Estimated {sup 55}Mn and {sup 90}Zr Cross Section Covariances in the Fast Neutron Energy Region

Journal Article · Mon Dec 15 04:00:00 EST 2008 · Nuclear Data Sheets

DOI:https://doi.org/10.1016/j.nds.2008.11.031· OSTI ID:21163789

Herman, M; Oblozinsky, P ^[1]

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1. National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973-5000 (United States)

We completed estimates of neutron cross section covariances for {sup 55}Mn and {sup 90}Zr, from the keV energy range to 25 MeV, considering the most important reaction channels, total, elastic, inelastic, capture, and (n,2n). The nuclear reaction model code EMPIRE was used to calculate sensitivity to model parameters by a perturbation of parameters that define the optical model potential, nuclear level densities and strength of the pre-equilibrium emission. The sensitivity analysis was performed with the set of parameters which reproduces the ENDF/B-VII.0 cross sections. The experimental data were analyzed and both statistical and systematic uncertainties were extracted from almost 30 selected experiments. Then, the Bayesian code KALMAN was used to combine the sensitivity analysis and the experiments to obtain the evaluated covariance matrices.

• OSTI ID: 21163789
• Journal Information: Nuclear Data Sheets, Journal Name: Nuclear Data Sheets Journal Issue: 12 Vol. 109; ISSN NDTSBA; ISSN 0090-3752
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CROSS SECTIONS
DATA COVARIANCES
ENERGY-LEVEL DENSITY
EVALUATED DATA
EXPERIMENTAL DATA
FAST NEUTRONS
KEV RANGE
MANGANESE 55
MEV RANGE
NUCLEAR DATA COLLECTIONS
NUCLEAR REACTIONS
OPTICAL MODELS
PERTURBATION THEORY
SENSITIVITY ANALYSIS
ZIRCONIUM 90