium potentiate has a hard core, e.g. V(r) ∝ (./r).. This means that its Fourier transform V(Q) is extremely large (essentially infinite) at all wavelengths. A theory which expands in powers of V(Q) (as in the formulation of the Glyde-Griffin theory present

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Formation and Evolution of Solids in Spacerotons. We will show that even though the amount of experimental work so far performed on helium in a state of tension is quite small, it is possible to deduce the main features of the variation of the dispersion curve with pressure in surprising detail. Furthermore, the results of the analysis prov

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e measurements were made on the Superthermal UCN Source at the ILL [1]. This source produces UCN’s in liquid He. by down-scattering (phonon-emission) of 10 ? neutrons. The UCN’s produced in this way are stored in the He. container, since they are totally reflected from the walls. The UCN’s can gain