Prompt fission neutrons -measurement of ν-bar and of the probabilities P(ν) of emission of v-neutrons
Creators
- 1. CEA, Centre d'Etudes Nucleaires de Bruyeres Le Chatel (France)
Description
With a large liquid scintillator in conjunction with a fission-fragment detector, we hope to measure the values of ν-bar and P(v) for different fissile materials to better than 1% in fissions produced by neutrons in the energy range 4-14 MeV. To estimate the various sources of error in these measurements, we have carried out preliminary work on the spontaneous fissions of 252Cf and 240Pu: measurement of the efficiency of the liquid scintillator; variation of ν-bar with the kinetic energy of the fragment detected; variation of the efficiency of the liquid scintillator with the geometry of the fission-fragment detector; correction of the experimental results and experimental check of these corrections. We measured the P(ν) of 252Cf and the ν-bar and P(ν) of 240Pu in spontaneous fission. In absolute values, it is the inexact knowledge of the reference ν-bar (252Cf) which limits the accuracy of these measurements. (author)
Abstract (French)
En utilisant la technique du gros scintillateur liquide associe a un detecteur de fragments de fission, les auteurs envisagent de mesurer a mieux que 1% ν-bar et P(v) pour differents materiaux fissiles, dans les fissions provoquees par des neutrons dans le domaine d'energie compris entre 4 et 14 MeV. A cette fin, pour apprecier l'importance des differentes sources d'erreurs intervenant dans ces mesures, ils ont effectue differents travaux preliminaires pour les fissions spontanees de 252Cf et de 240Pu: mesure de l'efficacite du scintillateur liquide; variation de ν-bar avec l'energie cinetique du fragment detecte; variation de l'efficacite du scintillateur liquide avec la geometrie du detecteur de fragments de fission; corrections des resultats experimentaux, controle experimental de ces corrections. Les resultats presentes concernent la distribution des P(v) pour la fission spontanee de 252Cf et les valeurs de ν-bar et de P(v) pour la fission spontanee de 240Pu. En mesure absolue, c'est l'imprecision avec laquelle on connait la valeur du ν-bar de reference (252Cf) qui limite la precision des mesures. (author)Additional details
Additional titles
- Original title (French)
- Neutrons prompts de fission-mesure de ν-bar et des probabilites P(v) d'emission de v neutrons
Publishing Information
- Publisher
- IAEA
- Imprint Place
- Vienna (Austria)
- Imprint Title
- Nuclear data for reactors. Proceedings of a conference on nuclear data - microscopic cross-sections and other data basic for reactors. V. 2
- Imprint Pagination
- 454 p.
- Series
- Proceedings series
- Journal Page Range
- p. 57-66
- ISSN
- 0074-1884
Conference
- Title
- Conference on nuclear data - microscopic cross-sections and other data basic for reactors
- Dates
- 17-21 Oct 1966
- Place
- Paris (France)
INIS
- Country of Publication
- Austria
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 41011407
- Subject category
- S97: MATHEMATICAL METHODS AND COMPUTING;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- ACCURACY; CALIFORNIUM 252; CORRECTIONS; ERRORS; FISSILE MATERIALS; FISSION FRAGMENTS; FISSION NEUTRONS; GEOMETRY; KINETIC ENERGY; MEV RANGE 01-10; MEV RANGE 10-100; NUCLEAR DATA COLLECTIONS; PLUTONIUM 240; PROBABILITY; SPONTANEOUS FISSION
- Descriptors DEC
- ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; BARYONS; CALIFORNIUM ISOTOPES; DECAY; ELEMENTARY PARTICLES; ENERGY; ENERGY RANGE; EVEN-EVEN NUCLEI; FERMIONS; FISSION; FISSIONABLE MATERIALS; HADRONS; HEAVY NUCLEI; ISOTOPES; MATERIALS; MATHEMATICS; MEV RANGE; NEUTRONS; NUCLEAR DECAY; NUCLEAR FRAGMENTS; NUCLEAR REACTIONS; NUCLEI; NUCLEONS; PLUTONIUM ISOTOPES; RADIOISOTOPES; SPONTANEOUS FISSION RADIOISOTOPES; YEARS LIVING RADIOISOTOPES
Optional Information
- Notes
- 8 refs, 7 figs, 2 tabs Imprint:Published in two volumes
- Secondary number(s)
- IAEA-CN--23/77