Th 229m isomer from a nuclear model perspective
Minkov N, Palffy-Buß A (2021)
Publication Type: Journal article
Publication year: 2021
Journal
Book Volume: 103
Article Number: 014313
Journal Issue: 1
DOI: 10.1103/PhysRevC.103.014313
Abstract
The physical conditions for the emergence of the extremely low-lying nuclear isomer Th229m at approximately 8 eV are investigated in the framework of our recently proposed nuclear structure model. Our theoretical approach explains the Th229m-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 behavior close to the line of isomer-ground-state quasidegeneracy 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.
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APA:
Minkov, N., & Palffy-Buß, A. (2021). Th 229m isomer from a nuclear model perspective. Physical Review C - Nuclear Physics, 103(1). https://dx.doi.org/10.1103/PhysRevC.103.014313
MLA:
Minkov, Nikolay, and Adriana Palffy-Buß. "Th 229m isomer from a nuclear model perspective." Physical Review C - Nuclear Physics 103.1 (2021).
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