The Thermal Neutron Capture Cross Sections and Resonance Integrals of ¹⁴⁴Sm and ¹⁴⁵Sm

Two-group integral neutron capture cross sections have been measured for ¹⁴⁴Sm and ¹⁴⁵Sm. Mass spectrographic assays were carried out on highly enriched samples of ¹⁴⁴Sm that were irradiated in a high-flux nuclear reactor making use of cadmium filters and cobalt as a flux monitor. Under the assumption that these nuclides have a (1/ν) dependence in the thermal region, the following are reported: for ¹⁴⁴Sm, σ^c₂₂₀₀ = 1.64 ± 0.10 and I^c = 2.38 ± 0.17 b; for ¹⁴⁵Sm, σ^c₂₂₀₀ = 280 ± 21 and I^c = 600 ± 90 b.