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The normalized $^{238}$U(n,f)/$^{235}$U(n,f) cross section ratio has beenmeasured using the NIFFTE fission Time Projection Chamber from the reactionthreshold to $30$~MeV. The fissionTPC is a two-volume MICROMEGAS timeprojection chamber that allows for full three-dimensional reconstruction offission-fragment ionization profiles from neutron-induced fission. Themeasurement was performed at the Los Alamos Neutron Science Center, where theneutron energy is determined from neutron time-of-flight. The$^{238}$U(n,f)/$^{235}$U(n,f) ratio reported here is the first cross sectionmeasurement made with the fissionTPC, and will provide new experimental datafor evaluation of the $^{238}$U(n,f) cross section, an important standard usedin neutron-flux measurements. Use of a development target in this workprevented the determination of an absolute normalization, to be addressed infuture measurements. Instead, the measured cross section ratio has beennormalized to ENDF/B-VIII.$\beta$5 at 14.5 MeV.

Measurement of the normalized $^{238}$U(n,f)/$^{235}$U(n,f) cross section ratio from threshold to 30 MeV with the fission Time Projection Chamber