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Theoretical Predictions for the Magnetic Dipole Moment of 229mTh

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Minkov,  Nikolay
Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Tzarigrad Road 72, BG-1784 Sofia, Bulgaria;
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Pálffy,  Adriana
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Citation

Minkov, N., & Pálffy, A. (2019). Theoretical Predictions for the Magnetic Dipole Moment of 229mTh. Physical Review Letters, 122(16): 162502. doi:10.1103/PhysRevLett.122.162502.


Cite as: https://hdl.handle.net/21.11116/0000-0003-CBB1-0
Abstract
A recent laser spectroscopy experiment [J. Thielking et al., Nature (London)
556, 321 (2018)] has determined for the first time the magnetic dipole moment
of the 7.8 eV isomeric state $^{229m}$Th. The measured value differs by a
factor of approximately 5 from previous nuclear theory predictions based on the
Nilsson model, raising questions about our understanding of the underlying
nuclear structure. Here, we present a new theoretical prediction based on a
nuclear model with coupled collective quadrupole-octupole and single-particle
motions. Our calculations yield an isomer magnetic dipole moment of $\mu_{ IS}=
-0.35\mu_N$ in surprisingly good agreement with the experimentally determined
value of $-0.37(6)\mu_N$, while overestimating the ground state dipole moment
by a factor 1.4. The model provides further information on the states' parity
mixing, the role and strength of the Coriolis mixing and the most probable
value of the gyromagnetic ratio $g_R$ and its consequences for the transition
probability $B(M1)$.