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MPINP:
Präzisionsexperimente - Abteilung Blaum
Abstract:
A study of the laser-ionized and mass-separated neutron-deficient
isotopes Au-176,Au-177,Au-179 was performed using the Resonance
Ionization Laser Ion Source and the Windmill detection setup at ISOLDE,
CERN. New and improved data on complex fine-structure alpha decays of
the three isotopes were deduced, providing insight into the low-lying
levels in the daughter nuclei Ir-172,Ir-173,Ir-175. New information on
the properties of beta-decay daughter products Pt-177,Pt-179 was also
obtained. From the first in-source laser spectroscopy measurements of
the hyperfine structure in the atomic 267.6-nm transition of Au-176, the
nuclear magnetic moments for both high- and low-spin alpha-decaying
states were deduced. Together with the values determined from the
additivity relations, they were used to propose the most probable spins
and configurations for both states. The a-decay branching ratios were
determined as b(alpha)(Au-176(1s)) = 58(5)% and b(alpha)(Au-176(hs)) =
29 (5)%.
