Neutron resonance spectroscopy. XIV. Potassium

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 The isosopte assignments, A=39 or 41, are mainly based on recent unpublished measurements of Good and Harvey at the Oak Ridge electron linear accelerator using separated K isotope samples.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, $ag{\Gamma }_n$, 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: ${10}^4{S}_0=\left({0.66}_{-0.30}^{+0.63}\right),\left({0.78}_{-0.41}^{+1.08}\right)$, and 10^4S_1=(1.8_-0.5^+0.7) and (2.4_-0.8^+1.3) for ³⁹K and ⁴¹K, respectively.