Resonance evaluation of Gadolinium isotopes

¹ Institut de Radioprotection et de Sûreté Nucléarie, Fontenay-aux-Roses, B.P. 17, 92262, FRANCE
² Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, P. O. Box 2008, USA
³ Italian National Agency for New Technologies, Lungotevere Thaon di Revel 76, 00196 Roma, ITALY
⁴ Canadian Nuclear Laboratory, 286 Plant Rd., ON K0J 1J0, Chalk River, CANADA
⁵ University of Bologna and INFN, Via Irnerio 46, 40126 Bologna, ITALY

^* Corresponding author. E-mail: luiz.leal@irsn.fr

Published online: 30 September 2020

Abstract

The objective of this paper is to present the results of an evaluation of the gadolinium isotopes with the main focus on the isotopes ¹⁵⁵Gd and ¹⁵⁷Gd. The evaluations were carried out in the resolved resonance region using the Reich-Moore formalism. The originality on the ¹⁵⁵Gd and ¹⁵⁷Gd evaluations is the addition of new high-resolution capture cross section measurements performed at the neutron time-of-flight, n_TOF facility for enriched samples and the statistical analysis of the resonance parameters. The resonance analysis was performed with the multilevel R-matrix code SAMMY together with the generalized least-squares technique based on the Bayes’ theory.