Shape and electromagnetic properties of the 229mTh isomer

Minkov, Nikolay; Pálffy, Adriana

doi:10.1051/epjconf/202125202003

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Shape and electromagnetic properties of the ^229mTh isomer

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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;
Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany;

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引用

Minkov, N., & Pálffy, A. (2021). Shape and electromagnetic properties of the ^229mTh isomer. EPJ Web of Conferences, 252:. doi:10.1051/epjconf/202125202003.

引用: https://hdl.handle.net/21.11116/0000-0009-880E-F

要旨

We examine the physical conditions, and specifically the role of the quadrupole-octupole deformation, for the emergence of the 8 eV “clock” isomer ^229mTh. Our nuclear structure model suggests that such an extremely low-energy state can be the result of a very fine interplay between the shape and single-particle (s.p.) dynamics in the nucleus. We find that the isomer can only appear in a rather limited region of quadrupoleoctupole deformation space close to a line along which the ground-state and isomer s.p. orbitals 5/2[633] and 3/2[631], respectively, cross each other providing the isomer-formation quasi-degeneracy condition. The crucial role of the octupole deformation in the formation mechanism is pointed out. Our calculations within the outlined deformation region show a smooth behaviour of the ²²⁹Th electromagnetic properties, including the isomer decay rate, allowing for their more precise theoretical determination