Neutron Capture in the Separated Isotopes of Platinum

Abstract

Using the separated isotopes of platinum, irradiated in the pile, the energies of the gamma rays for the activities of ${\mathrm{Pt}}^{191}$, ${\mathrm{Pt}}^{193}$, and ${\mathrm{Pt}}^{195}$ have been evaluated. For ${\mathrm{Pt}}^{191}$ fifteen gamma rays are found which fit well a simple level scheme. ${\mathrm{Pt}}^{193}$ emits isomerically a gamma ray followed by $K$ capture to iridium, with the possible emission of a high-energy gamma. ${\mathrm{Pt}}^{195}$ emits a highly converted gamma ray followed by two others in rapid succession decaying to the stable isotope. The half-lives of the three activities are found to be 2.90, 3.35, and 6 days, respectively.