Abstract
A study of the laser-ionized and mass-separated neutron-deficient isotopes Au 176 , 177 , 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 α decays of the three isotopes were deduced, providing insight into the low-lying levels in the daughter nuclei Ir 172 , 173 , 175 . New information on the properties of β -decay daughter products Pt 177 , 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 α -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 α -decay branching ratios were determined as b α ( Au ls 176 ) = 58 ( 5 ) % and b α ( Au hs 176 ) = 29 ( 5 ) % .
Highlights
IntroductionThe present investigation is a part of an extended experimental campaign performed by our collaboration at the ISOLDE facility [20] at CERN to study the charge radii and decay properties in the gold isotopic chain
The neutron-deficient nuclei around the closed proton shell at Z = 82 and neutron midshell at N = 104 exhibit some of the best examples of shape coexistence at low energy [1,2]
The present investigation is a part of an extended experimental campaign performed by our collaboration at the ISOLDE facility [20] at CERN to study the charge radii and decay properties in the gold isotopic chain
Summary
The present investigation is a part of an extended experimental campaign performed by our collaboration at the ISOLDE facility [20] at CERN to study the charge radii and decay properties in the gold isotopic chain. These experiments use the unique capabilities to produce intense and purified beams of short-lived isotopes, provided by the combination of resonant laser ionization and mass separation at ISOLDE. This method often allows us to study weak decay branches unattainable in previous experiments. The first results from these studies, mostly with an emphasis on the laser spectroscopy of the
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