Large shape staggering in neutron-deficient Bi isotopes
A. Barzakh
(1)
,
A. N. Andreyev
(2, 3)
,
C. Raison
(2)
,
J. G Cubiss
(2)
,
P. van Duppen
(4)
,
S. Péru
(5)
,
S. Hilaire
(5)
,
S. Goriely
(6)
,
B. Andel
(7)
,
S. Antalic
(7)
,
M. Al Monthery
(2)
,
J. C. Berengut
(8)
,
J. Bieroń
(9)
,
M. L. Bissell
(10)
,
A. Borschevsky
(11)
,
K. Chrysalidis
(12, 13)
,
T. E. Cocolios
(4)
,
T. Day Goodacre
(10, 12, 14)
,
J.-P. Dognon
(15)
,
M. Elantkowska
(16)
,
E. Eliav
(17)
,
G. J. Farooq-Smith
(4)
,
D. V. Fedorov
(1)
,
V. N. Fedosseev
(12)
,
L. P. Gaffney
(18)
,
R. F. Garcia Ruiz
(10)
,
M. Godefroid
(19)
,
C. Granados
(4, 12)
,
R. D. Harding
(2, 20)
,
R. Heinke
(13)
,
M. Huyse
(4)
,
J. Karls
(12, 21)
,
P. Larmonier
(12)
,
J. G. Li
(22)
,
K. M. Lynch
(12)
,
D. E. Maison
(1, 23)
,
B. A. Marsh
(12)
,
P. Molkanov
(1)
,
P. Mosat
(7)
,
A. V. Oleynichenko
(1, 24)
,
V. Panteleev
(1)
,
P. Pyykkö
(25)
,
M. L. Reitsma
(11)
,
K. Rezynkina
(4)
,
R. E. Rossel
(12)
,
S. Rothe
(12)
,
J. Ruczkowski
(16)
,
S. Schiffmann
(19)
,
C. Seiffert
(12)
,
M. D. Seliverstov
(1)
,
S. Sels
(4)
,
L. V. Skripnikov
(1, 24)
,
M. Stryjczyk
(4, 26)
,
D. Studer
(13)
,
M. Verlinde
(4)
,
S. Wilman
(16)
,
A. V. Zaitsevskii
(1, 24)
1
National Research Centre “Kurchatov Institute”: Petersburg Nuclear Physics Institute
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 Comenius University in 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, Lomonosov Moscow State University
25 Department of Chemistry [Helsinki]
26 JYU - University of Jyväskylä
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 Comenius University in 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, Lomonosov Moscow State University
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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