Large shape staggering in neutron-deficient Bi isotopes
2 Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
3 Advanced Science Research Center and Nuclear Science Research Institute, Japan Atomic Energy Agency
4 KU Leuven - Catholic University of Leuven = Katholieke Universiteit Leuven
5 LMCE - Laboratoire Matière sous Conditions Extrêmes
6 IAA - Institut d'Astronomie et d'Astrophysique [Bruxelles]
7 Univerzita Komenského = Comenius University [Bratislava]
8 School of Physics
9 Instytut Fizyki Teoretycznej
10 School of Physics and Astronomy [Manchester]
11 Van Swinderen Institute
12 CERN - European Organization for Nuclear Research
13 Institut für Physik Johannes Gutenberg Universität
14 TRIUMF [Vancouver]
15 LSDRM - Laboratoire Structure et Dynamique par Résonance Magnétique (LCF)
16 PUT - Poznan University of Technology
17 School of Chemistry
18 https://www.uwl.ac.uk/academic-schools/computing - School of Computing and Engineering [London]
19 SQUARES - Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing
20 CERC - CERC - Centre d'Études et de Recherches Comparatistes - EA 172
21 Department of Physics [Gothenburg]
22 IAPCM - Institute of Applied Physics and Computational Mathematics [Beijing]
23 SPBU - Saint Petersburg State University
24 Department of Chemistry [Moscow]
25 Department of Chemistry [Helsinki]
26 JYU - University of Jyväskylä
Résumé
The changes in the mean-square charge radius (relative to $^{209}$Bi), magnetic dipole, and electric quadrupole moments of $^{187;188;189;191}$Bi were measured using the in-source resonance-ionization spectroscopy technique at ISOLDE (CERN). A large staggering in radii was found in $^{187;188;189}$Bi$^g$ , manifested by a sharp radius increase for the ground state of $^{188}$Bi relative to the neighboring $^{187;189}$Bi$^g$. A large isomer shift was also observed for $^{188}$Bi$^m$. 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.
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