The Scattering of Slow Neutrons by Ortho and Parahydrogen PDF Download
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Author:
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ISBN:
Category : Hydrogen ions
Languages : en
Pages : 36
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Author:
Publisher:
ISBN:
Category : Hydrogen ions
Languages : en
Pages : 36
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Author: Stig Brimberg
Publisher:
ISBN:
Category : Hydrogen
Languages : en
Pages : 142
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Author:
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Category :
Languages : en
Pages :
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Book Description
Liquid hydrogen is a dense Bose fluid whose equilibrium properties are both calculable from first principles using various theoretical approaches and of interest for the understanding of a wide range of questions in many-body physics. Unfortunately, the pair correlation function g(r) inferred from neutron scattering measurements of the differential cross section d[sigma]/d[Omega] from different measurements reported in the literature are inconsistent. We have measured the energy dependence of the total cross section and the scattering cross section for slow neutrons with energies between 0.43 and 16.1 meV on liquid hydrogen at 15.6 K (which is dominated by the parahydrogen component) using neutron transmission measurements on the hydrogen target of the NPDGamma collaboration at the Spallation Neutron Source at Oak Ridge National Laboratory. The relationship between the neutron transmission measurement we perform and the total cross section is unambiguous, and the energy range accesses length scales where the pair correlation function is rapidly varying. At 1 meV our measurement is a factor of 3 below the data from previous work. We present evidence that these previous measurements of the hydrogen cross section, which assumed that the equilibrium value for the ratio of orthohydrogen and parahydrogen has been reached in the target liquid, were in fact contaminated with an extra nonequilibrium component of orthohydrogen. Liquid parahydrogen is also a widely used neutron moderator medium, and an accurate knowledge of its slow neutron cross section is essential for the design and optimization of intense slow neutron sources. Furthermore, we describe our measurements and compare them with previous work.
Author: T. J. Krieger
Publisher:
ISBN:
Category : Hydrogen
Languages : en
Pages : 44
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Author: Irving Warren Ruderman
Publisher:
ISBN:
Category : LC subject heading
Languages : en
Pages : 40
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Author: L. Olivi
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Category :
Languages : en
Pages : 20
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Author: D. Bally
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Category :
Languages : en
Pages : 6
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Author:
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ISBN:
Category :
Languages : en
Pages :
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Author: Andre Larose
Publisher: Springer Science & Business Media
ISBN: 146846213X
Category : Science
Languages : en
Pages : 528
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Book Description
Solid state physicists have long appreciated the usefulness of thermal neutron scattering in the inves tigation of condensed matter. This technique was first made possible by the advent of the nuclear reac tor and has, since then, undergone many refinements. The developments in this field of research have, we felt, necessitated the making of a comprehensive compilation of the published thermal neutron papers. The large number of titles collected in this book, as well as their diversity and their yearly distribution, reflects the continued contribution of the neutron probe to our understanding of physical systems. This bibliography is an updated and improved version of the one first published by us in March of 1973 under a similar title. Many of the omissions and inconsistencies of the first edition, such as occurred, for example, in the initialing of authors' names, have been corrected. The literature search has been carried back to 1932, the year when the existence of the neutron was experimentally confirmed. Several additional journals have also been searched and brought up to date together with those listed in our first publication. The number of entries is now 8543, an increase of 65 per cent relative to the first edition.
Author: Luis W. Alvarez
Publisher:
ISBN:
Category : Neutrons
Languages : en
Pages : 2
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