Abstract
The nuclear inelastic scattering cross section of 232Th has been measured at 144 keV using a Si-filtered neutron beam from the University of Missouri Research Reactor (MURR). The energy spectrum of the scattered neutrons was measured with a spherical hydrogen-gas counter and a pulse-height-unfolding procedure. Data were taken at nine scattering angles from 30° to 150° in 15° increments. The results provide new experimental information below 250 keV. The angle-integrated cross section is 0.74±0.05 barn, which agrees with the evaluation JENDL-2 and with a coupled-channel calculation where the inelastic scattering through the direct-excitation process of the collective rotational motion of a deformed nucleus is included as well as that through the compound-nucleus-formation process. Experimental results have been obtained also for the angular dependence of the elastically scattered neutrons at 144 keV.
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