Searching for a second excitation in the inelastic neutron scattering spectrum of a liquid metal: a Bayesian analysis

Abstract When probed at nanometer and picosecond scales, the properties of a liquid present striking analogies with the ones of the corresponding solid, one of the most surprising is the ability of supporting shear wave propagation, as a rigid medium. Although this evidence is being reported by a gr...

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Autores principales:	Alessio De Francesco, Ubaldo Bafile, Alessandro Cunsolo, Luisa Scaccia, Eleonora Guarini
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/46fc2070437741bf8d15ad6f8e9eb2f7
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spelling	oai:doaj.org-article:46fc2070437741bf8d15ad6f8e9eb2f72021-12-02T15:23:16ZSearching for a second excitation in the inelastic neutron scattering spectrum of a liquid metal: a Bayesian analysis10.1038/s41598-021-93452-w2045-2322https://doaj.org/article/46fc2070437741bf8d15ad6f8e9eb2f72021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-93452-whttps://doaj.org/toc/2045-2322Abstract When probed at nanometer and picosecond scales, the properties of a liquid present striking analogies with the ones of the corresponding solid, one of the most surprising is the ability of supporting shear wave propagation, as a rigid medium. Although this evidence is being reported by a growing number of terahertz scattering measurements, it remains an open question whether it is universal or rather typical of some liquids only. Furthermore, given its elusive signatures in the scattering signal, the detection of this effect appears as a typical case where an unintentional “bias of confirmation” can mislead experimentalists. We thus decided to use a Bayesian inference approach to achieve a probabilistically grounded and evidence-based lineshape modeling of the inelastic neutron scattering spectra from liquid silver, whose simulated density autocorrelations bear evidence of a shear mode propagation over very short distances. The result of our analysis indicates that the observation of any additional, non-longitudinal, acoustic modes in this simple system goes beyond the accuracy of the used scattering method.Alessio De FrancescoUbaldo BafileAlessandro CunsoloLuisa ScacciaEleonora GuariniNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Alessio De Francesco Ubaldo Bafile Alessandro Cunsolo Luisa Scaccia Eleonora Guarini Searching for a second excitation in the inelastic neutron scattering spectrum of a liquid metal: a Bayesian analysis
description	Abstract When probed at nanometer and picosecond scales, the properties of a liquid present striking analogies with the ones of the corresponding solid, one of the most surprising is the ability of supporting shear wave propagation, as a rigid medium. Although this evidence is being reported by a growing number of terahertz scattering measurements, it remains an open question whether it is universal or rather typical of some liquids only. Furthermore, given its elusive signatures in the scattering signal, the detection of this effect appears as a typical case where an unintentional “bias of confirmation” can mislead experimentalists. We thus decided to use a Bayesian inference approach to achieve a probabilistically grounded and evidence-based lineshape modeling of the inelastic neutron scattering spectra from liquid silver, whose simulated density autocorrelations bear evidence of a shear mode propagation over very short distances. The result of our analysis indicates that the observation of any additional, non-longitudinal, acoustic modes in this simple system goes beyond the accuracy of the used scattering method.
format	article
author	Alessio De Francesco Ubaldo Bafile Alessandro Cunsolo Luisa Scaccia Eleonora Guarini
author_facet	Alessio De Francesco Ubaldo Bafile Alessandro Cunsolo Luisa Scaccia Eleonora Guarini
author_sort	Alessio De Francesco
title	Searching for a second excitation in the inelastic neutron scattering spectrum of a liquid metal: a Bayesian analysis
title_short	Searching for a second excitation in the inelastic neutron scattering spectrum of a liquid metal: a Bayesian analysis
title_full	Searching for a second excitation in the inelastic neutron scattering spectrum of a liquid metal: a Bayesian analysis
title_fullStr	Searching for a second excitation in the inelastic neutron scattering spectrum of a liquid metal: a Bayesian analysis
title_full_unstemmed	Searching for a second excitation in the inelastic neutron scattering spectrum of a liquid metal: a Bayesian analysis
title_sort	searching for a second excitation in the inelastic neutron scattering spectrum of a liquid metal: a bayesian analysis
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/46fc2070437741bf8d15ad6f8e9eb2f7
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Searching for a second excitation in the inelastic neutron scattering spectrum of a liquid metal: a Bayesian analysis

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