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

E. Parr; J. F. Smith; P. T. Greenlees; P. A. Butler; K. Auranen; R. Chapman; D. M. Cox; D. M. Cullen; L. P. Gaffney; T. Grahn; E. T. Gregor; L. Grocutt; A. Herzáň; R.-D. Herzberg; D. Hodge; U. Jakobsson; R. Julin; S. Juutinen; J. M. Keatings; J. Konki; M. Leino; P. P. McKee; C. McPeake; D. Mengoni; A. K. Mistry; B. S. Nara Singh; G. G. O'Neill; J. Pakarinen; P. Papadakis; J. Partanen; P. Peura; P. Rahkila; P. Ruotsalainen; M. Sandzelius; J. Sarén; M. Scheck; C. Scholey; M. Siciliano; M. Smolen; J. Sorri; P. Spagnoletti; K. M. Spohr; S. Stolze; M. J. Taylor; J. Uusitalo

doi:10.1103/PhysRevC.105.034303

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

E. Parr, J. F. Smith, P. T. Greenlees, P. A. Butler, K. Auranen, R. Chapman, D. M. Cox, D. M. Cullen, L. P. Gaffney, T. Grahn, E. T. Gregor, L. Grocutt, A. Herzáň, R.-D. Herzberg, D. Hodge, U. Jakobsson, R. Julin, S. Juutinen, J. M. Keatings, J. KonkiM. Leino, P. P. McKee, C. McPeake, D. Mengoni, A. K. Mistry, B. S. Nara Singh, G. G. O'Neill, J. Pakarinen, P. Papadakis, J. Partanen, P. Peura, P. Rahkila, P. Ruotsalainen, M. Sandzelius, J. Sarén, M. Scheck, C. Scholey, M. Siciliano, M. Smolen, J. Sorri, P. Spagnoletti, K. M. Spohr, S. Stolze, M. J. Taylor, J. Uusitalo

School of Computing, Engineering and Physical Sciences

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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 I^π =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.

Original language	English
Article number	034303
Journal	Physical Review C
Volume	105
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevC.105.034303
Publication status	Published - 2 Mar 2022

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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

@article{194b3301b81a45e6a3d6c8beff49aa16,

title = "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.",

author = "E. Parr and Smith, \{J. F.\} and Greenlees, \{P. T.\} and Butler, \{P. A.\} and K. Auranen and R. Chapman and Cox, \{D. M.\} and Cullen, \{D. M.\} and Gaffney, \{L. P.\} and T. Grahn and Gregor, \{E. T.\} and L. Grocutt and A. Herz{\'a}{\v n} and R.-D. Herzberg and D. Hodge and U. Jakobsson and R. Julin and S. Juutinen and Keatings, \{J. M.\} and J. Konki and M. Leino and McKee, \{P. P.\} and C. McPeake and D. Mengoni and Mistry, \{A. K.\} and Singh, \{B. S. Nara\} and O'Neill, \{G. G.\} and J. Pakarinen and P. Papadakis and J. Partanen and P. Peura and P. Rahkila and P. Ruotsalainen and M. Sandzelius and J. Sar{\'e}n and M. Scheck and C. Scholey and M. Siciliano and M. Smolen and J. Sorri and P. Spagnoletti and Spohr, \{K. M.\} and S. Stolze and Taylor, \{M. J.\} and J. Uusitalo",

year = "2022",

month = mar,

day = "2",

doi = "10.1103/PhysRevC.105.034303",

language = "English",

volume = "105",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

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Parr, E, Smith, JF, Greenlees, PT, Butler, PA, Auranen, K, Chapman, R, Cox, DM, Cullen, DM, Gaffney, LP, Grahn, T, Gregor, ET, Grocutt, L, Herzáň, A, Herzberg, R-D, Hodge, D, Jakobsson, U, Julin, R, Juutinen, S, Keatings, JM, Konki, J, Leino, M, McKee, PP, McPeake, C, Mengoni, D, Mistry, AK, Singh, BSN, O'Neill, GG, Pakarinen, J, Papadakis, P, Partanen, J, Peura, P, Rahkila, P, Ruotsalainen, P, Sandzelius, M, Sarén, J, Scheck, M, Scholey, C, Siciliano, M, Smolen, M, Sorri, J, Spagnoletti, P, Spohr, KM, Stolze, S, Taylor, MJ & Uusitalo, J 2022, 'Single-particle states and parity doublets in odd-Z ²²¹Ac and ²²⁵Pa from α-decay spectroscopy', Physical Review C, vol. 105, no. 3, 034303. https://doi.org/10.1103/PhysRevC.105.034303

TY - JOUR

T1 - Single-particle states and parity doublets in odd-Z 221Ac and 225Pa from α-decay spectroscopy

AU - Parr, E.

AU - Smith, J. F.

AU - Greenlees, P. T.

AU - Butler, P. A.

AU - Auranen, K.

AU - Chapman, R.

AU - Cox, D. M.

AU - Cullen, D. M.

AU - Gaffney, L. P.

AU - Grahn, T.

AU - Gregor, E. T.

AU - Grocutt, L.

AU - Herzáň, A.

AU - Herzberg, R.-D.

AU - Hodge, D.

AU - Jakobsson, U.

AU - Julin, R.

AU - Juutinen, S.

AU - Keatings, J. M.

AU - Konki, J.

AU - Leino, M.

AU - McKee, P. P.

AU - McPeake, C.

AU - Mengoni, D.

AU - Mistry, A. K.

AU - Singh, B. S. Nara

AU - O'Neill, G. G.

AU - Pakarinen, J.

AU - Papadakis, P.

AU - Partanen, J.

AU - Peura, P.

AU - Rahkila, P.

AU - Ruotsalainen, P.

AU - Sandzelius, M.

AU - Sarén, J.

AU - Scheck, M.

AU - Scholey, C.

AU - Siciliano, M.

AU - Smolen, M.

AU - Sorri, J.

AU - Spagnoletti, P.

AU - Spohr, K. M.

AU - Stolze, S.

AU - Taylor, M. J.

AU - Uusitalo, J.

PY - 2022/3/2

Y1 - 2022/3/2

N2 - 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.

AB - 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.

U2 - 10.1103/PhysRevC.105.034303

DO - 10.1103/PhysRevC.105.034303

M3 - Article

SN - 2469-9985

VL - 105

JO - Physical Review C

JF - Physical Review C

IS - 3

M1 - 034303

ER -

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

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