Single-particle states and parity doublets in odd-Z Ac-221 and Pa-225 from alpha-decay spectroscopy



Parr, E, Smith, JF, Greenlees, PT, Butler, PA, Auranen, K, Chapman, R, Cox, DM, Cullen, DM, Gaffney, LP, Grahn, T
et al (show 35 more authors) (2022) Single-particle states and parity doublets in odd-Z Ac-221 and Pa-225 from alpha-decay spectroscopy. PHYSICAL REVIEW C, 105 (3). 034303-.

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Abstract

Low-lying states in the odd-Z isotopes Ac13289221 and Pa13491225 have been studied using α-particle and αγ-coincidence spectroscopy in the Pa225→Ac221→Fr217 decay chain. Ground-state spin and parity assignments of Iπ = 5/2- are proposed for both Ac221 and Pa225, with the odd proton occupying the ω = 5/2 orbital of the quadrupole-octupole deformed shell model in both nuclei. In Ac221, 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.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5110 Synchrotrons and Accelerators, 51 Physical Sciences
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 30 Aug 2022 09:17
Last Modified: 21 Jun 2024 03:36
DOI: 10.1103/PhysRevC.105.034303
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3162807