Published March 1962
| Version v1
Book
Neutron capture cross-sections for energies above a few hundred electron-volts
Description
A series of measurements at Oak Ridge National Laboratory provides extensive information on neutron radiative capture cross-sections at intermediate energies. The cross-sections of about 50 elements have been determined, relative to the known absorption cross-section of indium, for neutron energies near 30 and 65 keV obtained with a pulsed positive-ion accelerator. Normalizing to these cross-sections, the radiative capture cross-sections of about 30 elements have been measured as a function of neutron energy from 0.2 to 170 keV. To cover this range both chopper and pulsed-accelerator techniques have been utilized. Statistical model curve-fits of the latter data for heavy nuclei, where the keV cross-sections are an average over many resonances, are generally in good agreement with the average nuclear parameters obtained from recent low-energy total cross-section results. (author)
Abstract (French)
Une serie de mesures faites au Laboratoire national d'Oak Ridge donnent des renseignements tres complets sur les sections efficaces de capture radiative de neutrons intermediaires. On a determine les sections efficaces d'une cinquantaine d'elements par rapport a la section efficace d'absorption deja connue de l'indium, au moyen de flux puises de neutrons d'energies voisines de 30 et de 65 keV, produits par un accelerateur d'ions positifs. En normalisant par rapport a ces sections efficaces, on a mesure les sections efficaces de capture radiative d'une trentaine d'elements en fonction de l'energie des neutrons entre 0,2 et 170 keV. Pour couvrir ce domaine d'energie, on a utilise des methodes faisant appel a la fois aux selecteurs rapides et aux accelerateurs puises. Les courbes types ajustees statistiquement a ces dernieres donnees pour les noyaux lourds - ou les sections efficaces, pour des energies de l'ordre du kiloelectronvolt , sont une moyenne prise sur de nombreuses resonances - sont generalement en bon accord avec les parametres nucleaires moyens obtenus a partir des mesures recentes de sections efficaces totales pour des basses energies. (author)Abstract (Spanish)
En el Oak Ridge National Laboratory se ha efectuado una serie de mediciones que proporcionan una amplia informacion sobre las secciones eficaces de captura radiativa de neutrones a energias intermedias. Se han determinado las secciones eficaces de captura de unos 50 elementos, refiriendolas a la seccion eficaz de absorcion del indio, ya conocida, para energias neutronicas del orden de 30 y 65 keV, obtenidas con un acelerador pulsado de iones positivos. Tomando como norma esas secciones eficaces, se han medido las secciones eficaces de captura radiativa de unos 30 elementos en funcion de energias neutronicas comprendida entre 0,2 y 170 keV. Para abarcar ese intervalo, se han empleado interruptores de haz y aceleradores pulsados. La representacion grafica de estos ultimos datos correspondiente s a nucleos pesados conforme al modelo estadistico, en que las secciones eficaces keV constituyen un promedio que abarca muchas resonancias, concuerda por lo general en forma satisfactoria con los parametros nucleares medios obtenidos a partir de los resultados recientes de las secciones eficaces totales a bajas energias. (author)Abstract (Russian)
Seriya izmerenij v Okridzhskoj natsional'noj laboratorii (1, 2, 3) predusmatrivaet shirokuyu informatsiyu po voprosam secheniya radiatsionnogo zakhvata nejtronov promezhutochnykh ehnergij. Opredeleny poperechnye secheniya pochti 50 ehlementov otnositel'no izvestnogo secheniya pogloshcheniya indiya dlya ehnergij nejtronov blizkikh k 30 i 65 kiloehlektronovol' t pri pomoshchi impul'snogo uskoritelya polozhitel'no zaryazhennykh ionov. Normirovannye k ehtim poperechnym secheniyam, secheniya radiatsionnogo zakhvata priblizitel'no 30 ehlementov byli izmereny kak funktsiya ehnergii nejtronov ot 0,2 do 170 kiloehlektronovol't . CHtoby pokryt' ehtot diapazon ispol'zovalis' selektor nejtronov i impul'snyj uskoritel'. Statisticheskaya model' podgonok ehksperimental'ny kh krivykh dlya tyazhelykh yader soglasno poslednim dannym, gde poperechnye secheniya v kiloehlektronvol'ta kh yavlyayutsya srednim chislom dlya mnogikh rezonansov, nakhodyatsya v khoroshem sootvetstvii so srednimi yadernymi parametrami, poluchennymi iz nedavnikh rezul'tatov o polnykh secheniyakh pri malykh ehnergiyakh. (author)Additional details
Additional titles
- Original title (English)
- Mesures de sections efficaces de capture de neutrons au-dessus de quelques centaines d'electronvolts; Sechenie zakhvata nejtronov dlya ehnergij vyshe neskol'kikh soten ehlektron-vol't; Secciones eficaces de captura neutronica para energias superiores a algunos cientos de electron-voltios
Publishing Information
- Publisher
- Globus, Druck- und Verlagsanstalt, Vienna
- Imprint Place
- Vienna (International Atomic Energy Agency (IAEA))
- Imprint Title
- Physics of Fast and Intermediate Reactors. V. I. Proceedings of the Seminar on the Physics of Fast and Intermediate Reactors. V. I
- Imprint Pagination
- 500 p.
- Series
- Proceedings Series
- Journal Page Range
- p. 95-109
- ISSN
- 0074-1884
Conference
- Title
- Seminar on Physics of Fast and Intermediate Reactors
- Dates
- 3-11 Aug 1961
- Place
- Vienna (Austria)
INIS
- Country of Publication
- International Atomic Energy Agency (IAEA)
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 44032433
- Subject category
- S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- ABSORPTION; ACCELERATORS; CAPTURE; CATIONS; ENERGY DEPENDENCE; HEAVY NUCLEI; INDIUM; KEV RANGE; NEUTRON REACTIONS; NEUTRONS; ORNL; STATISTICAL MODELS; TOTAL CROSS SECTIONS
- Descriptors DEC
- BARYON REACTIONS; BARYONS; CHARGED PARTICLES; CROSS SECTIONS; ELEMENTARY PARTICLES; ELEMENTS; ENERGY RANGE; FERMIONS; HADRON REACTIONS; HADRONS; IONS; MATHEMATICAL MODELS; METALS; NATIONAL ORGANIZATIONS; NUCLEAR REACTIONS; NUCLEI; NUCLEON REACTIONS; NUCLEONS; SORPTION; US AEC; US DOE; US ERDA; US ORGANIZATIONS
Optional Information
- Notes
- 32 refs, 14 figs, 1 tab Imprint:In three volumes
- Secondary number(s)
- IAEA-SM--18/73