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

C. Paradela, M. Calviani, D. Tarrío, 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. Álvarez, F. Álvarez-Velarde, S. Andriamonje, J. Andrzejewski, G. BadurekM. Barbagallo, P. Baumann, V. Bécares, F. Bečvář, F. Belloni, B. Berthier, E. Berthoumieux, J. Billowes, V. Boccone, D. Bosnar, M. Brugger, F. Calviño, D. Cano-Ott, R. Capote, C. Carrapiço, P. Cennini, F. Cerutti, E. Chiaveri, M. Chin, G. Cortés, M. A. Cortés-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. García, G. Giubrone, M. B. Gómez-Hornillos, I. F. Gonçalves, E. González-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. Käppeler, D. Karadimos, D. Karamanis, M. Kerveno, V. Ketlerov, N. Kivel, M. Kokkoris, V. Konovalov, M. Krtička, J. Kroll, C. Lampoudis, C. Langer, C. Lederer, H. Leeb, R. Losito, M. Lozano, A. Manousos, J. Marganiec, T. Martínez, 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. Žugec

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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.

Original languageEnglish
Article number024602
Number of pages11
JournalPhysical Review C (nuclear physics)
Issue number2
Publication statusPublished - 9 Feb 2015


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