Journal ArticleDOI
Momentum Distributions in Liquid 4He
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TLDR
In this article, high-resolution neutron scattering measurements at Q = 23 A−1 of 4He in the low-temperature superfluid and in the normal liquid phase at much higher momentum transfers than in previous measurements were reported.Abstract:
We report high-resolution neutron scattering measurements at Q = 23 A−1 of 4He in the low-temperature superfluid and in the normal liquid phase at much higher momentum transfers than in previous measurements. When the impulse approximation prediction is broadened according to a recent theory for final-state effects, the data are in excellent agreement with ab initio Monte Carlo calculations of momentum distributions, which predict a Bose condensate fraction of 9.2% in the superfluid at T = 0 K.read more
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Measurement of momentum distribution of lightatoms and molecules in condensed matter systems using inelastic neutron scattering
TL;DR: In this article, a review of single-particle momentum distributions in light atoms and molecules is presented with specific emphasis on experimental measurements using the deep inelastic neutron scattering technique at eV energies.
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Bose-Einstein condensation and gauge symmetry breaking
TL;DR: In this paper, the relation between Bose-Einstein condensation and spontaneous gauge symmetry breaking is analyzed, and it is shown that spontaneous breaking of gauge symmetry is the necessary and sufficient condition for BEE.
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Simulation of dynamical properties of normal and superfluid helium.
Akira Nakayama,Nancy Makri +1 more
TL;DR: This simulation demonstrates that the peak enhancement observed in the neutron scattering experiments below the transition temperature arises exclusively from particle exchange, illuminating the role of Bose-statistical effects on the dynamics of the quantum liquid.
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Test of the consistency of various linearized semiclassical initial value time correlation functions in application to inelastic neutron scattering from liquid para-hydrogen.
Jian Liu,William H. Miller +1 more
TL;DR: The good agreement of the results obtained from different correlation functions, their excellent behavior in the spectral moment tests based on the exact moment constraints, and their semiquantitative agreement with the inelastic neutron scattering experimental data all suggest that the LSC-IVR is indeed a good short-time approximation for quantum mechanical correlation functions.
Journal ArticleDOI
Excitations in the quantum liquid (4)He: A review.
TL;DR: The goal is to bring up to date the data, calculations and understanding of the excitations since the books and reviews of the early 1990s and show the interplay of these excitations with other spectacular properties such as superfluidity and the test of fundamental calculations of quantum liquids that is possible.