skip to main content

SciTech ConnectSciTech Connect

Title: Covariance Matrix Evaluations for Independent Mass Fission Yields

Recent needs for more accurate fission product yields include covariance information to allow improved uncertainty estimations of the parameters used by design codes. The aim of this work is to investigate the possibility to generate more reliable and complete uncertainty information on independent mass fission yields. Mass yields covariances are estimated through a convolution between the multi-Gaussian empirical model based on Brosa's fission modes, which describe the pre-neutron mass yields, and the average prompt neutron multiplicity curve. The covariance generation task has been approached using the Bayesian generalized least squared method through the CONRAD code. Preliminary results on mass yields variance-covariance matrix will be presented and discussed from physical grounds in the case of {sup 235}U(n{sub th}, f) and {sup 239}Pu(n{sub th}, f) reactions.
Authors:
 [1] ; ; ;  [2] ;  [1]
  1. Industrial Engineering Department (DIN), University of Bologna (Italy)
  2. CEA, DEN, DER/SPRC, Cadarache, F-13108 Saint Paul lez Durance (France)
Publication Date:
OSTI Identifier:
22436787
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nuclear Data Sheets; Journal Volume: 123; Conference: International workshop on nuclear data covariances, Santa Fe, NM (United States), 28 Apr - 1 May 2014; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; DATA COVARIANCES; FISSION PRODUCTS; FISSION YIELD; NEUTRON REACTIONS; NUCLEAR DATA COLLECTIONS; PLUTONIUM 239; PROMPT NEUTRONS; URANIUM 235