https://doi.org/10.1051/epjconf/20136205007
Development of an experimental set-up for the measurement of neutron-induced fission and capture cross sections of radioactive fissile nuclei
1 Centre d'Etudes Nucléaires Bordeaux Gradignan, CNRS/IN2P3, Univ. Bordeaux 1, Chemin du Solarium, 33175 Gradignan, France
2 EC-JRC, Institute for Reference Materials and Measurements, Reteiseweg 111, 2440 Geel, Belgium
3 CEA/Saclay – DSM/DAPNIA/SPhN, 91191 Gif-sur-Yvette, France
4 Laboratoire de Physique Subatomique et de Cosmologie, CNRS/IN2P3, Univ. Joseph Fourier, INPG, 53 avenue des Martyrs, 38026 Grenoble Cedex, France
5 Horia-Hulubei National Institute for Physics and Nuclear Engineering, PO Box MG-6, 077125 Bucharest-Magurele, Romania
a e-mail: companis@cenbg.in2p3.fr
Published online: 13 December 2013
A new experimental set-up for a simultaneous measurement of neutron induced capture and fission cross sections was designed, assembled and optimized. The measurements will be performed at GEel LINear Accelerator (GELINA) neutron time-of-flight facility in Belgium, where neutron cross sections can be measured over a wide energy range with high energy resolution. The fission events detector consists of a dedicated multi-plate high efficiency fission ionization chamber (IC). The γ-rays produced in capture reaction are detected by an efficient array of C6D6 scintillators. Fission γ-rays events are distinguished from capture events by the anticoincidence signals from the IC and the C6D6 detectors. For the undetected fission events a correction has to be applied with respect to the efficiency of the IC that should be high and known with a high precision. Another important issue is the good separation between fission-fragment (FF) and the high alpha pile-up. The performances of the IC during test experiments are presented, focusing in particular on the detection efficiency.
© Owned by the authors, published by EDP Sciences, 2013
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
