FISSION CROSS-SECTION MEASUREMENTS OF CM-247, ES-254, AND CF-250 FROM 0.1 EV TO 80 KEV

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