Fission Cross-Section Measurements of241Am between 0.1 eV and 10 keV with Lead Slowing-Down Spectrometer and at Thermal Neutron Energy

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Abstract
Making use of back-to-back type double fission chambers and a lead slowing-down spectrometer coupled to an electron linear accelerator, the cross section for the 241Am(n,f) reaction has been measured relative to that for the 235U(n,f) reaction in the energy range from 0.1 eV to 10 keV. To avoid the interference between the 241 Am and the 235U resonances, the fission cross section below 1 keV was measured relative to the 10B(n, α) reaction with a BF3 counter, and the result obtained was normalized to the absolute value by the 235U reference data between 200 eV and 1 keV The measured result has been compared with (a) the evaluated nuclear data contained in the ENDF/B-VI and JENDL-3.2 libraries and (b) the existing experimental data, with the evaluated and measured data being broadened using the energy resolution function of the spectrometer.There is general agreement between the evaluated data and this measurement, although some discrepancies are found in the energy region where the cross-section sh...

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