Evaluation of fast neutron cross sections and covariance matrices of {sup 52}Cr

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:62077

Tagesen, S; Vonach, H ^[1]; Badikov, S A; Pronyaev, V G ^[2]

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1. Univ. of Vienna (Austria)
2. Institute of Physics and Power Engineering, Obninsk (Russian Federation)

A new evaluation of all important cross sections and their covariance matrices for neutrons with energies between 0.637 MeV and 20 MeV interacting with {sup 52}Cr was performed. An extended version of the computer code GLUCS applying a Bayesian approach to the evaluation procedure was used. The results of theoretical model calculations ({sup 52}Cr file from the EFF-2 library) with covariances obtained by method of expert evaluation were used as prior data. All available experimental data for {sup 52}Cr and natural chromium taken from EXFOR library have been considered to obtain the posterior evaluation of cross sections and covariances. Each experimental data set was renormalized or corrected where needed and analyzed with an evaluation of short, medium and large energy range correlation components contributing to the total covariance matrix. At the final stage of the evaluation the consistency conditions between partial cross sections and their sums were imposed and cross-reaction covariances were obtained. All covariance matrices including prior, experimental and posterior have been checked for positive definiteness.

• OSTI ID: 62077
• Report Number(s): CONF-940507--Vol.2
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
66 PHYSICS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CHROMIUM 52
CROSS SECTIONS
G CODES
KEV RANGE 100-1000
MATRICES
MEV RANGE 01-10
NEUTRON REACTIONS