A1 Journal article (refereed)
Single-particle states and parity doublets in odd-Z 221Ac and 225Pa from α-decay spectroscopy (2022)

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

JYU authors or editors

Publication details

All authors or editors: 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.; et al.

Journal or series: Physical Review C

ISSN: 2469-9985

eISSN: 2469-9993

Publication year: 2022

Publication date: 02/03/2022

Volume: 105

Issue number: 3

Article number: 034303

Publisher: American Physical Society (APS)

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevC.105.034303

Publication open access: Not open

Publication channel open access:

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/80652

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.

Keywords: nuclear physics

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2022

JUFO rating: 2