Large Shape Staggering in Neutron-Deficient Bi Isotopes

A. Barzakh*, A. N. Andreyev, C. Raison, J. G. Cubiss, P. Van Duppen, S. Péru, S. Hilaire, S. Goriely, B. Andel, S. Antalic, M. Al Monthery, J. C. Berengut, J. Bieroń, M. L. Bissell, A. Borschevsky, K. Chrysalidis, T. E. Cocolios, T. Day Goodacre, J. P. Dognon, M. ElantkowskaE. Eliav, G. J. Farooq-Smith, D. V. Fedorov, V. N. Fedosseev, L. P. Gaffney, R. F. Garcia Ruiz, M. Godefroid, C. Granados, R. D. Harding, R. Heinke, M. Huyse, J. Karls, P. Larmonier, J. G. Li, K. M. Lynch, D. E. Maison, B. A. Marsh, P. Molkanov, P. Mosat, A. V. Oleynichenko, V. Panteleev, P. Pyykkö, M. L. Reitsma, K. Rezynkina, R. E. Rossel, S. Rothe, J. Ruczkowski, S. Schiffmann, C. Seiffert, M. D. Seliverstov, S. Sels, L. V. Skripnikov, M. Stryjczyk, D. Studer, M. Verlinde, S. Wilman, A. V. Zaitsevskii

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


The changes in the mean-square charge radius (relative to Bi209), magnetic dipole, and electric quadrupole moments of Bi187,188,189,191 were measured using the in-source resonance-ionization spectroscopy technique at ISOLDE (CERN). A large staggering in radii was found in Bi187,188,189g, manifested by a sharp radius increase for the ground state of Bi188 relative to the neighboring Bi187,189g. A large isomer shift was also observed for Bi188m. Both effects happen at the same neutron number, N=105, where the shape staggering and a similar isomer shift were observed in the mercury isotopes. Experimental results are reproduced by mean-field calculations where the ground or isomeric states were identified by the blocked quasiparticle configuration compatible with the observed spin, parity, and magnetic moment.

Original languageEnglish
Article numberA44
JournalPhysical Review Letters
Issue number19
StatePublished - 5 Nov 2021


FundersFunder number
BOF KU Leuven
Fonds Wetenschappelijk Onderzoek-VlaanderenO022818F
Slovak grant agency VEGA1/0651/21
Horizon 2020 Framework Programme654002, 771036
Science and Technology Facilities Council
European Research Council
National Natural Science Foundation of China11874090
Russian Foundation for Basic ResearchN 19-02-00005
Fonds De La Recherche Scientifique - FNRS
Belgian Federal Science Policy Office
Agentúra na Podporu Výskumu a VývojaAPVV-18-0268
Russian Science FoundationN 20-32-70177, 20-1-5-76-1, 21-1-2-47-1, 19-72-10019


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