Low-momentum-transfer neutron scattering in liquid helium PDF Download
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Author: A. D. B. Woods
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Category :
Languages : en
Pages : 0
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Book Description
Author: A. D. B. Woods
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Author: A. D. B. Woods
Publisher:
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Category :
Languages : en
Pages : 0
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Author: Atomic Energy of Canada Limited
Publisher:
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Category :
Languages : en
Pages : 5
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Author: L. Goldstein
Publisher:
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Category : Helium
Languages : en
Pages : 16
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Book Description
Author: Leonard Julius Rodriguez
Publisher:
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Category : Neutrons
Languages : en
Pages : 240
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Book Description
Author: S. W. Lovesey
Publisher: Springer Science & Business Media
ISBN: 3642811132
Category : Science
Languages : en
Pages : 391
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Book Description
Inelastic neutron scattering is a well established and important technique for studying the dynamical properties of condensed matter at the atomic level. Often, as is the case of experiments designed to study motions of hydrogen atoms, or magnetic excitations, it may yield information obtainable in no other way. Our aim in assembling this book is to produce an overview of some research topics which have come to the fore recently with the development of high neutron fluxes and high performance inelastic scattering spectrometers. The topics dis cussed here are, by and large, developing rapidly and have not reached the stage at which definitive accounts are always possible. Authors have not therefore attempted to make an extensive review of their topic, and the papers quoted in the text are, in general, those which are seen as having been important in its develop ment (they date, roughly, from the 1971 IAEA conference on neutron scattering held in Grenoble). Basic phenomena are illustrated for the most part by the discussion of one, or two, typical examples. The authors hope that the book will be useful to researchers who are not yet fully aware of the diverse range of problems to which the technique can be applied, and to students beginning research work. For this reason, the first chapter by S. w.
Author: P. Martel
Publisher:
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Category :
Languages : en
Pages : 0
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Category : Nuclear energy
Languages : en
Pages : 1118
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Author:
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Category : Neutrons
Languages : en
Pages : 492
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Author:
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Category :
Languages : en
Pages :
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The appearance of the superfluid phase, with its unique macroscopic properties, and the success of the 'two-fluid' model in describing the transport properties are intimately linked to the Bose statistics obeyed by 4He atoms. The most direct signature of the Bose condensate is in the single particle momentum distribution n(p). In the normal liquid the momentum distribution has a broad Gaussian shape, as predicted for classical systems, with a width determined by the quantum zero point motion. In the superfluid phase a new feature appears, the Bose condensate. The condensate appears as a delta-function singularity in n(p) with an intensity proportional to n0, the condensate fraction. There has been extensive experimental work attempting to verify the existence of the condensate. Hohenberg and Platzman originally suggested that inelastic neutron scattering at high momentum transfer Q, where the Impulse Approximation IA can be used to directly relate the observed scattering to n(p), could provide a means of directly observing the condensate. In this review we will concentrate on recent experimental studies that utilize the large flux of high energy neutrons available at spallation neutron sources. These sources, which have become available only recently, have made it possible to make detailed measurements at large enough momentum transfers that the conditions for the Impulse Approximation are approximately satisfied. While deviations from the IA are still present at these higher Q's, they are more amenable to theoretical treatment and detailed predictions are available. Thus, even though no distinct condensate peak is observed, for the first time excellent agreement with the theoretical predictions for n(p) can be obtained. 50 refs., 12 figs.
