Measurements of the 0.099-eV resonance in Sm-149 have been made with a crystal spectrometer and a neutron velocity selector in the energy range from 0.0006 to 1 eV. Samples highly enriched to 97.42% in Sm-149 were used. The observed neutron transmissions were analysed by a shape method using a Breit-Wigner singlelevel formula. The resonance parameters obtained from the analysis are; E 0 =0.0989±0.008 eV, \({=}59.5{±}0.8\) MeV, and \({ₙ}⁰{=}1.71{±}0.03\) MeV, assuming the statistical weight factor is 9/16. The 2200 m/sec value of the total cross section is 37,000±,600 barns.
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Asami et al. (1969) studied this question.
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