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In order to check the conceptual design of the subcritical blanket in a fusion-fission hybrid reactor, a depleted uranium/polyethylene simulation device with alternate shells has been established. The measurement of the 238 U(n, 2n) reaction rate was carried out using an activation technique, by measuring the 208 keV γ rays emitted from 237 U. The self-absorption of depleted uranium foils with different thicknesses was experimentally corrected. The distribution of the 238 U(n, 2n) reaction rate at 90 to the incident D + beam was obtained, with uncertainty between 5.3% and 6.0%. The experiment was analyzed using MCNP5 code with the ENDF/BVI library, and the calculated results are all about 5% higher than the measured results.
In order to check the conceptual design of the subcritical blanket in a fusion-fission hybrid reactor, a depleted uranium / polyethylene simulation device with alternate shells has been established. The measurement of the 238 U (n, 2n) reaction rate was carried out using an activation technique, measured by 208 keV γ rays emitted from 237 U. The self-absorption of depleted uranium foils with different thicknesses was experimentally corrected. The distribution of the 238 U (n, 2n) reaction rate at 90 to the incident D + beam was obtained, with uncertainty between 5.3% and 6.0%. The experiment was analyzed using MCNP5 code with the ENDF / BVI library, and the calculated results are all about 5% higher than the measured results.