Abstract
On-line resonance ionization mass spectrometry has been applied to determine the isotope shift and hyperfine structure of185–189Au and tne I=11/2 isomer of189Au in the 6s2S1/2 → 6p2P1/2λ=268 nm) transition. The Au atoms were obtained as daughters of mass-separated Hg isotopes produced at the ISOLDE facility at CERN, ionized by a three-step resonant photoionization process, detected and mass-selected by time of flight. A drastic change of the nuclear charge radius was observed between187Au and186Au, which is interpreted as an onset of strong deformation of β2 ≈ 0.25 in186Au and185Au.
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This work has been supported by the Bundesministerium für Forschung und Technologie. One of us, J. Wood was supported in part by the U.S. Department of Energy, Contract DE-AS05-80 ER 10599.
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Wallmeroth, K., Bollen, G., Borge, M.J.G. et al. Nuclear shape transition in neutron-deficient gold isotopes. Hyperfine Interact 34, 21–24 (1987). https://doi.org/10.1007/BF02072675
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DOI: https://doi.org/10.1007/BF02072675