Resonance shape analysis of neutron capture measurements from xenon spherical samplesO. Litaize1, G. Noguere1, C. de Saint Jean1, P. Mutti2, A. Brusegan3 and F. Corvi3
1 CEA-Cadarache, 13108 Saint-Paul-lez-Durance, France
2 Institute Laue Langevin, BP. 156, 38042 Grenoble Cedex 9, France
3 Institute for Reference Materials and Measurements, Joint Research Center, Retieseweg, 2440 Geel, Belgium
Published online: 21 May 2008
Techniques have been developed in the frame of the CONRAD Nuclear data analysis code in order to take into account the multiple scattering correction for capture yields. The resonance shape analysis of these capture data have to account for these corrections during the fitting procedure. Analytical formulae and Monte Carlo simulations can be performed through Multiple-Scattering-Correction module in the CONRAD code in order to estimate the differential and total capture yields. Monte Carlo method accounts for usual biasing techniques (implicite capture and Russian roulette). This experimental correction procedure is checked against other codes like REFIT and SAMMY which are extensively used for cylindrical sample analysis. In this work, xenon spherical samples have been studied. Capture and transmission measurements of gaseous samples have been performed at the GELINA facility of the Institute for Reference Materials and Measurements (IRMM) by P. Mutti, F. Corvi and A. Brusegan. For the capture measurements, spherical samples with diameter of 8 cm were used. Due to the spherical shape of the sample, equivalent cylinder (h ≈ 5.33 cm) was taken into account in SAMMY or REFIT analysis (spherical model is not implemented in these codes). These results are compared with analysis involving multiple scattering correction for spherical targets available in CONRAD.
© CEA 2008