Journal Article10.1016/0168-9002(94)91174-6
Cross section models for cold neutron scattering from liquid hydrogen and liquid deuterium
N. Morishima,D. Mizobuchi +1 more
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TL;DR: In this paper, cross-section models for neutron scattering from liquid hydrogen and liquid deuterium are developed based on the proper treatment of molecular motions in the liquids in terms of individual translations and intermolecular correlations.
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Abstract: For the evaluation of cold and ultracold neutron production, cross section models for neutron scattering from liquid hydrogen and liquid deuterium are developed. They are based on the proper treatment of molecular motions in the liquids in terms of individual translations and intermolecular correlations. Intramolecular motions such as nuclear spin correlations, free rotations and harmonic vibrations are also included. The calculated results agree very well with the experimental results, both double-differential and total, at different temperatures between the melting and boiling points in different ortho-para contents for a wide range of incident neutron energies. It is expected that the present models serve as cross-section data for the optimum design of advanced neutron sources.
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Citations
Microscopic self-dynamics in liquid hydrogen and in its mixtures with deuterium
TL;DR: In this paper, the authors measured the dynamic structure factor of liquid parahydrogen, pure and mixed with deuterium, in various thermodynamic conditions using incoherent inelastic neutron scattering.
18
Velocity autocorrelation in liquid parahydrogen by quantum simulations for direct parameter-free computations of neutron cross sections
Eleonora Guarini,Martin Neumann,Ubaldo Bafile,Milva Celli,Daniele Colognesi,E. Farhi,Y. Calzavara +6 more
TL;DR: In this paper, the authors used centroid molecular dynamics (CMD) quantum simulations of the velocity autocorrelation function to obtain the correct absolute-scale cross section values without the need of introducing any empirically adjusted quantity.
16
Cross-section model for cold neutron scattering in solid and liquid methane
N. Morishima,Y. Sakurai +1 more
TL;DR: In this paper, a space-time correlation approach is used to describe a double-differential scattering cross-section which is basically expressed by a generalized frequency distribution, including molecular translations and rotations as well as intramolecular vibrations.
10
Collective dynamics of liquid deuterium: Neutron scattering and approximate quantum simulation methods
Eleonora Guarini,Fabrizio Barocchi,Alessio De Francesco,Ferdinando Formisano,A. Laloni,Ubaldo Bafile,Milva Celli,Daniele Colognesi,Renato Magli,Alessandro Cunsolo,Martin Neumann +10 more
TL;DR: In this paper, a comprehensive analysis of neutron Brillouin scattering on the semiquantum deuterium liquid is presented, which demonstrates that experiment and current semiclassical simulation methods deliver different results for the principal manifestation of the quantum nature of cold liquids in their dynamical properties.
9
A new thermal neutron scattering kernel for liquid hydrogen
TL;DR: In this article, a new description of the interaction of slow neutrons with this cryogenic moderator is presented, where the molecular translational motion, for both diffusive and collective degrees of freedom, has been reanalysed and represented by a different spectral frequency distribution compared to existing ones.
8
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•Book
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I. I. Gurevich,L. V. Tarasov,Robert S. Shankland +2 more
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