Neutron Resonances in the Rare Earth Elements

Abstract

The neutron cross sections of the fifteen rare earth elements (excepting ${}_{61}{}^{}{}_{}{}^{}\mathrm{Pm}$) have been measured in the energy range from 0.07 to ∼20 ev with a crystal spectrometer. The resonances found are summarized in a table giving the resonant energies, $E_0$, and a qualitative value of the strength, ${\sigma }_0{\Gamma }^2$. For some cases, the isotope responsible for the resonance has been identified and is also listed.