Matches in SemOpenAlex for { <https://semopenalex.org/work/W2198086423> ?p ?o ?g. }
Showing items 1 to 71 of
71
with 100 items per page.
- W2198086423 endingPage "61" @default.
- W2198086423 startingPage "55" @default.
- W2198086423 abstract "Abstract Prompt Fission Neutron Spectra (PFNS) are very important nuclear data for reactor neutronic calculation tools. Most of the international evaluated nuclear data libraries lie on the Madland-Nix model, which is a based on evaporation theory of fission fragments. But very scarce data can be found regarding the PFNS covariance matrix associated to these evaluations. As an illustration of the impact of the PFNS on neutronic calculations, we will show a Monte-Carlo calculation of the neutron flux received by a PWR vessel, using different PFNS evaluations. The neutrons that have the highest probability to contribute to the vessel flux are those that are emitted at the highest energies; however most of the fission neutrons are emitted around 2 MeV. These results show the necessity to have very precise PFNS evaluations, and a proper estimation of associated covariances. The estimation of the PFNS covariance matrix associated to a model, after adjustment of model parameters, will be shown. This is performed by the CONRAD code, developed at CEA Cadarache. The final goal of the study is to adjust the parameters involved in fission fragments de-excitation in the FIFRELIN Monte-Carlo code, also developed at CEA Cadarache, which computes the PFNS among other fission quantities, and to provide the associated PFNS covariance matrix. However for the moment we focused the study on three historically widely used PFNS models: Maxwellian, Watt and Madland-Nix models. The covariance matrix on the adjusted spectrum comes mainly from the systematic uncertainty on some experimental parameters — namely the normalization, background, detection efficiency, etc. In order to propagate this type of uncertainties properly, the marginalization technique is used. A close knowledge of the conditions in which a particular experimental PFNS has been measured is required, in order to have a correct estimation of the PFNS uncertainties after adjustment. In this work, we propagated the uncertainty on normalization of experimental spectra, and the uncertainty on the energy-dependent neutron detection efficiency. We show the resulting PFNS and associated covariance matrix in the case of thermal neutron-induced fission of 235 U and 239 Pu." @default.
- W2198086423 created "2016-06-24" @default.
- W2198086423 creator A5005244603 @default.
- W2198086423 creator A5017183499 @default.
- W2198086423 creator A5048074729 @default.
- W2198086423 creator A5068320444 @default.
- W2198086423 creator A5071777060 @default.
- W2198086423 creator A5027757361 @default.
- W2198086423 date "2015-01-01" @default.
- W2198086423 modified "2023-09-24" @default.
- W2198086423 title "Study on Prompt Fission Neutron Spectra and Associated Covariances for 235U(nth,f) and 239Pu(nth,f)" @default.
- W2198086423 cites W1889861792 @default.
- W2198086423 cites W1982682846 @default.
- W2198086423 cites W1989416600 @default.
- W2198086423 cites W1992330363 @default.
- W2198086423 cites W2035517331 @default.
- W2198086423 cites W2035531413 @default.
- W2198086423 cites W2088902928 @default.
- W2198086423 cites W2260646751 @default.
- W2198086423 cites W2586112574 @default.
- W2198086423 doi "https://doi.org/10.1016/j.phpro.2015.04.008" @default.
- W2198086423 hasPublicationYear "2015" @default.
- W2198086423 type Work @default.
- W2198086423 sameAs 2198086423 @default.
- W2198086423 citedByCount "0" @default.
- W2198086423 crossrefType "journal-article" @default.
- W2198086423 hasAuthorship W2198086423A5005244603 @default.
- W2198086423 hasAuthorship W2198086423A5017183499 @default.
- W2198086423 hasAuthorship W2198086423A5027757361 @default.
- W2198086423 hasAuthorship W2198086423A5048074729 @default.
- W2198086423 hasAuthorship W2198086423A5068320444 @default.
- W2198086423 hasAuthorship W2198086423A5071777060 @default.
- W2198086423 hasBestOaLocation W21980864231 @default.
- W2198086423 hasConcept C121332964 @default.
- W2198086423 hasConcept C12294094 @default.
- W2198086423 hasConcept C131193917 @default.
- W2198086423 hasConcept C152568617 @default.
- W2198086423 hasConcept C172911342 @default.
- W2198086423 hasConcept C185544564 @default.
- W2198086423 hasConcept C198096759 @default.
- W2198086423 hasConcept C4839761 @default.
- W2198086423 hasConcept C62520636 @default.
- W2198086423 hasConceptScore W2198086423C121332964 @default.
- W2198086423 hasConceptScore W2198086423C12294094 @default.
- W2198086423 hasConceptScore W2198086423C131193917 @default.
- W2198086423 hasConceptScore W2198086423C152568617 @default.
- W2198086423 hasConceptScore W2198086423C172911342 @default.
- W2198086423 hasConceptScore W2198086423C185544564 @default.
- W2198086423 hasConceptScore W2198086423C198096759 @default.
- W2198086423 hasConceptScore W2198086423C4839761 @default.
- W2198086423 hasConceptScore W2198086423C62520636 @default.
- W2198086423 hasLocation W21980864231 @default.
- W2198086423 hasOpenAccess W2198086423 @default.
- W2198086423 hasPrimaryLocation W21980864231 @default.
- W2198086423 hasRelatedWork W1516908856 @default.
- W2198086423 hasRelatedWork W1965982317 @default.
- W2198086423 hasRelatedWork W1969134815 @default.
- W2198086423 hasRelatedWork W2052586263 @default.
- W2198086423 hasRelatedWork W206506028 @default.
- W2198086423 hasRelatedWork W2079607965 @default.
- W2198086423 hasRelatedWork W2185308232 @default.
- W2198086423 hasRelatedWork W2220700662 @default.
- W2198086423 hasRelatedWork W3089633085 @default.
- W2198086423 hasRelatedWork W571230409 @default.
- W2198086423 hasVolume "64" @default.
- W2198086423 isParatext "false" @default.
- W2198086423 isRetracted "false" @default.
- W2198086423 magId "2198086423" @default.
- W2198086423 workType "article" @default.