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Researchers measured nuclear properties of Bismuth isotopes. They discovered significant staggering in charge radii and isomer shifts at neutron number N=105, providing insights into nuclear structure.

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Area of Science:

  • Nuclear Physics
  • Atomic Physics

Background:

  • Nuclear structure studies are crucial for understanding atomic nuclei.
  • Isotopes of Bismuth (Bi) provide a unique region to study nuclear shape and properties.

Purpose of the Study:

  • To measure the mean-square charge radius, magnetic dipole, and electric quadrupole moments of Bismuth isotopes (187, 188, 189, 191).
  • To investigate the observed staggering in nuclear radii and isomer shifts at neutron number N=105.

Main Methods:

  • Utilized in-source resonance-ionization spectroscopy at ISOLDE (CERN).
  • Performed precise measurements of nuclear moments and charge radii for selected Bi isotopes.

Main Results:

  • Observed a significant staggering in the mean-square charge radii of 187, 188, 189Bi, with a notable increase for 188Bi.
  • Detected a large isomer shift in 188Bi, occurring at the same neutron number (N=105) as shape staggering in mercury isotopes.
  • Mean-field calculations successfully reproduced experimental results, identifying states by blocked quasiparticle configurations.

Conclusions:

  • The findings highlight a shape transition or deformation effects in this region of the nuclear chart.
  • The observed phenomena at N=105 suggest a common underlying nuclear structure mechanism across different isotopic chains.