Fission Cross-Section Measurements of ²⁴⁷Cm, ²⁵⁴Es, and ²⁵⁰Cf from 0.1 eV to 80 keV

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.