Single-particle states and parity doublets in odd-Z 221Ac and 225Pa from α-decay spectroscopy
Abstract
Low-lying states in the odd-Z isotopes 22189Ac132 and 22591Pa134 have been studied using α-particle and αγ-coincidence spectroscopy in the 225Pa→221Ac→217Fr decay chain. Ground-state spin and parity assignments of Iπ = 5/2− are proposed for both 221Ac and 225Pa, with the odd proton occupying the Ω = 5/2 orbital of the quadrupole-octupole deformed shell model in both nuclei. In 221Ac, excited states in the bands based on the Ω = 5/2 and Ω = 3/2 orbitals have been identified, including proposed parity-doublet states. The results suggest that reflection-asymmetric deformation of the ground state persists in the odd-A members of the isotope chains down to N = 132 for Ac and N = 134 for Pa, before reaching the transitional region at N = 130.
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Format
Articles
Research article
Published
2022
Series
Subjects
Publication in research information system
Publisher
American Physical Society (APS)
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-202204202334Use this for linking
Review status
Peer reviewed
ISSN
2469-9985
DOI
https://doi.org/10.1103/PhysRevC.105.034303
Language
English
Published in
Physical Review C
Citation
- Parr, E., Smith, J. F., Greenlees, P. T., Butler, P. A., Auranen, K., Chapman, R., Cox, D. M., Cullen, D. M., Gaffney, L. P., Grahn, T., Gregor, E. T., Grocutt, L., Herzáň, A., Herzberg, R.-D., Hodge, D., Jakobsson, U., Julin, R., Juutinen, S., Keatings, J. M., . . . Uusitalo, J. (2022). Single-particle states and parity doublets in odd-Z 221Ac and 225Pa from α-decay spectroscopy. Physical Review C, 105(3), Article 034303. https://doi.org/10.1103/PhysRevC.105.034303
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Additional information about funding
This work is supported in part by the following bodies: STFC (UK) under Grants No. ST/L005808/1 and No. ST/P005101/1 (UWS); the EU 7th Framework Programme, Integrating Activities Transnational Access, Project No. 262010 (ENSAR); the Academy of Finland under the Finnish Centre of Excellence Programme (Nuclear and Accelerator Based Physics Programme at JYFL); the Scottish Universities Physics Alliance, Glasgow, United Kingdom (SUPA); the Slovak Research and Development Agency under Contract No. APVV-20-0532; the Slovak grant agency VEGA (Contract No. 2/0067/21); and the project ITMS code 26210120023, supported by the Research and Development Operational Programme funded by ERDF. The authors would also like to acknowledge GAMMAPOOL support for the JUROGAM HPGe detectors.
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