Abstract
By using the linac time-of-flight method, neutron transmission spectra through metallic Th samples were measured with a 6Li glass scintillator placed at the 22 m station. Least-squares shape analysis using the SIOB code was employed to obtain the neutron and capture widths for the 21 s-wave resonances for 232Th in the lower energy region. The results differed from old measurements and satisfactorily agreed with the recent measurements made by Olsen and Chrien. In order to make an integral check of the resonance parameters, the resonance integral for the 232Th(n, γ) reaction has been calculated by using the parameters measured above, and by using the evaluated parameters in JENDL-2, ENDF/B-IV and -V, and these calculated results have been compared with the measurement made in a standard 1 E spectrum field. The calculation has also been performed by exchanging the parameters in the evaluated data files for those presently measured. Resonance parameters in JENDL-2 have been found to be smaller than those measured, especially for the first two s-wave resonances.
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