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The $^{238}$U to $^{235}$U fission cross section ratio has been determined atn_TOF up to $\sim$1 GeV, with two different detection systems, in differentgeometrical configurations. A total of four datasets have been collected andcompared. They are all consistent to each other within the relative systematicuncertainty of 3-4%. The data collected at n_TOF have been suitably combined toyield 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 alsoobserved with theoretical calculations based on the INCL++/Gemini++ combinationup to the highest measured energy. The n_TOF results may help solving along-standing discrepancy between the two most important experimental datasetavailable so far above 20 MeV, while extending the neutron energy range for thefirst time up to $\sim$1 GeV.

High accuracy determination of the $^{238}$U/$^{235}$U fission cross section ratio up to $\sim$1 GeV at n_TOF (CERN)