Published January 1963
| Version v1
Book
Comparative Studies of Slow Neutron Scattering by Solid and Liquid Tin
Creators
- 1. Nuclear Physics Division. Aere, Harwell, Didcot, Berks (United Kingdom)
Description
The scattering of 4.0A and 6.2A neutrons by tin as solid (210oC) and liquid (240oC) has been measured. The scattered spectra at six scatter angles between 20o and 90o was analysed by titne-of-flight methods. At the longer wavelength the low intensity elastic scattered peaks are used to derive the incoherent cross-section for tin (0.04 ± 0.01 b ). Sharp steps in scattered spectra for the solid can be identified and similar but broadened steps for the liquid are seen. Using a theory due to Egelstaff, the steps for the solid can be interpreted as the excitation of particular phonons. The single phonon theory for the solid is modified to attempt to account for the different behaviour of the liquids The appreciable scattering observed in the liquid at low energy transfers is not explained in this way. (author)
Abstract (French)
Les auteurs ont mesure la diffusion de neutrons de 4,0A et de 6,2A de longeur de'onde dans de l'etain a l'etat solide (210oC)et de l'etain a l'etat liquide (240oC). Ils ont analyse par des methodes du temps de vol les spectres de diffusion pour six angles de diffusion compris entre 20o) et 90o). Pour la plus grande longueur d'onde, ils ont utilize les pics de diffusion elastique a faible intensite pour determiner la section efncace incoherente dans l'etain (0,04 ±0,01 b. On peut observer des paliers etroits dans les spectres de diffusion pour l'etat solide et des paliers analogues mais plus larges pour l'etat liquide. D'apres une theorie etablie par Egelstaff, on peut interpreter les paliers pour l'etat solide comme etant dus a l'excitation de phonons particuliers. La theorie du phonon simple pour l'etat solide a ete modifiee pour essayer d'expliquer le comportement different de l'etat liquide. La diffusion appreciable observee dans l'etat liquide pour de faibles transferts d'energie ne s'explique pas pour autant. (author)Abstract (Spanish)
Los autores han medido la dispersion de neutrones de 4,0A y 6,2A por estano solido (210oC)) y liquido (240oC). Han analizado, por el metodo del tiempo de vuelo, los espectros de dispersion en seis angulos distintos, com- prendidos entre 20o) y 90o). En el caso de la longitud de onda mas elevada, utilizan los picos de dispersion elastica de baja intensidad para deducir la seccion eficaz incoherente del estano (0,04 ± 0,01 b ). En el estano solido es posible identificar saltos acusados, en tanto que en el estano liquido se observan saltos analogos, pero de base mas ancha. Aplicando una teoria debida a Egelstaff, es posible atributa los saltos correspondientes al estano solido a la excitacion de determinados fonones. Para poder aclarar el comportamiento diferente del estano liquido, los autores modifican la teoria del fonon unico correspondiente al solido. Sin embargo, queda sin explicar la considerable dispersion observada en el estano liquido en el caso de trans- ferencias de baja energia. (author)Additional details
Additional titles
- Original title (English)
- Etude comparee de la diffusion de neutrons lents par de l'etain solide et de l'etain liquide; Sravnitel'noe issledovanie rasseyaniya medlennykh nejtronov tverdym i zhidkim olovom; Estudio comparativo de la dispersion de neutrones lentos por estano solido y liquido.
Publishing Information
- Publisher
- IAEA
- Imprint Place
- Vienna (International Atomic Energy Agency (IAEA))
- Imprint Title
- Inelastic Scattering of Neutrons in Solids and Liquids. V. I. Proceedings of the Symposium on Inelastic Scattering of Neurons in Solids and Liquids
- Imprint Pagination
- 486 p.
- Series
- Proceedings Series
- Journal Page Range
- p. 237-248
- ISSN
- 0074-1884
Conference
- Title
- Symposium on Inelastic Scattering of Neutrons in Solids and Liquids
- Dates
- 10-14 Sep 1962
- Place
- Chalk River (Canada)
INIS
- Country of Publication
- International Atomic Energy Agency (IAEA)
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 44045039
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- CROSS SECTIONS; ENERGY TRANSFER; EXCITATION; LIQUIDS; NEUTRON DIFFRACTION; PHONONS; SLOW NEUTRONS; SOLIDS; SPECTRA; TEMPERATURE DEPENDENCE; TIN; WAVELENGTHS
- Descriptors DEC
- BARYONS; COHERENT SCATTERING; DIFFRACTION; ELEMENTARY PARTICLES; ELEMENTS; ENERGY-LEVEL TRANSITIONS; FERMIONS; FLUIDS; HADRONS; METALS; NEUTRONS; NUCLEONS; QUASI PARTICLES; SCATTERING
Optional Information
- Notes
- Abstract also available in Russian; 6 figs., 6 refs. Imprint:In two volumes
- Secondary number(s)
- STI/PUB--62(v.1)