Results are presented of high-resolution transmission measurements using pure natural K metal samples. The measured total σ vs E to 400 keV is given, and resonance parameter evaluations are given for 65 resonances below 200 keV. The isosopte assignments, $A=39 or 41$, are mainly based on recent unpublished measurements of Good and Harvey at the Oak Ridge electron linear accelerator using separated K isotope samples. Values of level strengths, agΓₙ, are mainly based on transmission dip area analysis, which with evidence from the resonance shape and peak cross sections permits assignment of l and J for most resonances, and A for many of the resonances not identified in the separated isotope measurements. We obtain for the s and p strength functions: 10⁴S₀=(0.66_-0.30+0.63),(0.78_-0.41+1.08), and 10⁴S₁=(1.8_-0.5+0.7) and (2.4_-0.8+1.3) for ³⁹K and ⁴¹K, respectively.
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Singh et al. (1973) studied this question.
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