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Title	Shape coexistence in $^{187}$Au studied by laser spectroscopy
Author(s)	Barzakh, A E (St. Petersburg, INP) ; Atanasov, D (Heidelberg, Max Planck Inst.) ; Andreyev, A N (York U., England ; JAERI, Tokai) ; Monthery, M Al (York U., England) ; Althubiti, N A (Manchester U. ; Al Jouf U.) ; Andel, B (Leuven U. ; Comenius U.) ; Antalic, S (Comenius U.) ; Blaum, K (Heidelberg, Max Planck Inst.) ; Cocolios, T E ; Cubiss, J G ; Van Duppen, P (Leuven U.) ; Day Goodacre, T (CERN ; Manchester U.) ; de Roubin, A (Heidelberg, Max Planck Inst.) ; Farooq-Smith, G J (Leuven U. ; Manchester U.) ; Fedorov, D V (St. Petersburg, INP) ; Fedosseev, V N (CERN) ; Fink, D A (Heidelberg, Max Planck Inst. ; CERN) ; Gaffney, L P (CERN ; Liverpool U.) ; Ghys, L (Leuven U. ; SCK-CEN, Mol) ; Harding, R D (CERN ; York U., England) ; Huyse, M (Leuven U.) ; Imai, N (Tokyo U., CNS) ; Kreim, S (Heidelberg, Max Planck Inst. ; CERN) ; Lunney, D (CSNSM, Orsay) ; Lynch, K M (CERN ; Manchester U.) ; Manea, V (Heidelberg, Max Planck Inst.) ; Marsh, B A (CERN) ; Palenzuela, Y Martinez ; Molkanov, P L (St. Petersburg, INP) ; Neidherr, D (Darmstadt, GSI) ; Rosenbusch, M (Greifswald U.) ; Rossel, R E (CERN ; Mainz U.) ; Rothe, S (CERN ; Mainz U.) ; Schweikhard, L (Greifswald U.) ; Seliverstov, M D (St. Petersburg, INP) ; Sels, S (Leuven U.) ; Van Beveren, C (Leuven U.) ; Verstraelen, E (Leuven U.) ; Welker, A (CERN ; Dresden, Tech. U.) ; Wienholtz, F (CERN ; Greifswald U.) ; Wolf, R N (Heidelberg, Max Planck Inst. ; Greifswald U.) ; Zuber, K (Dresden, Tech. U.)
Publication	2020
Number of pages	7
In:	Phys. Rev. C 101 (2020) 064321
DOI	10.1103/PhysRevC.101.064321
Subject category	Nuclear Physics - Experiment
Abstract	Hyperfine-structure parameters and isotope shift of the 9/2$^−$ isomeric state in $^{187}$Au relative to $^{197}$Au for the 267.6-nm atomic transition have been measured for the first time using the in-source resonance-ionization spectroscopy technique. The magnetic dipole moment and change in the mean-square charge radius for this 9/2$^−$ isomer have been deduced. The observed large isomer shift relative to the 1/2$^+$ ground state in $^{187}$Au confirms the occurrence of the shape coexistence in $^{187}$Au proposed earlier from the analysis of the nuclear spectroscopic data and particle plus triaxial rotor calculations. The analysis of the magnetic moment supports the previously proposed 9/2$^−$, 1/2$^−$[541] assignment at moderate prolate deformation for $^{187}$Au$^m$.
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