Measurement of fast neutron induced fission cross section of minor-actinide

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In fuel cycles with recycled actinide, core characteristics are largely influenced by minor actinide (MA:Np, Am, Cm). Accurate nuclear data of MA such as fission cross section are required to estimate the effect of MA wich high accuracy. In this study, fast neutron induced fission cross section of MA is measured using Dynamitron accelerator in Tohoku University, The followings were performed in this fiscal year; (1)Research of nuclear data of MA, (2)Sample preparation and sample mass assay, (3)Investigation of neutron sources with the energy of several 10 keV, (4)Preliminary measurement of fission cross section using Dynamitron accelerator. As the result, four Np samples were prepared and the sample mass were measured using alpha-spectrometry with the accuracy of 1.2%. Then, it was confirmed that a neutron source via Li(p, n) Be reaction using a Li-thick target is suitable for measuring fission cross section of MA in the energy region of several 10 keV. Furthermore, it was verified by the preliminary measurement that the measurement of fission cross section of MA is available using a fission chamber and electronics developed in this study.