The Parameters of the 0.099-eV Neutron Resonance in Sm-149

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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.<BR>The resonance parameters obtained from the analysis are; E0=0.0989±0.0008 eV, Γ=59.5±0.8 MeV, and Γn0=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±1,600 barns.

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