alpha-Decay branching ratios measured by gamma-ray tagging

• The nuclides Pt168-170 were produced by bombarding isotopically enriched Mo-92,Mo-94 targets with 336, 348 MeV Kr-78 ions. Prompt gamma rays were detected at the target position and provided a selection criterion for the Pt168-170 nuclei. This technique enables the problem of the background from higher-energy alpha 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 alpha decays. The alpha-decay branching ratios of Os164-166 were deduced from the fraction of selected Pt168-170 nuclei correlated with a decays Of Os164-166. The resulting branching ratios agree with the literature values but can have improved precision.

Nyckelord

Nuclear reactions Kr-78+Mo-92,Mo-94 at 336

348 MeV beam energy

Enriched targets

Gas-filled recoil separator

Si detectors

Measured

alpha-decay branching ratio

Reduced alpha width

neutron-deficient isotopes

total data readout

excited-states

identification

nuclei

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