Low energy neutron resonance absorption and scattering integrals have been measured, and resonance scattering fractions, $\frac{{\Gamma }_n}{\Gamma }$, have been determined for about thirty elements. Lightweight $\mathrm{odd}Z-\mathrm{even}N$ and $\mathrm{even}Z-\mathrm{odd}N$ isotopes are shown to have similar resonance phenomena. Correlations of level density and scattering fraction with atomic weight and nuclear type are presented.

• Received 2 February 1950

DOI:https://doi.org/10.1103/PhysRev.79.11