High-accuracy determination of the U 238 / U 235 fission cross section ratio up to ≈1 GeV at n-TOF at CERN

Author(s)

C. Paradela, M. Calviani, D. Tarrio, E. Leal-Cidoncha, L. S. Leong, L. Tassan-Got, C. Le Naour, I. Duran, N. Colonna, L. Audouin, M. Mastromarco, S. Lo Meo, A. Ventura, G. Aerts, S. Altstadt, H. Alvarez, F. Alvarez-Velarde, S. Andriamonje, J. Andrzejewski, G. Badurek, M. Barbagallo, P. Baumann, V. Becares, F. Becvar, F. Belloni, B. Berthier, E. Berthoumieux, J. Billowes, V. Boccone, D. Bosnar, M. Brugger, F. Calvino, D. Cano-Ott, R. Capote, C. Carrapico, P. Cennini, F. Cerutti, E. Chiaveri, M. Chin, G. Cortes, M. A. Cortes-Giraldo, L. Cosentino, A. Couture, J. Cox, S. David, M. Diakaki, I. Dillmann, C. Domingo-Pardo, R. Dressler, W. Dridi, C. Eleftheriadis, M. Embid-Segura, L. Ferrant, A. Ferrari, P. Finocchiaro, K. Fraval, K. Fujii, W. Furman, S. Ganesan, A. R. Garcia, G. Giubrone, M. B. Gomez-Hornillos, I. F. Goncalves, E. Gonzalez-Romero, A. Goverdovski, F. Gramegna, E. Griesmayer, C. Guerrero, F. Gunsing, P. Gurusamy, R. Haight, M. Heil, S. Heinitz, M. Igashira, S. Isaev, D. G. Jenkins, E. Jericha, Y. Kadi, F. Kaeppeler, D. Karadimos, D. Karamanis, M. Kerveno, V. Ketlerov, N. Kivel, M. Kokkoris, V. Konovalov, M. Krticka, J. Kroll, C. Lampoudis, C. Langer, C. Lederer, H. Leeb, R. Losito, M. Lozano, A. Manousos, J. Marganiec, T. Martinez, S. Marrone, C. Massimi, P. Mastinu, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea, W. Mondelaers, C. Moreau, M. Mosconi, A. Musumarra, S. O'Brien, J. Pancin, N. Patronis, A. Pavlik, P. Pavlopoulos, J. Perkowski, L. Perrot, M. T. Pigni, R. Plag, A. Plompen, L. Plukis, A. Poch, C. Pretel, J. Praena, J. Quesada, T. Rauscher, R. Reifarth, A. Riego, F. Roman, G. Rudolf, C. Rubbia, P. Rullhusen, J. Salgado, C. Santos, L. Sarchiapone, R. Sarmento, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, C. Stephan, G. Tagliente, J. L. Tain, L. Tavora, R. Terlizzi, A. Tsinganis, S. Valenta, G. Vannini, V. Variale, P. Vaz, R. Versaci, M. J. Vermeulen, D. Villamarin, M. C. Vincente, V. Vlachoudis, R. Vlastou, F. Voss, A. Wallner, S. Walter, T. Ware, M. Weigand, C. Weiss, M. Wiesher, K. Wisshak, T. Wright, P. Zugec

Abstract

The U238 to U235 fission cross section ratio has been determined at n-TOF up to ≈1 GeV, with two different detection systems, in different geometrical configurations. A total of four datasets has been collected and compared. They are all consistent to each other within the relative systematic uncertainty of 3-4%. The data collected at n-TOF have been suitably combined to yield a unique fission cross section ratio as a function of neutron energy. The result confirms current evaluations up to 200 MeV. Good agreement is also observed with theoretical calculations based on the INCL++/Gemini++ combination up to the highest measured energy. The n-TOF results may help solve a long-standing discrepancy between the two most important experimental datasets available so far above 20 MeV, while extending the neutron energy range for the first time up to ≈1 GeV.

Organisation(s)

Isotope Physics

External organisation(s)

Universidade de Santiago de Compostela (USC), Commiss European Communities, Joint Res Ctr, Inst Reference Mat & Measurements, European Organization for Nuclear Research (CERN), Centre National De La Recherche Scientifique (CNRS), Istituto Nazionale di Fisica Nucleare (INFN), Roma, Università degli Studi di Salerno, French Alternative Energies and Atomic Energy Commission (CEA), Johann Wolfgang Goethe-Universität Frankfurt am Main, Centro de Investigaciones Energeticas Medioambientales y Tecnológica, University of Lodz, Technische Universität Wien, Centre National de la Recherche Scientifique (CNRS), Strasbourg , Charles University Prague, University of Manchester, University of Zagreb, Universidad Politécnica de Madrid, International Atomic Energy Agency (IAEA), Universitat Politècnica de Catalunya, Universidad de Sevilla, University of Notre Dame, National Technical University of Athens (NTUA), Karlsruher Institut für Technologie, Instituto de Física Corpuscular (IFIC), Paul Scherrer Institute, Aristotle University of Thessaloniki, Joint Institute for Nuclear Research, Bhabha Atomic Research Center, Institute of Physics and Power Engineering (IPPE), Los Alamos National Laboratory, Tokyo Institute of Technology (TIT), University of York, University of Ioannina, University of Bologna, Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, Università degli Studi di Catania, University of Hertfordshire, Universität Basel, Uppsala University, Japan Atomic Energy Agency, Universidade de Lisboa, Australian National University

Journal

Physical Review C

Volume

91

No. of pages

11

ISSN

0556-2813

DOI

https://doi.org/10.1103/PhysRevC.91.024602

Publication date

02-2015

Peer reviewed

Yes

Austrian Fields of Science 2012

103014 Nuclear physics

Keywords

ASJC Scopus subject areas

Nuclear and High Energy Physics

Portal url

https://ucris.univie.ac.at/portal/en/publications/highaccuracy-determination-of-the-u-238--u-235-fission-cross-section-ratio-up-to-1-gev-at-ntof-at-cern(dec83dd9-deb3-4677-9897-9325d7c04ce1).html