Speaker
Dr
Stefan Kopecky
(EC-JRC-IRMM)
Description
In this contribution the efforts made to improve procedures for the analysis of cross section data in the resonance region, both resolved and unresolved, will be reported. The activities have been performed within the EFNUDAT project.
To improve the quality of the resonance parameters deduced from high resolution time-of-flight cross section data two new features have been implemented in the resonance shape analysis code REFIT:
- an algorithm to correct for the gamma-ray attenuation in the sample and for the impact of the resonance strength
- an algorithm to correct for sample inhomogeneities, such as the grain size of powder samples.
For the analysis of experimental observables in the unresolved resonance region a code has been developed which produces a full ENDF-6 compatible description of the average cross sections and includes full covariance information starting from the covariance matrix of experimental data. In addition a procedure to determine:
- the correction factor for transmission data due to the resonance structure in the total cross section; and
- the correction factor for capture data due to self-shielding and multiple scattering, has been developed. The procedure is based on Monte Carlo simulations using MCNP with a link to the resonance structure in terms of probability tables produced by NJOY.
The impact of these improvements will be discussed using the results of transmission and capture cross section measurements on 197Au.
Author
Dr
Stefan Kopecky
(EC-JRC-IRMM)
Co-authors
Dr
Cristian Massimi
(University and INFN sez. Bologna, IT)
Dr
Cristos Lampoudis
(EC-JRC-IRMM)
Dr
Ivan Sirakov
(INRNE, Blvd. Tzarigradsko shausse 72, Sofia, BG)
Dr
Michael Moxon
(Hyde Copse 3 Marcham, UK)
Dr
Peter Schillebeeckx
(EC-JRC-IRMM)