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  Shape and electromagnetic properties of the 229mTh isomer

Minkov, N., & Pálffy, A. (2021). Shape and electromagnetic properties of the 229mTh isomer. EPJ Web of Conferences, 252: 02003. doi:10.1051/epjconf/202125202003.

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Minkov, Nikolay1, 2, Author           
Pálffy, Adriana2, 3, Author           
Affiliations:
1Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Tzarigrad Road 72, BG-1784 Sofia, Bulgaria, ou_persistent22              
2Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society, ou_904546              
3Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany, ou_persistent22              

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 MPINP: Research group A. Pálffy – Division C. H. Keitel
 Abstract: 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

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 Dates: 2021-09-10
 Publication Status: Published online
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 Identifiers: DOI: 10.1051/epjconf/202125202003
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Title: HINPw6 – Hellenic Institute of Nuclear Physics; 6th International Workshop; Perspectives on Nuclear Physics; From Fundamentals to Applications
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Title: EPJ Web of Conferences
Source Genre: Journal
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Publ. Info: Les Ulis : EDP Sciences
Pages: - Volume / Issue: 252 Sequence Number: 02003 Start / End Page: - Identifier: ISSN: 2100-014X
CoNE: https://pure.mpg.de/cone/journals/resource/2100-014X