Sudden change in the nuclear charge distribution of very light gold isotopes

K. Wallmeroth; G. Bollen; A. Dohn; P. Egelhof; J. Grüner; F. Lindenlauf; U. Krönert; J. Campos; A. Rodriguez Yunta; M. J. G. Borge; A. Venugopalan; J. L. Wood; R. B. Moore; H. -J. Kluge

doi:10.1103/PhysRevLett.58.1516

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Sudden change in the nuclear charge distribution of very light gold isotopes

K. Wallmeroth, G. Bollen, A. Dohn, P. Egelhof, J. Grüner, F. Lindenlauf, and U. Krönert

J. Campos and A. Rodriguez Yunta

M. J. G. Borge and A. Venugopalan

J. L. Wood

R. B. Moore

H. -J. Kluge

Institut für Physik, Universitat Mainz, D-6500 Mainz, Federal Republic of Germany

Universidad Complutense and Junta de Energía Nuclear, Madrid, Spain

ISOLDE Collaboration, European Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland

School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332

McGill University, Montreal, Canada H3A 2B2

Institut für Physik, Universität Mainz, D-6500 Mainz, Federal Republic of Germany and ISOLDE Collaboration, European Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland

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Phys. Rev. Lett. 58, 1516 – Published 13 April, 1987

DOI: https://doi.org/10.1103/PhysRevLett.58.1516

Abstract

On-line resonance-ionization mass spectrometry has been applied to determine the isotope shift and hyperfine structure of ${}^{185 - 189}{Au}$ and ${}^{189 m}{Au}$ in the 6s $^{2}$ $S_{1 / 2}$ →6p $^{2 p}$ $_{1 / 2}$ (λ=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-color, two-step resonant photoionization process, detected and mass-selected by time of flight. A drastic change of the nuclear charge radius was observed between ${}^{187}{Au}$ and ${}^{186}{Au}$ , which is interpreted as an onset of strong deformation of β≊0.25 in ${}^{186}{Au}$ and ${}^{185}{Au}$ .

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Sudden change in the nuclear charge distribution of very light gold isotopes

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