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

Parr, E. ; Smith, J. F. ; Greenlees, P. T. ; Butler, P. A. ; Auranen, K. ; Chapman, R. ; Cox, D. M. LU ; Cullen, D. M. ; Gaffney, L. P. and Grahn, T. , et al. (2022) In Physical Review C 105(3).
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 =... (More)

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.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review C
volume
105
issue
3
article number
034303
publisher
American Physical Society
external identifiers
  • scopus:85126722252
ISSN
2469-9985
DOI
10.1103/PhysRevC.105.034303
language
English
LU publication?
yes
id
49cb9a66-97b9-4d24-a681-490a0a2e5a21
date added to LUP
2022-06-09 10:53:47
date last changed
2022-07-05 15:45:14
@article{49cb9a66-97b9-4d24-a681-490a0a2e5a21,
  abstract     = {{<p>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.</p>}},
  author       = {{Parr, E. and Smith, J. F. and Greenlees, P. T. and Butler, P. A. and Auranen, K. and Chapman, R. and Cox, D. M. and Cullen, D. M. and Gaffney, L. P. and Grahn, T. and Gregor, E. T. and Grocutt, L. and Herzáň, A. and Herzberg, R. D. and Hodge, D. and Jakobsson, U. and Julin, R. and Juutinen, S. and Keatings, J. M. and Konki, J. and Leino, M. and McKee, P. P. and McPeake, C. and Mengoni, D. and Mistry, A. K. and Singh, B. S.Nara and O'Neill, G. G. and Pakarinen, J. and Papadakis, P. and Partanen, J. and Peura, P. and Rahkila, P. and Ruotsalainen, P. and Sandzelius, M. and Sarén, J. and Scheck, M. and Scholey, C. and Siciliano, M. and Smolen, M. and Sorri, J. and Spagnoletti, P. and Spohr, K. M. and Stolze, S. and Taylor, M. J. and Uusitalo, J.}},
  issn         = {{2469-9985}},
  language     = {{eng}},
  number       = {{3}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review C}},
  title        = {{Single-particle states and parity doublets in odd- Z Ac 221 and Pa 225 from α -decay spectroscopy}},
  url          = {{http://dx.doi.org/10.1103/PhysRevC.105.034303}},
  doi          = {{10.1103/PhysRevC.105.034303}},
  volume       = {{105}},
  year         = {{2022}},
}