Evaluation of Tungsten Nuclear Reaction Data with Covariances
- Nuclear Data Section, International Atomic Energy Agency, Vienna (Austria)
- IAEA representative at the NEA Data Bank, Paris (France)
- Oak Ridge National Laboratory, Oak Ridge, TN (United States)
As a follow-up of the work presented at the ND-2007 conference in Nice, additional fast reactor benchmarks were analyzed. Adjustment to the cross sections in the keV region was necessary. Evaluated neutron cross section data files for {sup 180,182,183,184,186}W isotopes were produced. Covariances were generated for all isotopes except {sup 180}W. In the resonance range the retro-active method was used. Above the resolved resonance range the covariance prior was generated by the Monte Carlo technique from nuclear model calculations with the Empire-II code. Experimental data were taken into account through the GANDR system using the generalized least-squares technique. Introducing experimental data results in relatively small changes in the cross sections, but greatly constrains the uncertainties. The covariance files are currently undergoing testing.
- OSTI ID:
- 21163790
- Journal Information:
- Nuclear Data Sheets, Vol. 109, Issue 12; Conference: Workshop on neutron cross section covariances, Port Jefferson, NY (United States), 24-28 Jun 2008; Other Information: DOI: 10.1016/j.nds.2008.11.032; PII: S0090-3752(08)00120-8; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0090-3752
- Country of Publication:
- United States
- Language:
- English
Similar Records
EVALUATION OF TUNGSTEN ISOTOPES IN THE FAST NEUTRON RANGE INCLUDING CROSS-SECTION COVARIANCE ESTIMATION.
Covariances of Evaluated Nuclear Cross Section Data for (232)Th, (180,182,183,184,186)W and (55)Mn