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Title	Laser-assisted decay spectroscopy for the ground states of $^{180,182}$Au
Related title	Laser-assisted decay spectroscopy for the ground states of Au180,182
Author(s)	Harding, R D (CERN ; York U., England) ; Andreyev, A N (York U., England ; JAERI, Tokai) ; Barzakh, A E (St. Petersburg, INP) ; Atanasov, D (Heidelberg, Max Planck Inst.) ; Cubiss, J G (York U., England) ; Van Duppen, P (Leuven U.) ; Al Monthery, M (York U., England) ; Althubiti, N A (Manchester U.) ; Andel, B (Leuven U. ; Comenius U.) ; Antalic, S (Comenius U.) ; Blaum, K (Heidelberg, Max Planck Inst.) ; Cocolios, T E (Leuven U. ; Manchester 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 (CERN ; Heidelberg, Max Planck Inst.) ; Gaffney, L P (CERN ; Liverpool U.) ; Ghys, L (Leuven U.) ; Joss, D T (Liverpool U.) ; Herfurth, F (Darmstadt, GSI) ; Huyse, M (Leuven U.) ; Imai, N (Tokyo U., CNS) ; Kreim, S (CERN ; Heidelberg, Max Planck Inst.) ; Lunney, D (CSNSM, Orsay) ; Lynch, K M (CERN ; Manchester U.) ; Manea, V (Heidelberg, Max Planck Inst.) ; Marsh, B A (CERN) ; Martinez Palenzuela, Y (CERN ; Leuven U.) ; Molkanov, P L (St. Petersburg, INP) ; Neidherr, D (Darmstadt, GSI) ; Page, R D (Liverpool U.) ; Pastore, A (New York U.) ; Rosenbusch, M (Greifswald U.) ; Rossel, R E (CERN ; Mainz U., Inst. Phys.) ; Rothe, S (CERN ; Mainz U., Inst. Phys.) ; 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 ; Darmstadt, Tech. U. ; Greifswald U.) ; Wolf, R N (Heidelberg, Max Planck Inst. ; Greifswald U.) ; Zuber, K (Dresden, Tech. U.)
Publication	2020
Number of pages	16
In:	Phys. Rev. C 102 (2020) 024312
DOI	10.1103/PhysRevC.102.024312
Subject category	Nuclear Physics - Experiment
Accelerator/Facility, Experiment	CERN ISOLDE
Abstract	A study of the ground states of the laser-ionized and mass-separated odd-odd isotopes $^{180,182}$Au was performed using the Resonance Ionization Laser Ion Source, Windmill detection setup and ISOLTRAP Multi-Reflection Time-of-Flight Mass Spectrometer at ISOLDE, CERN. A complex fine-structure α-decay pattern of $^{180}$Au was deduced, providing insight into the low-lying levels in the daughter nucleus $^{176}Ir$. An $α$-decay branching ratio of $b_α$($^{180}$Au)=0.58(10)% and a half-life of $T_{1/2}=7.2(5)$s have also been derived, allowing for the calculation of the reduced α-decay widths and determining the degree of hindrance of respective $α$-decay branches. From complementary first in-source laser spectroscopy measurements of the hyperfine structure in atomic transitions of $^{180,182}$Au, the nuclear magnetic moments of $μ$($^{180}$Au)=−0.83(9)$μ_N$ and $μ$($^{182}$Au)=1.66(9)$μ_N$ were extracted with an inclusion of a correction for the hyperfine anomaly. Based on the observed hyperfine structure patterns, and on the comparison of the measured and calculated $μ$ values, a preferred ground-state spin and parity $I^π(^{180}\textrm{Au}^{gs}=(1^+)$ is proposed, and the earlier assignment of $I^π(^{180}\textrm{Au}^{gs}=(2^+)$ is confirmed. For $^{182}$Au, the most probable proton-neutron Nilsson configuration of $π3/2^−[532]⊗ν5/2^−[512]$ suggests the same proton state as in the heavier deformed odd-odd nuclei $^{180,184}$Au.
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