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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Raman Scattering from Superfluid Helium,ugh the the concept of the two-roton bound state was criticized,. the model based on quasiparticle interactions was widely accepted for analyses of both neutron and Raman scattering experiments. I refer the readers to the conference proceedings for the works along this line..

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Discussion on Excitations in Bulk 4He,ximate variational quasiparticle states. The achievements of this approach are impressive and numerous: correct ground state energy, correct phonon-roton spectrum, multiparticle terms S(q,.), and a condensate fraction ≈ 10%. A weakness is that the theory has not been fully extended to finite tempera

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NATO Science Series B:http://image.papertrans.cn/e/image/318391.jpg

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Mining and the Nature of Gold Deposits Hitherto scattering has been has been seen with thermal populations. which confines the wavevector to values very near that of the roton minimum., and averages over all angles between the two scattering rotons. Preliminary results using QE indicate a strong wavevector dependence of the scattering cross-sectionl..

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https://doi.org/10.1007/978-981-13-2535-9e condensed matter, and supplies information of elementary processes without thermal average. They found a dramatic increase of the scattering cross section as the probe roton momentum* increases from 2.0 to 2.2Å..

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Roton-Roton Scattering, Hitherto scattering has been has been seen with thermal populations. which confines the wavevector to values very near that of the roton minimum., and averages over all angles between the two scattering rotons. Preliminary results using QE indicate a strong wavevector dependence of the scattering cross-sectionl..

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