Measurement of the 236U(n,f) cross section from 170 meV to 2 MeV at the CERN n_TOF facility

Autor(en)

Raúl Sarmento, M Calviani, Javier Praena, N Colonna, Fabio Belloni, Isabel Maria Ferro Goncalves, Pedro Vaz, G Aerts, H Alvarez, Francisco Alvarez-Velarde, Samuel Andriamonje, J Andrzejewski, P Assimakopoulos, Ludmila Audouin, Massimo Barbagallo, Gerald Badurek, P Baumann, Frantisek Becvar, Eric Berthoumieux, Francisco Calvino, Daniel Cano Ott, C. Carrapico, A Carrillo de Albornoz, Paolo Cennini, Vitaly Y. Chepell, E Chiaveri, Guillem Cortes, Aaron Couture, J Cox, Marcus Dahlfors, S David, M. Diakaki, I Dillmann, Rinaldo Dolfini, César Domingo-Pardo, W Dridi, I Duran, C Eleftheriadis, L Ferrant, Arnaud Ferrari, Rebelo Ferreira Marques, H Frais-Koelbl, K Fujii, Walter I. Furman, E Gonzalez - Romero, A Goverdovski, F Gramegna, Erich Griesmayer, Carlos Guerrero, Frank Gunsing, B Haas, Robert C Haight, Michael Heil, Adonai Herrera-Martinez, M Igashira, S Isaev, E Jericha, Franz Käppeler, Yacine Kadi, Dimitrios Karadimos, D Karamanis, M Kerveno, V Ketlerov, Paul Edward Koehler, V Konovalov, E Kossionides, M Krticka, Christos Lampoudis, Claudia Lederer, Helmut Leeb, Alexandre Lindote, I Lopes, M Lozano, S Lukic, J Marganiec, L Marques, S Marrone, Trinitario Martinez, P F Mastinu, Emilio Mendoza, Alberto Mengoni, P M Milazzo, C Moreau, Marita Mosconi, Francisco Neves, Heinz Oberhummer, S O'Brien, M Oshima, J Pancin, C Papachristodoulou, C Papadopoulos, Carlos Paradela, Nikolaos Patronis, Andreas Pavlik, Panagiotis Pavlopoulos, L Perrot, M T Pigni, Ralf Plag, A J M Plompen, A Plukis, Agusti Poch, Carmen Pretel Sanchez, Jose Manuel Quesada Molina, Thomas Rauscher, Rene Reifarth, M Rosetti, Carlo Rubbia, Gérard Rudolf, P Rullhusen, José F. Salgado, Lucia Sarchiapone, Ilias Savvidis, C Stephan, Giuseppe Tagliente, Jose Luis Tain Enriquez, Diego Tarrio, Laurent Tassan-Got, Luís M N Tavora, R Terlizzi, Gianni Vannini, A Ventura, D Villamarin - Fernandez, M. C. Vicente, Vassilis Vlachoudis, R Vlastou, Friedrich Voss, S Walter, Helmut Wendler, Michael Wiescher, Klaus Wisshak

Abstrakt

The neutron-induced fission cross section of (236)U was measured at the neutron Time-of-Flight (n_TOF) facility at CERN relative to the standard (235)U(n, f) cross section for neutron energies ranging from above thermal to several MeV. The measurement, covering the full range simultaneously, was performed with a fast ionization chamber, taking advantage of the high resolution of the n_TOF spectrometer. The n_TOF results confirm that the first resonance at 5.45 eV is largely overestimated in some nuclear data libraries. The resonance triplet around 1.2 keV was measured with high resolution and resonance parameters were determined with good accuracy. Resonances at high energy have also been observed and characterized and different values for the cross section are provided for the region between 10 keV and the fission threshold. The present work indicates various shortcomings of the current nuclear data libraries in the subthreshold region and provides the basis for an accurate re-evaluation of the (236)U(n, f) cross section, which is of great relevance for the development of emerging or innovative nuclear reactor technologies.

Organisation(en)

Isotopenphysik

Externe Organisation(en)

Instituto Tecnológico e Nuclear, European Organization for Nuclear Research (CERN), Universidad de Sevilla, Istituto Nazionale di Fisica Nucleare (INFN), Roma, Instituto Superior Técnico, French Alternative Energies and Atomic Energy Commission (CEA), Universidade de Santiago de Compostela (USC), Centro de Investigaciones Energeticas Medioambientales y Tecnológica, University of Lodz, University of Ioannina, Institut de Physique Nucléaire d'Orsay (IPN), Technische Universität Wien, Centre National de la Recherche Scientifique (CNRS), Strasbourg , Charles University Prague, Universidad Politécnica de Madrid, Universidade de Coimbra, Universitat Politècnica de Catalunya, University of Notre Dame, Centre de Specrométrie Nucleaire et de Spectrométrie de Masse (CSNSM), National Technical University of Athens (NTUA), Karlsruher Institut für Technologie, Università degli studi di Pavia, Universitat de València, Aristotle University of Thessaloniki, International Atomic Energy Agency (IAEA), Joint Institute for Nuclear Research, Institute of Physics and Power Engineering (IPPE), Centre National De La Recherche Scientifique (CNRS), Los Alamos National Laboratory, Tokyo Institute of Technology (TIT), Oak Ridge National Laboratory , National Centre for Scientific Research Demokritos (NCSR), Japan Atomic Energy Research Institute, Pôle universitaire Léonard-de-Vinci, European Commission Joint Research Centre, Universität Basel, Agenzia nazionale per le nuove tecnologie, l’energia e lo sviluppo economico sostenibile

Journal

Physical Review C

Band

84

Anzahl der Seiten

10

ISSN

0556-2813

DOI

https://doi.org/10.1103/PhysRevC.84.044618

Publikationsdatum

2011

Peer-reviewed

Ja

ÖFOS 2012

103014 Kernphysik, 103005 Atomphysik

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/measurement-of-the-236unf-cross-section-from-170-mev-to-2-mev-at-the-cern-ntof-facility(069ba7b8-db83-4c15-b652-5a1d31fb621d).html