Measurement of fast neutron induced fission cross section of Americium isotopes

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In a fuel cycle with recycled actinide, americium isotopes largely influence core characteristics for a fast reactor. Accurate nuclear data for americium isotopes such as fission cross section are required to estimate effect of those isotopes on a fast reactor core. Nevertheless, experimental data for those isotopes are not enough to evaluate them accurately at the present time. Under these circumstances, fast neutron induced fission cross sections of those isotopes have been measured using Dynamitron Accelerator of Tohoku University. In the present study, fission cross section ratios of Am241/Np237 and Am243/Np237 were measured at 4.0 MeV and 6.3 MeV using the improved tools and samples, which have previously developed in this study, The measured results for the fission cross sections of Am241 and Am243 at the two energy points did not agree with those in a nuclear data library, and different nuclear data libraries werc supported by the present results dependent on energy and isotope.