Spins of resonances in reactions of neutrons with ${}^{238}$U and ${}^{113}$Cd

In this paper experiments are described that have led to the assignment of spins of a large number of $s$- and $p$-wave resonances in reactions of epithermal neutrons with the nuclei ${}^{238}$U and ${}^{113}$Cd. The gamma-ray spectra of the $(n,\gamma )$ reactions have been measured using the time-of-flight technique at the GELINA pulsed neutron source facility. For the present spin determinations we have exploited the fact that the population through gamma radiation of low-lying nuclear states from the compound nucleus is dependent on the resonance spin. These assignments are important for the analysis of measurements of parity nonconservation in compound nuclei.