Neutron capture cross sections of184,189,190,192Os and the decays of185Os,190Osm,191Os, and193Os

Abstract

Radiative neutron capture cross sections have been measured for the stable isotopes of natural Os with mass numbers 184, 189, 190, and 192 by observing radioactive decays of the activation products following neutron irradiation of naturally occurring Os. From irradiations of Os samples separately with thermal and epithermal neutrons, independent values of the thermal cross sections and resonance integrals have been deduced. By observing the $\ensuremath{\gamma}$ rays emitted by the activation products ${}^{185}$Os, ${}^{190}$Os${}^{m}$, ${}^{191}$Os, and ${}^{193}$Os, improved values for the energies and intensities of the $\ensuremath{\gamma}$ rays and the decay half-lives have been obtained, enabling corresponding improvements in the energy values and $\ensuremath{\beta}$-decay feedings of levels in the daughter nuclei.