High accuracy determination of the $^{238}$U/$^{235}$U fission cross section ratio up to $\sim$1 GeV at n_TOF (CERN)
Creators: name: Paradela, C.
name: Calviani, M.
name: Tarrío, D.
name: Leal-Cidoncha, E.
name: Leong, L. S.
name: Tassan-Got, L.
name: Naour, C. Le
name: Duran, I.
name: Colonna, N.
name: Audouin, L.
name: Mastromarco, M.
name: Meo, S. Lo
name: Ventura, A.
name: Altstadt, S.
name: Andrzejewski, J.
name: Barbagallo, M.
name: Bécares, V.
name: Bečvář, F.
name: Belloni, F.
name: Berthoumieux, E.
name: Billowes, J.
name: Boccone, V.
name: Bosnar, D.
name: Brugger, M.
name: Calviño, F.
name: Cano-Ott, D.
name: Carrapiço, C.
name: Cerutti, F.
name: Chiaveri, E.
name: Chin, M.
name: Cortés, G.
name: Cortés-Giraldo, M. A.
name: Cosentino, L.
name: Diakaki, M.
name: Domingo-Pardo, C.
name: Dressler, R.
name: Eleftheriadis, C.
name: Ferrari, A.
name: Finocchiaro, P.
name: Fraval, K.
name: Ganesan, S.
name: García, A. R.
name: Giubrone, G.
name: Gómez-Hornillos, M. B.
name: Gonçalves, I. F.
name: González-Romero, E.
name: Griesmayer, E.
name: Guerrero, C.
name: Gunsing, F.
name: Gurusamy, P.
name: Heinitz, S.
name: Jenkins, D. G.
name: Jericha, E.
name: Käppeler, F.
name: Karadimos, D.
name: Kivel, N.
name: Kokkoris, M.
name: Krtička, M.
name: Kroll, J.
name: Langer, C.
name: Lederer, C.
name: Leeb, H.
name: Losito, R.
name: Manousos, A.
name: Marganiec, J.
name: Martínez, T.
name: Massimi, C.
name: Mastinu, P.
name: Mendoza, E.
name: Mengoni, A.
name: Milazzo, P. M.
name: Mingrone, F.
name: Mirea, M.
name: Mondalaers, W.
name: Musumarra, A.
name: Pavlik, A.
name: Perkowski, J.
name: Plompen, A.
name: Praena, J.
name: Quesada, J.
name: Rauscher, T.
name: Reifarth, R.
name: Riego, A.
name: Roman, F.
name: Rubbia, C.
name: Sarmento, R.
name: Saxena, A.
name: Schillebeeckx, P.
name: Schmidt, S.
name: Schumann, D.
name: Tagliente, G.
name: Tain, J. L.
name: Tsinganis, A.
name: Valenta, S.
name: Vannini, G.
name: Variale, V.
name: Vaz, P.
name: Versaci, R.
name: Vermeulen, M. J.
name: Vlachoudis, V.
name: Vlastou, R.
name: Wallner, A.
name: Ware, T.
name: Weigand, M.
name: Weiß, C.
name: Wright, T.
name: Žugec, P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The $^{238}$U to $^{235}$U fission cross section ratio has been determined at n_TOF up to $\sim$1 GeV, with two different detection systems, in different geometrical configurations. A total of four datasets have 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 the neutron energy. The result confirms current evaluations up to 200 MeV. A 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 solving a long-standing discrepancy between the two most important experimental dataset available so far above 20 MeV, while extending the neutron energy range for the first time up to $\sim$1 GeV.