Measurement of the neutron induced fission cross section on transuranic (TRU) elements at the n_TOF facility at CERN

During the 2004 campaign, the n_TOF collaboration measured neutron fission cross sections for U-233, Am-241,Am-243, Cm-245, as well as the fission standards U-235.238, using a sealed Fission Ionization Chamber (FIC). The setup included a total of 16 targets and 18 electrodes mounted together in a 50-cm length chamber, allowing the measurements of all isotopes at the same time, thus in the same experimental conditions. A brief description of the facility and of the detector setup will be presented followed by the preliminary results of the analysis of U-235, U-233,; (CM)-C-245 from thermal energies up to some tenths of MeV