International Conference on Nuclear Data for Science and Technology 2007
DOI: 10.1051/ndata:07617

Evaluation of the ¹⁰³Rh neutron cross-section data in the unresolved resonance region for improved criticality safety

L.C. Mihailescu¹, I. Sirakov¹, R. Capote², A. Borella¹, K.H. Guber³, S. Kopecky¹, L.C. Leal³, P. Schillebeeckx¹, P. Siegler¹, E. Soukhovitskii⁴ and R. Wynants<sup>1

1</sup>  European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, 2440 Geel, Belgium
²  IAEA Nuclear Data Section, Wagramer Strasse 5, 1400 Vienna, Austria
³  Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6356, USA
⁴  Joint Institute for Energy and Nuclear Research, 220109 Minsk-Sosny, Belarus

Liviu.Mihailescu@ec.europa.eu

Published online: 21 May 2008

Abstract
New capture and transmission measurements have been performed at GELINA to improve the neutron induced cross-section data for ¹⁰³Rh in the resonance region. This contribution refers to the evaluation of the neutron cross-section data of ¹⁰³Rh in the unresolved resonance region. The capture measurements were done at a 30 m measurement station using C₆D₆ detectors and applying the total energy detection principle in combination with the pulse height weighting technique. The transmission measurements were performed at a 50 m station using ⁶Li-glass scintillators as neutron detectors. The experimental data have been processed with the AGS code, which includes a full propagation of both correlated and uncorrelated uncertainties. The experimental data are interpreted in terms of average resonance parameters using a generalized single level representation. A link to a dispersive coupled-channel optical model is used for information about the energy dependence of the distant level parameters and the neutron strength functions. This link becomes especially valuable when a dispersive potential as the one derived here is employed after being optimized in a wide energy region. Thus, the consistency between the resonance and the high energy region is ensured.

© CEA 2008