Results are presented of measurements of the total cross section vs energy which was measured to 320 keV for pure metallic sodium. R-matrix fits were made to the seven prominent observed resonances. The best-fit parameters for (E₀,Γ,J,l) for each resonance are: (2.850, 0.400, 1, 0); (53.15, 1.08, 2, 1); (199.0, 4.5, 1, 0); (212.5, 15, 0, 1); (238, 3.9, 2, 1); (242, 3.5, 0, 1); (297, 1.8, 2, 0), where E₀ and Γ are in keV. Three levels are assigned to be s levels, and four to be p levels. This gives 10⁴S₀=0.24(1_-0.58+1.91) and 10⁴S₁=2.06(1_-0.39+0.77). The S₁ evaluation includes the presence of weak p levels seen in capture measurements by others.
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Rahn et al. (1973) studied this question.
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