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: firstname.lastname@example.org
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
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