Decay ofPt197

Abstract

The decay of ${}_{78}{}^{}{}_{}{}^{}\mathrm{Pt}_{}^{197}{}_{}{}^{}$ (20 h) to ${}_{79}{}^{}{}_{}{}^{}\mathrm{Au}_{}^{197}{}_{}{}^{}$ was studied by means of gamma-ray scintillation spectrometry. Three gamma-ray transitions of 77, 191, and 269 keV exist. The energy of the third transition was found to be (269.2±0.5) keV, instead of the previously reported value of 279 keV. A new decay scheme is proposed with only two excited states, at 77 and 269 keV. The possible effects of these results on the interpretation of measurements of the Coulomb excitation of ${\mathrm{Au}}^{197}$ and of the decay of ${\mathrm{Hg}}^{197}$ are discussed.