-Decay branching ratios measured by -ray tagging

Abstract: The nuclides 168–170Pt were produced by bombarding isotopically enriched 92,94Mo targets with 336, 348MeV 78Kr ions. Prompt rays were detected at the target position and provided a selection criterion for the 168–170Pt nuclei. This technique enables the problem of the background from higher-energy decays in the spectrum to be circumvented. The Pt nuclei were separated in flight using the gas-filled separator RITU and implanted into the GREAT spectrometer, which was used to study subsequent decays. The -decay branching ratios of 164–166Os were deduced from the fraction of selected 168–170Pt nuclei correlated with decays of 164–166Os. The resulting branching ratios agree with the literature values but can have improved precision. [Copyright &y& Elsevier]