The Radiative Capture Yield of Thorium-232 from 100 to 4000 eV

The neutron capture yield in two ²³²Th samples (0.0008 and 0.0027 atom/b, respectively) was measured with the Oak Ridge Electron Linear Accelerator time-of-flight facility over incident neutron energies from 100 to 4000 eV. A detailed comparison of the measured capture yields with calculations based on ENDF/B-V resonance parameters suggests that above 500 eV the evaluation needs additional work; in particular, the average capture appears systematically underestimated.