Simultaneous measurement of neutron-induced capture and fission reactions at CERN

Abstract : The measurement of the capture cross-section of fissile elements, of utmost importance for the design of innovative nuclear reactors and the management of nuclear waste, faces particular difficulties related to the γ-ray background generated in the competing fission reactions. At the CERN neutron time-of-flight facility n TOF we have combined the Total Absorption Calorimeter (TAC) capture detector with a set of three 235U loaded MicroMegas (MGAS) fission detectors for measuring simultaneously two reactions: capture and fission. The results presented here include the determination of the three detection efficiencies involved in the process: εTAC(n, f), εTAC(n, γ) and εMGAS(n, f). In the test measurement we have succeeded in measuring simultaneously with a high total efficiency the 235U capture and fission cross-sections, disentangling accurately the two types of reactions. The work presented here proves that accurate capture cross-section measurements of fissile isotopes are feasible at n TOF.
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Contributor : Heurteau Sophie <>
Submitted on : Thursday, May 24, 2012 - 11:00:01 AM
Last modification on : Thursday, May 24, 2012 - 11:00:01 AM

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C. Guerrero, E. Berthoumieux, L. Audouin, F. Gunsing, L. Tassan-Got. Simultaneous measurement of neutron-induced capture and fission reactions at CERN. European Physical Journal A: Hadrons and Nuclei, EDP Sciences: EPJ, 2012, 48, pp.29. <10.1140/epja/i2012-12029-2>. <in2p3-00700873>

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