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

C. Guerrero, E. Berthoumieux, D. Cano-Ott, E. Mendoza, S. Andriamonje, J. Andrzejewski, L. Audouin, M. Barbagallo, V. Becares, F. Becvar, F. Belloni, J. Billowes, M. Brugger, M. Calviani, F. Calvino, C. Carrapico, F. Cerutti, E. Chiaveri, M. Chin, N. ColonnaG. Cortes, M. A. Cortes-Giraldo, M. Diakaki, I. Dillmann, C. Domingo-Pardo, I. Duran, C. Eleftheriadis, M. Fernandez-Ordonez, A. Ferrari, S. Ganesan, G. Giubrone, M. B. Gomez-Hornillos, I. F. Goncalves, E. Gonzalez-Romero, F. Gramegna, E. Griesmayer, F. Gunsing, D. Jenkins, E. Jericha, Y. Kadi, F. Kaeppeler, D. Karadimos, J. Kroll, M. Krticka, E. Lebbos, C. Lederer, H. Leeb, R. Losito, M. Lozano, A. Manousos, J. Marganiec, S. Marrone, T. Martinez, C. Massimi, P. F. Mastinu, M. Meaze, A. Mengoni, P. M. Milazzo, C. Paradela, A. Pavlik, J. Perkowski, R. Plag, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, F. Roman, C. Rubbia, R. Sarmento, G. Tagliente, J. L. Tain, D. Tarrio, L. Tassan-Got, A. Tsinganis, G. Vannini, V. Variale, P. Vaz, A. Ventura, M. Vermeullen, V. Vlachoudis, R. Vlastou, A. Wallner, T. Ware, C. Weiss, T. Wright

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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.-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 U-235 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: epsilon(TAC)(n, f), epsilon(TAC)(n, gamma) and epsilon(MGAS)(n, f). In the test measurement we have succeeded in measuring simultaneously with a high total efficiency the U-235 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.

Original languageEnglish
Article number29
Number of pages9
JournalEuropean Physical Journal A: Hadrons and Nuclei
Volume48
Issue number3
DOIs
Publication statusPublished - Mar 2012

Keywords

  • CROSS-SECTIONS
  • SIMULATION
  • TOTAL ABSORPTION CALORIMETER
  • U-235

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