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Journal Article

229mTh isomer from a nuclear model perspective


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;


Pálffy,  Adriana
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;
Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany;

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Minkov, N., & Pálffy, A. (2021). 229mTh isomer from a nuclear model perspective. Physical Review C, 103(1): 014313. doi:10.1103/PhysRevC.103.014313.

Cite as: https://hdl.handle.net/21.11116/0000-0008-0C56-B
The physical conditions for the emergence of the extremely low-lying nuclear
isomer 229mTh at approximately 8 eV are investigated in the framework of
our recently proposed nuclear structure model. Our theoretical approach
explains the 229mTh-isomer phenomenon as the result of a very fine
interplay between collective quadrupole-octupole and single-particle dynamics
in the nucleus. We find that the isomeric state can only appear in a rather
limited model space of quadrupole-octupole deformations in the single-particle
potential, with the octupole deformation being of a crucial importance for its
formation. Within this deformation space the model-described quantities exhibit
a rather smooth behaviour close to the line of isomer-ground state
quasi-degeneracy determined by the crossing of the corresponding
single-particle orbitals. Our comprehensive analysis confirms the previous
model predictions for reduced transition probabilities and the isomer magnetic
moment, while showing a possibility for limited variation in the ground-state
magnetic moment theoretical value. These findings prove the reliability of the
model and suggest that the same dynamical mechanism could manifest in other
actinide nuclei giving a general prescription for the search and exploration of
similar isomer phenomena.