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. 2018 Mar 2;120(9):093001.
doi: 10.1103/PhysRevLett.120.093001.

New Nuclear Magnetic Moment of ^{209}Bi: Resolving the Bismuth Hyperfine Puzzle

Leonid V Skripnikov  1   2 , Stefan Schmidt  3   4 , Johannes Ullmann  3   5 , Christopher Geppert  6 , Florian Kraus  7 , Benjamin Kresse  8 , Wilfried Nörtershäuser  3 , Alexei F Privalov  8 , Benjamin Scheibe  7 , Vladimir M Shabaev  1 , Michael Vogel  8 , Andrey V Volotka  1   9
Affiliations

New Nuclear Magnetic Moment of ^{209}Bi: Resolving the Bismuth Hyperfine Puzzle

Leonid V Skripnikov et al. Phys Rev Lett. .

Abstract

A recent measurement of the hyperfine splitting in the ground state of Li-like ^{208}Bi^{80+} has established a "hyperfine puzzle"-the experimental result exhibits a 7σ deviation from the theoretical prediction [J. Ullmann et al., Nat. Commun. 8, 15484 (2017)NCAOBW2041-172310.1038/ncomms15484; J. P. Karr, Nat. Phys. 13, 533 (2017)NPAHAX1745-247310.1038/nphys4159]. We provide evidence that the discrepancy is caused by an inaccurate value of the tabulated nuclear magnetic moment (μ_{I}) of ^{209}Bi. We perform relativistic density functional theory and relativistic coupled cluster calculations of the shielding constant that should be used to extract the value of μ_{I}(^{209}Bi) and combine it with nuclear magnetic resonance measurements of Bi(NO_{3})_{3} in nitric acid solutions and of the hexafluoridobismuthate(V) BiF_{6}^{-} ion in acetonitrile. The result clearly reveals that μ_{I}(^{209}Bi) is much smaller than the tabulated value used previously. Applying the new magnetic moment shifts the theoretical prediction into agreement with experiment and resolves the hyperfine puzzle.

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