By observations of the transmission of ${\mathrm{H}}_2$O and ${\mathrm{D}}_2$O for neutrons of discrete energies between 0.35 and 6.0 Mev and from a knowledge of ${\sigma }_s{\left(\mathrm{H}\right)}^1$, values of ${\sigma }_s\left(\mathrm{D}\right)$ and ${\sigma }_s\left(\mathrm{O}\right)$ are deduced as a function of neutron energy. ${\sigma }_s\left(\mathrm{D}\right)$ is a monotonic function of neutron energy in this region but ${\sigma }_s\left(\mathrm{O}\right)$ shows evidence for resonance phenomena.

• Received 20 September 1946

DOI:https://doi.org/10.1103/PhysRev.70.805