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Journal Articles Physical Review Letters Year : 2021

Large shape staggering in neutron-deficient Bi isotopes

J. C. Berengut
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E. Eliav
  • Function : Author


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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cea-03412363 , version 1 (03-11-2021)





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