Fission Cross-Section Measurements of247Cm,254Es, and250Cf from 0.1 eV to 80 keV

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Abstract
The fission cross sections of 247Cm, 254Es, and 250Cf are measured with the Rensselaer intense neutron spectrometer from 0.1 eV to 80 keV. The cross sections are normalized to the 235U ENDF/B-V broadened cross section. Fission areas and resonance widths are determined for low-energy resonances in 247Cm. The 254Es and 250Cf fission cross sections are the only reported measurements for these isotopes. The 254Es isotope is the heaviest odd-odd isotope ever measured over this energy range. The thermal fission cross sections for 247Cm, 254Es, and 250Cf are determined by extrapolation of the low-energy region of the cross section and are in good agreement with other reported measurements. Resonance integrals are reported for the energy range of 0.1 eV to 80 keV, and the areas for 247Cm and 250Cf resonances are also reported. The previously reported 246Cm fission cross section was corrected for fission in 247Cm.