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Charge radii and electromagnetic moments of Bi214−218: Exploring the “southern” border of the Z>82 octupole-deformation region

A. Barzakh1,*, A. N. Andreyev2,3,†, Z. Yue2, L. Nies4, M. D. Seliverstov1, J. G. Cubiss2,‡, A. Algora5,6, B. Andel7, S. Antalic7 et al.

M. Al Monthery8, D. Atanasov9,4, J. Benito10, G. Benzoni11, T. Berry12, M. L. Bissell13, K. Blaum9, M. J. G. Borge14, K. Chrysalidis4,15, C. Clisu16, T. E. Cocolios17, C. Costache16, T. Day Goodacre18,4,19, G. J. Farooq-Smith17,§, D. V. Fedorov1, V. N. Fedosseev4, L. M. Fraile10, H. O. U. Fynbo20, V. Gadelshin15, L. P. Gaffney21,∥, R. F. Garcia Ruiz19,¶, C. Granados4,17, P. T. Greenlees22, R. D. Harding2,4, L. J. Harkness-Brennan23, R. Heinke4,15,13, A. Herlert24, M. Huyse17, A. Illana25, J. Jolie26, D. S. Judson23, J. Karls4,27, J. Konki22, P. Larmonier4, I. Lazarus28, D. Leimbach4,27, R. Lică16, Z. Liu29,30, D. Lunney31, K. M. Lynch4,13, M. Madurga32, V. Manea4, N. Marginean16, R. Marginean16, B. A. Marsh4, C. Mihai16, P. Molkanov1, P. Mosat7, M. Mougeot4, J. R. Murias10, E. Nacher5, A. Negret16, D. Neidherr33, R. D. Page23, S. Pascu16, A. Perea14, V. Pucknell28, P. Rahkila22, C. Raison2, E. Rapisarda4, K. Rezynkina17, M. Rosenbush34,35, R. E. Rossel4, S. Rothe4, V. Sánchez-Tembleque10, K. Schomacker26, L. Schweikhard34, C. Seiffert4, S. Sels17,#, C. Sotty16, L. Stan16, M. Stryjczyk17,36, D. Studer15, J. Sundberg4,27, C. Sürder37, O. Tengblad14, P. Van Duppen17, V. Vedia10, M. Verlinde17, S. Viñals14, N. Warr26, A. Welker4,38, F. Wienholtz4,34,37, and R. N. Wolf9,34,39

  • *Contact author: barzakh_ae@pnpi.nrcki.ru
  • †Contact author: andrei.andreyev@york.ac.uk
  • ‡Present address: School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, United Kingdom.
  • §Present address: Department of Oncology Physics, Edinburgh Cancer Centre, Western General Hospital, Crewe Road South, Edinburgh EH4 2XU, United Kingdom.
  • ∥Present address: Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom.
  • Present address: Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
  • #Present address: CERN, 1211 Geneva 23, Switzerland.
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Phys. Rev. C 112, 034304 – Published 4 September, 2025

DOI: https://doi.org/10.1103/sltw-g4d6

Abstract

The changes in the mean-squared charge radii relative to Bi126209 (δ〈r2〉N,126) and the magnetic dipole and electric quadrupole moments in Bi214−218 have been measured using the in-source resonance-ionization spectroscopy technique at ISOLDE (CERN). Magnetic moments of odd-odd bismuth nuclei have been analyzed by the additivity relation. Previous tentative spin-parity and configuration assignments based on the β-decay feeding patterns have been supported. A normal odd-even staggering in charge radii of bismuth isotopes with N>126 has been observed. The new data for the δ〈r2〉 of bismuth isotopes allow a study of the isotonic dependencies in the charge radii, revealing jumps in δ〈r2〉132,126 and δ〈r2〉134,126 at Z=84. This pattern could be explained by a sudden onset of octupole deformation at N=132 and 134 when going from polonium (Z=84) to astatine (Z=85).

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Phys. Rev. C 112, 034304– Published 4 September, 2025
  • Received 1 July 2025
  • Accepted 1 August 2025
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