Evaluation of the 103Rh neutron cross-section data in the unresolved resonance region for improved criticality safetyL.C. Mihailescu1, I. Sirakov1, R. Capote2, A. Borella1, K.H. Guber3, S. Kopecky1, L.C. Leal3, P. Schillebeeckx1, P. Siegler1, E. Soukhovitskii4 and R. Wynants1
1 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
Published online: 21 May 2008
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