Published January 1963
| Version v1
Book
Installation for Studying the Scattering of Cold Neutrons
- 1. Ob'edinennyj institut yadernykh issledovanij, Dubna, Union of Soviet Socialist Republics (Russian Federation)
Description
Using the pulsed fut reactor in the Joint Institute for Nuclear Research, an installation was set up to investigate the spectrometry of cold neutrons. The moderator, adjoining the reactor reflector, and the beryllium filter were at the temperature of liquid nitrogen. The scatterer, located at a distance of about 0. 6 m from the moderator, was irradiated by flashes of cold neutrons, whose duration was determined by the lifetime of the neutrons in the moderator and the dispersion of the times-of-flight over a distance of 0. 6 m. The frequency of the flashes was 8/s. The steep beryllium edge of the spectrum, lying around 200 μs, was used for spectrometry in the quasi-elastic range. The energy of the scattered neutrons was determined by the time-of-flight over the distance between scatterer and detector, which was about 10-40 m. ZnS + 10210 O3 scintillation detectors with surfaces of 300 and 2 000 cm2 were used and the efficiency, for fast neutrons, was about 60%. (author)
Abstract (French)
A l'aide du reacteur a flux pulse de neutrons rapides de l'Institut unifie de recherches nucleaires, les auteurs ont mis au point une installation pour la spectrometrie des neutrons thermiques. Le ralentisseur contigu au reflecteur du reacteur et le filtre deberyllium sont maintenus a la temperature de l'azote liquide. Le diffuseur, place a environ 60 cm du ralentisseur, est irradie par une bouffee de neutrons thermiques dont la duree est determinee par la vie moyenne des neutrons dans le ralentisseur et par l'etalement des temps de vol necessaires pour parcourir la distance de 60 cm. La frequence des bouffees est de 8/s. Pour la spectrometrie dans la region quasi-elastique, on utilise la bande en bordure du spectre qui correspond au beryllium et s'etale sur environ 200 μs. L'energie des neutrons diffuses est determinee par la duree du parcours entre le diffuseur et le detecteur. Les auteurs ont utilise des detecteurs a scintillation a ZnS + 10210 O3 ayant des surfaces de 300 et 2 000 cm2 et dont l'efficacite a l'egard des neutrons thermique: est d'environ 60%. (author)Abstract (Spanish)
En el reactor rapido pulsante del Instituto Central de Investigaciones Nucleares se instalo un espectrometro para neutrones frios. El moderador, contiguo al reflector del reactor, y el filtro de berilio se mantienen a la temperatura del nitrogeno liquido. El difusor, situado a unos 0,6 m del moderador, se irradia con rafagas de neutrones frios, cuya duracion se determina em funcion de la vida de los neutrones en el moderador y de la dispersion de los tiempos de vuelo en una distancia de 0,6 m. La frecuencia de las rafagas es de 8 por segundo. Para la espectrometria en la region cuasielastica, se utiliza la variacion brusca del espectro del berilio, que es de unos 200 μs. La enetgia de los neutrones dispersados se determina por el tiempo de vuelo en la distancia que media entre el difusor y el detector, a saber, 10 a 40 m. Los autores utilizan detectores de centelleo a base de ZnS + 10210 O3 de una superficie comprendida entre 300 y 2000 cm2, y cuya eficacia respecto de los neutrones termicos, es del orden de 60%. (author)Additional details
Additional titles
- Original title (English)
- Installation pour l'etude de la diffusion des neutrons thermiques; Ustanovka dlya izucheniya rasseyaniya kholodnykh nejtronov; Instalacion para estudiar la dispersion de neutrones frios
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. 119-125
- 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
- 44045030
- Subject category
- S46: INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- BERYLLIUM; COLD NEUTRONS; FAST NEUTRONS; INSTALLATION; JINR; LIQUIDS; MODERATORS; NEUTRON DIFFRACTION; NITROGEN; SCINTILLATION COUNTERS; TIME-OF-FLIGHT METHOD; ZINC SULFIDES
- Descriptors DEC
- ALKALINE EARTH METALS; BARYONS; CHALCOGENIDES; COHERENT SCATTERING; DIFFRACTION; ELEMENTARY PARTICLES; ELEMENTS; FERMIONS; FLUIDS; HADRONS; INORGANIC PHOSPHORS; INTERNATIONAL ORGANIZATIONS; MEASURING INSTRUMENTS; METALS; NEUTRONS; NONMETALS; NUCLEONS; PHOSPHORS; RADIATION DETECTORS; SCATTERING; SULFIDES; SULFUR COMPOUNDS; ZINC COMPOUNDS
Optional Information
- Notes
- Abstract also available in Russian; 3 figs. Imprint:In two volumes
- Secondary number(s)
- STI/PUB--62(v.1)