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Large shape staggering in neutron-deficient Bi isotopes

A. Barzakh 1 A.  Andreyev 2, 3 C. Raison 2 J. 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. Berengut 8 J. Bieroń 9 M. Bissell 10 A. Borschevsky 11 K. Chrysalidis 12, 13 T. Cocolios 4 T. Day Goodacre 10, 12, 14 J.-P. Dognon 15 M. Elantkowska 16 E. Eliav 17 G. Farooq-Smith 4 D. Fedorov 1 V. Fedosseev 12 L. Gaffney 18 R. Garcia Ruiz 10 M. Godefroid 19 C. Granados 4, 12 R. Harding 2, 20 R. Heinke 13 M. Huyse 4 J. Karls 12, 21 P. Larmonier 12 J. Li 22 K. Lynch 12 D.  Maison 1, 23 B. Marsh 12 P. Molkanov 1 P. Mosat 7 A. Oleynichenko 1, 24 V. Panteleev 1 P. Pyykkö 25 M. Reitsma 11 K. Rezynkina 4 R.  Rossel 12 S. Rothe 12 J. Ruczkowski 16 S. Schiffmann 19 C. Seiffert 12 M. Seliverstov 1 S. Sels 4 L.  Skripnikov 1, 24 M. Stryjczyk 4, 26 D. Studer 13 M. Verlinde 4 S. Wilman 16 A.  Zaitsevskii 1, 24
5 LMCE - Laboratoire Matière sous Conditions Extrêmes
DAM/DIF - DAM Île-de-France, Université Paris-Saclay
15 LSDRM - Laboratoire Structure et Dynamique par Résonance Magnétique (LCF)
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
Abstract : 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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Submitted on : Wednesday, November 3, 2021 - 7:44:44 AM
Last modification on : Friday, November 5, 2021 - 4:14:30 AM

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A. Barzakh, A.  Andreyev, C. Raison, J. Cubiss, P. van Duppen, et al.. Large shape staggering in neutron-deficient Bi isotopes. Physical Review Letters, American Physical Society, 2021, 127 (19), pp.192501. ⟨10.1103/PhysRevLett.127.192501⟩. ⟨cea-03412363⟩

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