Published January 1963
| Version v1
Book
The Scattering Law for Room Temperature Light Water
Creators
- 1. Hanford Laboratories, General Electric Company, Richland, WA (United States)
Description
The Hanford triple-axis crystal spectrometer has been used to measure the Egelstaff scattering law for light water at 22oC for neutron wave vector changes up to 14A-1 and energy transfers in the range 0.05 to 0.25 eV. The values of initial neutron energy were 0.15, 0.20, 0.30, and 0.40 eV, and scattering angles ranged from 4oto 72o. Scattering by a vanadium sample at 77oK served to establish the spectrometer resolution and efficiency functions. The scattering law S(α,β) and the generalized frequency distribution p(β) derived from it are in substantial agreement in the overlap region with results obtained by Haywood and Thorson at Chalk River. The function p(6) has been extended to β ∼ 10 to include the region occupied by the lowest molecular vibration level near β= 8 . In this region the measured p(β) has a low sloping plateau, indicating that the vibrational peak has been smeared out by broad instrumental resolution. The normalization integral of the measured p(β) is higher than its theoretical value. (author)
Abstract (French)
Les auteurs ont employe le spectrometre a cristal triaxial de Hanford pour mesurer la loi de diffusion d'Egelstaff dans l'eau legere a la temperature de 22o, pour un vecteur d'ondes neutroniques pouvant atteindre 14A''-''1 et pour des transferts d'energie compris entre 0,05 et 0,25 eV. L'energie neutronique initiale etait de 0,15, 0,20, 0,30 et 0,40 eV et lesjtngles de diffusion etaieni compris entre 4o et 72o La diffusion par un echantillon de vanadium a 77oK a permis d'etablir la resolution du spectrometre ainsi que les fonctions d'efficacite. La loi de diffusion S(α,β) et la distribution des frequences generalisee p(6) qui en derive concordent bien dans la region de recouvrement avec les resultats obtenus par Haywood et Thorson, a Chalk River. La fonction p(β) a ete etendue a β ∼ 10 de maniere a englober la region occupee par le plus bas niveau de vibrations moleculaires, qui se trouve dans le voisinage de β = 8. Dans cette region, la distribution p(β) mesuree comporte un domaine a pente douce, ce qui indique que le pic de vibrations a ete efface a cause de la resolution large des instruments. L'integrale de normalisation de la distribution p(β) mesuree est plus elevee que sa valeur theorique. (author)Abstract (Spanish)
Los autores han utilizado el espectrometro de cristal triaxial de Hanford para determinar la ley de dispersion de Egelstaff en el caso del agua ligera a 22oC, con variacion del vector de onda neuttonica hasta 14A-1 y transferencias de energia del orden de 0,05 a 0,25 eV. Los valores de la energfa neuttonica inicial fueron 0,15, 0,20, 0,30 y 0,40 eV, y los angulos de dispersion variaron de 4o a 72o. La dispersion por una muestra de vanadio a 77oK (25oC) ha servido para determinar el poder de resolucion del espectrometro y las funciones de rendimiento. La ley de dispersion S(α,β) y la distribucion de frecuencia generalizada p(β) derivada de la misma concuerdan esencialmente en la region de superposicion con los resultados obtenidos por Haywood y Thorson en Chalk River. La funcion p(β) se ha ampliado hasta β ∼ 10 a fin de incluir la region ocupada por los niveles de vibracion molecular mues bajos, en las proximidades de β = 8. En este intervalo, la distribucion p(β) medida presenta un rellano de pendiente poco acusada que indica que los picos de vibracion han sido difuminados por el escaso poder de resolucion del instrumento. La integral de normalizacion de los valores medidos de p(β) es superior a su valor teorico.Additional details
Additional titles
- Original title (English)
- Loi de diffusion dans l'eau legere a la temperature ambiante; Zakon rasseyaniya nejtronov legkoj vodoj komnatnoj temperatury; Ley de dispersion del agua ligera a temperatura ambiente
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. 359-371
- 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
- 44045049
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- CHALK RIVER; CRYSTALS; DISTRIBUTION; ENERGY TRANSFER; EV RANGE 01-10; NEUTRONS; RESOLUTION; SCATTERING; SPECTROMETERS; TEMPERATURE RANGE 0273-0400 K; VANADIUM; WATER
- Descriptors DEC
- BARYONS; CANADA; DEVELOPED COUNTRIES; ELEMENTARY PARTICLES; ELEMENTS; ENERGY RANGE; EV RANGE; FERMIONS; HADRONS; HYDROGEN COMPOUNDS; MEASURING INSTRUMENTS; METALS; NORTH AMERICA; NUCLEONS; ONTARIO; OXYGEN COMPOUNDS; TEMPERATURE RANGE; TRANSITION ELEMENTS
Optional Information
- Notes
- Abstract also available in Russian; 9 figs., 14 refs. Imprint:In two volumes
- Secondary number(s)
- STI/PUB--62(v.1)